4. Why cannot a dry seed germinate?

Answer:  A) Structural adaptation of seeds:

1. Sticky and feathery nature.

2. Float in water

3. Survive adverse conditions.

B) Economic and Biological importance of seeds:

1.  Rich in proteins, starch and oil reserves.

2. Used as a raw material in industries.

Explanation: A) Structural adaptation of seeds are as follows :

1. Stamens are sticky and feathery for those seeds in which pollination is done by air

2.Water pollinating seeds have hyaluronic layer that do not allows them to get wet in water and their light weight provides them strength to float in water.

3. Some seeds develop sporopollenin layer. which provides them strength to survive the adverse conditions.

B) Economic and Biological importance of seeds are as follows :

1. Some seed contains higher amount of protein content, starch content, oil reserves. which helps in the growth of the growing plants.

2. Seeds are also used in food and chemical industries as raw materials.

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Answer: True

Explanation: This is homeostasis basically changing for adaptation.

Homozygotes are people having the genotypes AA and aa (i.e., they have two copies of the same allele). Those who have the genotype Aa are heterozygotes (i.e., they have two different alleles at the A locus).

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Answer:

blank 1 - sensation

blank 2 - perception

Explanation:

Bogs:

Swamps and marshes:

Streams:

Marine:

Estuaries:

[tex] \: [/tex]

The right response is d) early in development, when cells only have active copies of the paternal X chromosome and all maternal X chromosomes are inactivated.

One of the two X chromosomes is inactivated during the early stages of embryonic development, a process known as X-inactivation that affects female animals. This procedure makes sure that the proportion of X-linked genes in males and females is equal. In humans and the majority of other animals, X-inactivation starts early in development, with cells keeping only active copies of the paternal X chromosome and inactivating all maternal X chromosomes. The X-inactive specific transcript (XIST) gene, when expressed, wraps the maternal X chromosome in RNA, inactivating it. This achieves the desired result. The disruption of X-inactivation, a critical process for guaranteeing appropriate gene dosage in females, can result in illnesses and developmental problems.

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The key effect of the drugs that treat Polycythemia Vera (PV) is the process of DNA transcription. Option B

Polycythemia Vera (PV) is a myeloproliferative disorder characterized by the overproduction of red blood cells, white blood cells, and platelets. The primary target of PV drugs is to reduce the production of these cells and prevent complications such as blood clots, which can cause stroke, heart attack, and other serious problems.

The most commonly used drugs for the treatment of PV are hydroxyurea and interferon alpha. Hydroxyurea works by inhibiting DNA transcription.

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Answer:

Explanation:

The nucleotide sequence of a gene can be very different from the nucleotide sequence of an entirely different gene. Each gene has a unique sequence of nucleotides that determines the specific instructions for making a particular protein or RNA molecule. The sequence of nucleotides in a gene determines the order of amino acids in the protein or the sequence of bases in the RNA molecule. This sequence of nucleotides can vary widely between different genes, even within the same organism. However, there may also be similarities or conserved regions between genes that encode similar proteins or have similar functions, indicating a shared evolutionary history. In general, the nucleotide sequence of a gene is specific to that gene and is distinct from the nucleotide sequence of any other gene.

The statement "Food deserts are often found in low-income areas that lack traditional grocery stores" is true.'

Food deserts are areas where people have limited access to affordable and nutritious food, especially fresh fruits and vegetables. This often occurs in low-income areas where there are no grocery stores or other food retailers that offer healthy food options.

Food deserts can be found in both urban and rural areas, and access to public transportation may not necessarily solve the issue. Low-income residents in rural areas may face additional obstacles in accessing healthy food options, such as transportation and distance to grocery stores.

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Answer:

Farmers cannot save GM seeds from one year to the next because the seeds are patented and must be bought each year. The companies that create and sell GM seeds retain the intellectual property rights to those seeds, and farmers who use them must sign a contract agreeing not to save the seeds for replanting in future years. This ensures that the companies are compensated for their research and development costs and that farmers have access to the latest and most effective seed varieties.

The tree grew 74 kg, although the soil did not change considerably over the course of five years, indicating that the tree's bulk was not solely derived from the soil. The soil would have lost a comparable amount of mass if the tree had gained all of its weight from the soil, but this did not happen. This information thus implies that a tree's bulk is not exclusively derived from the earth.

After his experiment, Van Helmont came to the conclusion that the soil weight remained constant after five years and that the willow tree had acquired weight due to the daily addition of water. He was mistaken since CO2 in addition to water provided the willow tree with nutrition and energy.

He thus conducted an experiment in which he used a container of soil and a willow seedling, weighing each individually. He then placed the willow tree in direct sunshine and gave it daily watering.

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The brown version of the eye color gene (B) is dominant over the blue version (b). Dominant means that if either of your genes is the B version, then you will have brown eyes. Genetically speaking, then, people with brown eyes could be either BB or Bb while people with blue eyes could only be bb.

The correct answer is D. Enlargement of a cervical lymph node to 1 cm in diameter if the diagnosis is otherwise uncertain is a common indication for biopsy. Biopsy is done to obtain tissue samples for examination under a microscope to determine the cause of the lymph node enlargement, such as infection, inflammation, or cancer.

Option A may require incision and drainage rather than a biopsy, and option B is not a common indication for lymph node biopsy. Option C and E are not specific indications for biopsy and do not necessarily require biopsy.

Based on his pea-plant data, Mendel reached the following three conclusions:

A. The alleles for a particular gene are inherited independently of each other.

B. Parents pass some kind of factor to their offspring during reproduction.

D. Dominant alleles mask recessive alleles.

Mendel did not know about DNA, as it had not yet been discovered. Instead, he referred to the "factors" that were passed down from parents to offspring. Later, scientists discovered that these factors are genes made up of DNA.

What is DNA?

DNA (Deoxyribonucleic Acid) is a molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all living organisms and many viruses. DNA consists of a long chain of nucleotides, which are the building blocks of the molecule. Each nucleotide is made up of a sugar molecule (deoxyribose), a phosphate group, and a nitrogenous base.

The four types of nitrogenous bases found in DNA are adenine (A), thymine (T), cytosine (C), and guanine (G). The sequence of these bases along the DNA chain forms a genetic code that is responsible for the traits and characteristics of an organism. DNA is found in the nucleus of eukaryotic cells and in the cytoplasm of prokaryotic cells.

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Answer:

86 leg power, 20 words long

We have the following categories, going from the largest and most inclusive to the smallest and most exclusive: Biosphere, Biome, Ecosystem, Community Population, and the individual creature itself.

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Fish sewage/waste that runs out of fish pens designed to raise a single species of fish might harm the ecological  by potentially creating hypoxia.

Large or heavy fishing equipment might harm the environment when catching fish. Dredging and bottom trawling are two fishing practices that have an impact on the habitat of the seafloor. Fishing gear can cause long-term harm in regions where delicate, bottom-living organisms, such deep-sea corals, exist.

Many factors that affect aquaculture's interaction with the environment can be divided into two categories: the products produced and consumed by the aquaculture technique or the culture organism, and the effects those products have on the surrounding physical and biological environment.

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To prevent the crime scene from being tampered with and the evidence from being lost, we should leave any area where a robber may have been after a robbery.

Immediately dial the police. Tell them right away if someone is hurt so they can send out the emergency services. Provide police with the robber's departure time, description, and mode of transportation. Till they give you the all-clear to end the call, hang in there.

Keep your eyes and ears out for anybody around. Know who is walking in front of you and behind you. People or cars that seem suspicious, people who are dressed improperly for the weather, and loiterers are all things to be on the lookout for.

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(a) Sunlight, (b) photosynthesis, (c) chloroplasts, (d) sugar, (e) chlorophyll, (f) carbon dioxide, (g) cellular respiration, (h) mitochondria

Photosynthesis is the process by which green plants and other organisms use sunlight, carbon dioxide, and water to produce oxygen and glucose (a type of sugar). This process is essential for the survival of plants and other organisms that depend on them for food and oxygen.

It is a process by which plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose. This process takes place in chloroplasts, which are organelles found in plant cells. The energy from sunlight is used to split water molecules into oxygen and hydrogen ions. The hydrogen ions are used to produce ATP, which is a type of energy currency for cells.

Carbon dioxide from the air is also taken up by the plant and used to create glucose through a series of chemical reactions. Glucose is then used by the plant for energy or stored as starch. In summary, photosynthesis is a complex process that enables plants to create their own food and is essential for life on earth.

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Answer:

Semiconservative; old

Explanation:

When DNA is replicated, one original parent strand is kept as a template, while a new one is formed by using the original parent strand as a template. This yields one new parent strand, and one new "daughter" strand that is complementary. This is known as the semi-conservative model of DNA replication.

Note: DNA cannot be replicated from thin air. A template of some sort has to be used, and it is always from a parent strand. This ensures very minimally, if at all, errors in DNA replication such as mutations.

The molecules remain the same in these processes, and the substance retains its chemical properties. Chemical and physical changes are two fundamental types of changes that occur in matter.

Physical changes refer to changes in the physical properties of a substance, such as its shape, size, or state of matter, without altering its chemical composition. On the other hand, chemical changes involve a rearrangement of atoms or molecules that results in the formation of new chemical substances with new chemical properties.

Physical changes are usually reversible, and the substance retains its identity before and after the change. For example, melting, freezing, boiling, evaporation, and condensation are all examples of physical changes. The molecules remain the same in these processes, and the substance retains its chemical properties.

Chemical changes, on the other hand, are usually irreversible, and the substance undergoes a transformation into a new substance with different chemical properties. Examples of chemical changes include rusting of iron, burning of wood, digestion of food, and fermentation of grapes into wine.

In summary, physical changes affect the physical properties of a substance without changing its chemical composition, while chemical changes result in the formation of new chemical substances with different chemical properties.

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Heirloom crop varieties are important because they can have genetic raw material that allows crops to respond to changes.

Heirloom crop varieties are traditional crop varieties that have been grown and saved by farmers for generations, often without the use of modern agricultural techniques.

Heirloom crop varieties can have genetic diversity that allows them to respond to changes in their environment, such as changes in climate, pests, and diseases. They may also have traits that make them more adapted to specific growing conditions, such as drought or poor soil quality.

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Answer: Key points:

Producers, or autotrophs, make their own organic molecules. Consumers, or heterotrophs, get organic molecules by eating other organisms.

A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another.

In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from the basic input of the chain.

Food webs consist of many interconnected food chains and are more realistic representation of consumption relationships in ecosystems.

Energy transfer between trophic levels is inefficient—with a typical efficiency around 10%. This inefficiency limits the length of food chains.

Introduction

Organisms of different species can interact in many ways. They can compete, or they can be symbionts—longterm partners with a close association. Or, of course, they can do what we so often see in nature programs: one of them can eat the other—chomp! That is, they can form one of the links in a food chain.

In ecology, a food chain is a series of organisms that eat one another so that energy and nutrients flow from one to the next. For example, if you had a hamburger for lunch, you might be part of a food chain that looks like this: grass

→

→right arrow cow

→

→right arrow human. But what if you had lettuce on your hamburger? In that case, you're also part of a food chain that looks like this: lettuce

→

→right arrow human.

As this example illustrates, we can't always fully describe what an organism—such as a human—eats with one linear pathway. For situations like the one above, we may want to use a food web that consists of many intersecting food chains and represents the different things an organism can eat and be eaten by.

In this article, we'll take a closer look at food chains and food webs to see how they represent the flow of energy and nutrients through ecosystems.

Autotrophs vs. heterotrophs

What basic strategies do organisms use to get food? Some organisms, called autotrophs, also known as self-feeders, can make their own food—that is, their own organic compounds—out of simple molecules like carbon dioxide. There are two basic types of autotrophs:

Photoautotrophs, such as plants, use energy from sunlight to make organic compounds—sugars—out of carbon dioxide in photosynthesis. Other examples of photoautotrophs include algae and cyanobacteria.

Chemoautotrophs use energy from chemicals to build organic compounds out of carbon dioxide or similar molecules. This is called chemosynthesis. For instance, there are hydrogen sulfide-oxidizing chemoautotrophic bacteria found in undersea vent communities where no light can reach.

Autotrophs are the foundation of every ecosystem on the planet. That may sound dramatic, but it's no exaggeration! Autotrophs form the base of food chains and food webs, and the energy they capture from light or chemicals sustains all the other organisms in the community. When we're talking about their role in food chains, we can call autotrophs producers.

Answer:

1. A (Model)

2. B (Ecosystem)

3. C (Plants and animals)

4. C (Environment)

5. A (Primary producer)

6. A (Abiotic sources)

7. B (Sun)

8. A (Plants)

9. A (Sun)

10. A (photosynthesis)

11. C (water)

12. A (Sun)

13. A (Cellular respiration)

14. A (Glucose)

15. B (Consumer)

16. A (energy)

17. A (Primary producer)

18. B (Consumers)

19. C (Decomposers)

20. A (Decompose)

21. A (nutrients)

22. A (Trophic level)

23. A (Primary consumers)

24. A (secondary producers)

25. B (consumers)

26. A(energy)

27. A (100 %)

28. C (10 %)

29. B (10%)

Explanation:

Answer:

In Ambrose Flack's short story "The Strangers That Came to Town," the plot revolves around the Duvitch family, who are immigrants trying to assimilate into a new community that is initially unwelcoming. The main conflict arises from the clash between the Duvitch family, led by the protagonist Mr. Duvitch, and the prejudiced townspeople, with Tom Corey being the primary antagonist. Mr. Duvitch's perspective on the conflict is that his family deserves to be treated with respect and dignity, regardless of their background or financial status. In a conversation with his son, he says, "We must be patient, my boy, and show them we are good people." On the other hand, Tom Corey, representing the antagonist's perspective, sees the Duvitches as a threat to the community's established order and is unwilling to accept them. He scoffs, "These foreigners have no business coming to our town." Ultimately, the story reveals that both the protagonist and antagonist must confront their own biases and prejudices, as they each learn valuable lessons about empathy, acceptance, and the human experience.

Utilizing fertilizers on crops has the advantage of increasing food production.

In order to grow crops that will yield enough food to feed the world's population, fertilizer is added. Fertilizers give plants the nutrients potassium, phosphorus, and nitrogen so they can grow larger, more quickly, and generate more food.

By giving the soil the proper mix of nutrients, fertilizers play the role of increasing output and ensuring healthy food. "Without fertilizers, the soil would become depleted, making plant cultivation extremely difficult. They cannot survive on water alone, and neither can we.

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Given figure represents ulna bone of forearm.

The ulna bone is one of the two long bones located in the forearm, the other being the radius bone. The ulna is situated on the medial side of the forearm and is slightly longer than the radius. The bone extends from the elbow joint to the wrist joint, where it articulates with the radius and several carpal bones to form the wrist joint.

The ulna bone is composed of several distinctive features, including:

1. Olecranon: The olecranon is a bony prominence located at the proximal end of the ulna bone that serves as the attachment site for several muscles in the arm.

Trochlear notch: The trochlear notch is a U-shaped depression on the distal end of the ulna bone that articulates with the trochlea of the humerus to form the elbow joint.

3. Styloid process: The styloid process is a bony projection located on the distal end of the ulna bone that serves as the attachment site for ligaments that connect the bone to the wrist joint.

4. Interosseous membrane: The interosseous membrane is a fibrous membrane that connects the ulna and radius bones and helps to transmit forces between the bones during movements of the forearm.

The ulna bone plays an important role in the stability and movement of the forearm and wrist joints, and it is essential for the performance of many everyday activities.

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Complete question -

Answer:

As a nanobot the size of a red blood cell, I would have a very unique perspective on the human body. My first stop would be the heart, where I would witness the powerful pumping action that propels me and my fellow red blood cells through the blood vessels. As I travel through the arteries and veins, I would encounter a variety of different tissues and organs, each with their own specialized functions.

In the lungs, I would see the exchange of oxygen and carbon dioxide that occurs during respiration. I would also pass through the kidneys, where I would observe the filtration and removal of waste products from the blood. In the liver, I would witness the breakdown of toxins and the production of bile to aid in digestion.

As I continue my journey through the circulatory system, I would encounter the immune system in action, as white blood cells attack invading pathogens. I would also pass through the brain, where I would see the intricate network of blood vessels that supply oxygen and nutrients to this vital organ.

In my travels, I may encounter other nanobots like myself, programmed to perform specific tasks like repairing damaged tissues or delivering drugs to targeted areas of the body. It would be a fascinating and endlessly varied journey, full of wonders and challenges. But as a nanobot, my primary goal would always be to contribute to the health and wellbeing of the human host that I am privileged to serve.

Explanation:

Your lips or nose could let tiny airborne particles into your lungs. Air quality issues are caused by airborne particles, which include haze, smoke, and airborne dust.

Breathing in microscopic particles puts those who have asthma at more risk. Asthma symptoms may worsen as a result of the particles.

More than 23 million Americans suffer from asthma, a dangerous and potentially fatal chronic respiratory condition, which is connected to air pollution. Air pollution can exacerbate asthma symptoms and precipitate asthma episodes.

In order to lessen the health burden associated with the disease, EPA conducts research on the relationship between air pollution and asthma.

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When plants reproduce through vegetative propagation (such as through stem cuttings), the genetic makeup of the offspring plants will be identical to the parent plant that provided the stem pieces.

This is because the offspring plants are essentially clones of the parent plant and inherit all of their genetic material from the parent plant.

In contrast, when plants reproduce sexually (through seeds), the genetic makeup of the offspring plants will be different from that of the parent plants. This is because sexual reproduction involves the fusion of gametes from two different parent plants, resulting in a new combination of genetic material in the offspring.

Therefore, when using vegetative propagation, the genetic makeup of the offspring plants will be identical to that of the parent plant, whereas sexual reproduction can result in offspring with different genetic makeup from the parents.

What is vegetative propagation?

Vegetative propagation is a type of asexual reproduction in plants in which a new plant is produced from vegetative parts of the parent plant, such as stems, roots, and leaves, without the involvement of seeds or spores. In this process, the new plant that is produced is genetically identical to the parent plant, which means that the offspring is a clone of the parent. vegetative propagation can occur naturally or through human intervention.

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