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Posted in Biology

How do plant populations in a community change over time?


Plant populations in a community can change over time. This is also known as Evolution or Succession. Communities of plants are established and then change over time as the external environment in which they live changes. The external environment can change in the following ways: 1.    Climate changes: e.g. drought conditions, floods and global warming. 2.    Increase or decrease in animal and human population e.g. some plants are eaten by herbivorous animals and people. 3.    Ecological Disasters affect the growth of plants in a community. For example, the Wild Flower population in the Western Cape region of South Africa regenerates itself through fire. If wildfires do not occur, the wildflower population dies out. On the other hand fire also destroys large forested areas and the plants take a while to regrow, if ever. This is just a small sample of how plant populations change over time. 

Related Questions

Posted in Biology

Which produces the sediments that ultimately lead to soil formation? A. rivers B. plants C. weathering D. rainfall

I think the correct answer from the choices listed above is option C. It is weathering that  produces the sediments that ultimately lead to soil formation. Weathering is the breaking down of rocks, soil, and minerals as well as wood and artificial materials through contact with the Earth's atmosphere, waters, and biological organisms.

Posted in Biology

The slowest type of mass movement, which involves the lifting and contracting of soil particles over time, is called a.) a rockslide b.) an earthquake c.) creep d.) rockfall

HI there

i believe the answer is creep creep takes a long time to do its job so i believe this is your answer

hope this helped you!

Posted in Biology

What dose the cell wall provide the plant cell with

The plant cell wall is composed of "cellulose", which only provided by it.

Hope this helps!

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Posted in Biology

What structure takes up the majority of the center space within the plant cells

The central vacuole in a plant cell takes up most of the space. The vacuole stores wastes and nutrients, and also provides support and structure for the cell.

Posted in Biology

A snake that eats a frog that has eaten an insect that fed on a plant is

A snake that eats a frog that has eaten an insect that fed on a plant is a FOOD CHAIN

Posted in Biology

In organisms other than plants, when and where is the most ATP produced? in thylakoids, during photosynthesis in nuclei, during cellular respiration in chloroplasts, during photosynthesis in mitochondria, during cellular respiration

Answer: In the mitochondria during the process of cellular respiration.

Explanation:

The food that we intake is in the form of either carbohydrate, fat and proteins. The food needs to be converted in the form of adenosine triphosphate which is used by the cells of the body.

The process of cellular respiration takes place in the mitochondria which is the site for the formation of ATP.

The cellular respiration is the process by which there is a conversion of carbohydrates into ATP.

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Posted in Biology

How do plants get nitrogen? by carrying out photosynthesis by absorbing it from soil by carrying out nitrogen fixation or by absorbing it through evaporation

Answer: by absorbing it from soil

Explanation:

Nitrogen is an essential element required by the plants for their growth and metabolism that is for the synthesis of amino acids, proteins, and nucleic acids. The nitrogen is present in the earth atmosphere for about 78%. The plants cannot directly absorb atmospheric nitrogen instead they are capable of absorbing and utilizing the compounds of nitrogen such as ammonia, nitrates and nitrites. The atmospheric nitrogen is absorbed and fix in the soil by soil bacteria into compounds of nitrogen which can be easily absorbed by the plant roots from the soil.

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Posted in Biology

The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance lose energy during a change of state. Before the change, the atoms are close together but are able to slide past one another. Which arrow represents the change of state described above? M- gas to solid N-liquid to gas P-solid to liquid Q-liquid to solid

The correct option is this: Q - LIQUID TO SOLID.

Looking at the information given above, we are told that, before the change, the atoms are close together but are able to slide past one another. This is one of the characteristics of liquids, the particle in liquids are held together by inter molecular forces but they are still able to slide past one another. So, this tell us that, the substance was originally in the liquid state.

We are also told that, the atoms of the substance lose energy during the change of state. If there is a loss of energy, it means that, the little energy that the particles had before, which they were using to slide past one another is now removed and the particles becomes more compact. This implies that, the substance changes to solid. If the substance change to gas, there would have been gain of energy not loss. Therefore, the correction option is D. The substance change from liquid state to solid state.

Posted in Biology

Jane supplied plenty of water, minerals, sunlight, and carbon dioxide for her plant. But the plant still didn't do well. What might be the reason? It may be too hot or cold for the plant. The plant doesn't need water. The plant doesn't need carbon dioxide.

Answer: The plant doesn't need carbon dioxide.

Explanation: The green plants needs oxygen, water, minerals and sunlight for its growth, we need not to supply carbon dioxide from the external source.

In the pressence of additional carbon dioxide there are chances that the plant will die. There is no need for the plants to be supplied with carbon dioxide, they obtain it from the various reactions that takes place inside the plant.

Example: cellular respiration.

Posted in Biology

How does root hairs help plants absorb water

The water droplets stick to the tiny hairs so it hold onto them. Since there are a lot of hairs, they collect more water.

Posted in Biology

What would cause this change in water temperature, and how will this change most likely affect species distribution?

Think of gold fish that you get from the fair.. why cant we put them in water from the drain right away? because it kills them. so the water changing can hurt the species because its a change in habitat 

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Posted in Biology

Unlike plant cell animal cell contain

Unlike plant cell animal cell contain  "Centrioles"

Hope this helps!

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Posted in Biology

During the winter time, the total number of hours of sunlight decreases. What effect would this have on the process of photosynthesis? A) The rate of photosynthesis would decrease and less glucose would be produced. B) The rate of photosynthesis would increase and more glucose would be produced. C) The amount of available sunlight does not influence the rate of photosynthesis. D) It would have no effect on plants having needles instead of leaves, that stay green all year long.

Answer: A) The rate of photosynthesis would decrease and less glucose would be produced.

Explanation: Photosynthesis is a phenomenon in which green plants containing chlorophyll use sunlight as a source of energy to convert carbon dioxide and water to form glucose and oxygen.

Photosynthesis is the process used by plants, algae and certain bacteria to convert energy from sunlight and turn it into chemical energy in the form of glucose which is used a s a source of energy by many organisms.

6CO_2+6H_2O\overset{sunlight}\rightarrow C_6H_{12}O_6+6O_2

Thus decreasing the amount of sunlight would decrease the rate of photosynthesis and less glucose will be produced.

Posted in Biology

. Carbon-14 is used to determine the time an organism was living. The amount of carbon-14 an organism has is constant with the atmosphere, but when an organism dies the carbon-14 decays at a half-life of 5,730 years. If an archeologist measured the amount of carbon-14 in an organism and it was 25% of the total amount of atmospheric C-14, what is the age of the organism?

The answer is 11460 years

Half-life (x) is the time period (t) divided by the number of half-lives (n):
x = t/n

The number of half-lives (n) can be calculated by using the formula:
(1/2)ⁿ = a
where a is decimal amount remaining

We have:
x = 5,730 years
a = 25% = 25/100 = 0.25
n = ?
t = ?

(1/2)ⁿ = a
(0.5)ⁿ = 0.25
(0.5)ⁿ = (0.5)²
n = 2

x = t/n
t = x * n
t = 5730 * 2
t = 11460 years

Posted in Biology

Angelina observes that her gardener cuts the tips of her ornamental plants at regular intervals of about 10–15 days. When she asks him why he does this, he tells her that this allows the tree to grow faster and bushier. How would you explain this scientifically?


Cutting the tips of the plant stops the secretion of Auxins, which are present in the apical meristems. This stimulates the growth of the axillary and lateral buds, causing the plant to branch out.

Posted in Biology

Which of the following is not true concerning the flow of energy through an ecosystem? a. Most solar energy is used in photosynthesis. b. Photosynthesis and cellular respiration are performed by plants. c. Not all solar energy is used for photosynthesis. d. Most of the energy from photosynthesis flows out as heat.

Answer;

D. Most of the energy from photosynthesis flows out as heat

Explanation;

Energy flow is the amount of energy that moves through a food chain in a given ecosystem.

Producers such as green plants in a ecosystem convert energy from the the sun into carbon bonds, such as those found in the sugar glucose through the process of photosynthesis.

The amount of chemical energy storied as nutrients in the bodies and wastes of organisms flows through ecosystems from one trophic level to the next and through this flow energy also is lost as heat. And the chemical energy available to the succeeding feeding level decreases.

Posted in Biology

In the two-stage cooling method, what is the maximum amount of time allowed to cool food from 135 degrees F or more to 70 degrees F or less?

In the two-stage cooling method, time allowed to cool food from 135 degrees F or more to 70 degrees F or less can be four to six hours.

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