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Zina [86]
2 years ago
12

Students testing the effects of solute concentration in soil on plant transpiration noticed a significant decrease in transpirat

ion when abscisic acid was used as the solute. Even at molar concentrations less than 0.2 M, transpiration seemed to stop almost completely.
a) Make a claim as to which structural and/or physiological component of transpiration is affected by the presence of abscisic acid.
b) Explain the reasoning that supports your claim.
Biology
1 answer:
shepuryov [24]2 years ago
8 0

Answer:

look in textbook - concept 29.6

Explanation:

Drought stress can also cause stomata to close. A hormone called abscisic acid (ABA) is produced in roots and leaves in response to water deficiency and signals guard cells to close stomata. This response reduces wilting but also restricts CO2 absorption, thereby slowing photosynthesis. ABA also directly inhibits photosynthesis. Water availability is so tied to plant productivity not because water is needed as a substrate in photosynthesis but because freely available water allows plants to keep stomata open and take up more CO2.

abscisic acid (ABA): A plant hormone that slows growth, often antagonizing the actions of growth hormones. Two of its many effects are to promote seed dormancy and facilitate drought tolerance.

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Drupady [299]

Answer:

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Explanation:

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Carbon is necessary for all living beings, without exception. This is because it is used in the construction of organic molecules without which no living thing can survive, in addition to providing energy when it participates in sugar molecules, such as carbohydrates.

3 0
2 years ago
Use the model here to describe the transfer of matter and flow of energy from one trophic level to another within an ecosystem.
Brrunno [24]

Answer:

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B) Energy that is not transferred from one organism to another is either used up by the organism for various purposes. Most of the energy is lost into the environment in the form of heat.

c) There are typically fewer organisms at the top of the trophic levels because energy keeps on declining at each trophic levels so the number of consumers which it can satisfy also decreases.

d) Only 10% of the energy passes from one trophic level to another. The rest is usually lost in the form of heat. For example, if there was 100%  energy in the producers, only 10% would pass to the primary consumers. The secondary consumers will receive 1%.

6 0
2 years ago
Which of the following would not result in the dilation of the feeder arterioles and opening of the pre capillary sphincter in s
motikmotik

Answer:

Option (C).

Explanation:

The dilation of feeder arterioles carry blood directly into the blood vessels. The pre capillary sphincter in the systemic capillary beds can open due to the different factors.

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5 0
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Explanation:

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2 years ago
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stich3 [128]

Answer:

C

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2 years ago
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