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Daniel [21]
3 years ago
9

Guard cells are located on the surface of the underside of leaves. how does this structure of the leaf enable the function of gu

ard cells?
Biology
1 answer:
velikii [3]3 years ago
4 0

<span>Basically, guard cells are cells surrounding each stoma and they help to set the rate of transpiration by opening and closing the stomata. Some guard cells are turgid or swollen and the stomatal opening is large. Hence ths turgidity is caused by the accumulation of the potassium ions in the guard cells. Thus, when the potassium ions or K+ levels happen to increase in the guard cells the water potential of the guard cells drops and water enters the guard cells. Some guard cells have lost water which causes the cells to become flaccid and the stomatal opening to close. This may occur when the plant has lost an exessive amount of water. Moreover guard cells function are the stomatal closing and the stomatal opening of the plant.</span>

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6 0
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Both normal and transient flora can become opportunistic pathogens. True or False
ElenaW [278]

Answer:

True

Explanation:

Normal flora are  microorganisms that are regarded as resident organisms, which can be found on or in an individual and do not cause any disease.

the transient flora refers to microorganisms that are found on the skin or the hands which are there through direct contact with person or object, and are easily removed by routine hand hygiene. Example is Norovirus that can cause stomach flu.

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In this case, the normal and transient flora like Norovirus can only cause infection when the immune system is down. That is why they are regarded as opportunistic pathogens.

3 0
3 years ago
Read 2 more answers
Based on the information in the chart, during which eon would you expect to find fossil evidence about the evolution of insects?
Ivahew [28]

Answer:

A) Phanerozoic

Explanation:

In the given question, the chart about the evolution of insects has not been provided but based on the previous knowledge, this question can be answered.

The geologists have divided the time scale into many variables in which Eon represent the longest time scale period which has lasted for the millions of year.

The Phanerozoic eon represents the time scale during which first visible life evolved and began around 542 million years ago and is present until today. The insects belong to the arthropod group which evolved during a smaller time scale called Devonian period.

Since the insects evolved around 479 million years ago which falls under the Phanerozoic eon, therefore, phanerozoic is the correct answer.

Thus, Option-A is correct.

6 0
3 years ago
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Hoped this helped:)

3 0
3 years ago
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