Stomatal Regulation Research Recap Quiz

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What is the general role of Abscisic acid (ABA) in plant growth?

Enhancing photosynthetic rate

Stimulating CO2 uptake

Promoting stomatal opening

Reducing water loss by closing stomata (correct)

Where is ABA synthesized in plants?

In the stomata

In the root and leaf vasculature (correct)

In the xylem vessels

In the chloroplasts

How do small molecules known as plant hormones act in plants?

By acting as signals to evoke responses in plants (correct)

By promoting excessive water uptake

By promoting wilting of leaves

By inhibiting root growth

What is one of the effects of ABA on stomata?

Reducing water loss by closing stomata Signup and view all the answers

In what plant organ is ABA involved in stimulating water uptake?

Roots Signup and view all the answers

Which of the following is NOT a role of ABA in plant growth?

Stimulating CO2 uptake Signup and view all the answers

What is the main physiological role of basal abscisic acid (ABA) mentioned in the text?

Affecting water homeostasis Signup and view all the answers

Based on the information in the text, what is the effect of ABA on the deposition of suberin layers in plants?

Promoting the deposition of suberin layers Signup and view all the answers

In the context of stomatal regulation, which hypothesis suggests that potassium transporters play a crucial role?

Stomatal Aperture Recap Hypothesis Signup and view all the answers

What is the Null Hypothesis in the experimental design discussed in the text?

There will be no difference between mutants and wild-type plants in stomatal responses Signup and view all the answers

What was the specific treatment given to peeled strips in the experimental design mentioned in the text?

Incubation in KCl, CaCl2, and MES-KOH Signup and view all the answers

What do statistically significant asterisks (*) indicate regarding stomatal responses in the experimental results?

Significant difference between mutant and wild-type plants' responses Signup and view all the answers

What is the main finding regarding transgenic Arabidopsis plants overexpressing H+-ATPase using the strong guard cell promoter GC1?

Enhanced light-induced stomatal opening, photosynthesis, and plant growth Signup and view all the answers

What was the percentage increase in the fresh and dry weights of rosette leaves in the first 25 days of growth in the transgenic plants compared to the wild type?

42–63% Signup and view all the answers

Which treatment resulted in the dry weights of total flowering stems of 45-day-old transgenic plants being ∼36–41% greater than those of the wild type?

Overexpression of H+-ATPase in guard cells Signup and view all the answers

What is considered a limiting factor in photosynthesis and plant growth according to the results presented?

Stomatal aperture Signup and view all the answers

In response to red light, how is stomatal opening thought to be induced?

Via photosynthesis in guard cell chloroplasts Signup and view all the answers

Contrary to overexpression of H+-ATPase, what was the result when phototropin or inward-rectifying K+ channels were overexpressed in guard cells?

No effect on phenotypes related to stomatal opening, photosynthesis, and plant growth Signup and view all the answers