Back to your test review

Water stress reduces photosynthesis mainly because it causes

  • (a) an increase in chlorophyll in the leaves Your answer
  • (b) opening of stomata, so more O2 is lost Your answer
  • (c) closure of stomata, so less CO2 enters Correct
  • (d) faster carboxylation of RuBP in the stroma Your answer
Your answer: Correct answer: (c)
Advertisement

Explanation

Why (c) is correct

Water stress causes the stomata to close. Then less CO2 can enter the leaf, so photosynthesis falls. Water stress also makes leaves wilt and reduces their surface area.

Why the other options are wrong

  • (a) · your answer Water stress does not increase chlorophyll.
  • (b) · your answer Stomata close, not open, under water stress.
  • (d) · your answer Carboxylation slows down because less CO2 is available.
NCERT point: Water affects photosynthesis mainly indirectly, through stomata.
What is wrong?
Thank you! We will check this question.
Practise Photosynthesis in Higher Plants
Take a free 15-question NEET Biology test on this chapter. Timed, scored instantly.
Start free test

Similar questions

In the half-leaf experiment, one part of a leaf is enclosed in a test tube containing cotton soaked in KOH. That part sh… The half-leaf experiment with KOH demonstrates that Ingenhousz observed that small bubbles formed around the green parts of an aquatic plant in bright sunlight but not in t…