Why do stomata close when a plant is short of water?

Q: How do I try a free CXC CAPE Biology question?

Just tap any of the four options on this page — no signup, no card, nothing to install. You'll see the correct answer and a full mark-scheme-style explanation within a second. Each visit shows a fresh randomly-picked question from the live CXC CAPE CSEC Biology bank, so you can keep refreshing to try different ones before deciding whether to create a free account for daily access.

Q: Is Kramizo really free for CXC CAPE Biology students?

Yes — completely free. Every student gets 45 questions a day on the free plan, across any board and any subject, with no card required and no trial countdown. Kramizo's optional Pro plan removes the daily cap and adds analytics, but the free plan is genuinely free forever. We make money from the small percentage of students who choose to upgrade — not from selling data or ads.

Q: Are the Biology questions aligned to the CXC CAPE CSEC syllabus?

Every question is written against the published CXC CAPE CSEC Biology syllabus and reviewed for accuracy before being added to the bank. We match the command words (state, describe, explain, evaluate), mark allocations, and difficulty tier you'll see on real CXC CAPE past papers. Explanations are written in the style of official examiner mark schemes so students learn exactly what marks are being awarded for.

Question

Why do stomata close when a plant is short of water?

Accepted Answer

To reduce water loss by transpiration, even though this limits carbon dioxide uptake — Award 1 mark. The plant trades photosynthesis for survival, and abscisic acid triggers the closure.

Answer

To raise the temperature of the leaf

Answer

To increase the rate of photosynthesis

Answer

To reduce water loss by transpiration, even though this limits carbon dioxide uptake

Answer

To allow more carbon dioxide to enter

One real Biology question.No signup. 30 seconds.

One real Biology question.
No signup. 30 seconds.