#stomatal movement MCQ

PSS-Sec-E-Sensory biology

Blue light–induced stomatal opening is primarily mediated by:

Answer: C) Phototropins. For PSS-Sec-E-Sensory biology, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Phytochromes; B) Cryptochromes; D) UVR8. Name the process first, then pick the option that describes it — don’t reverse cause and effect.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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STOMATA MOVEMENT +PYQS

Low intercellular CO₂ concentration causes stomata to:

Pick C: Open. Thinking through STOMATA MOVEMENT step by step rules out the lookalikes and leaves Open. Skip these: A) Close; B) Remain unchanged; D) Undergo plasmolysis. For hormones and genes, match the molecule or gene to its real role, not a neighboring pathway.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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STOMATA MOVEMENT +PYQS

In darkness, stomata close due to:

Answer: B) Exosmosis of water. For STOMATA MOVEMENT, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Increase in turgor pressure; C) K⁺ accumulation; D) Decrease in CO₂. Name the process first, then pick the option that describes it — don’t reverse cause and effect.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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STOMATA MOVEMENT +PYQS

Malate formation in guard cells occurs due to breakdown of:

Correct option is C, Starch. In STOMATA MOVEMENT problems like this, the accurate statement is Starch; the others are common mix-ups. Not these: A) Cellulose; B) Sucrose; D) Protein. Tissue transport questions usually turn on xylem vs phloem, living vs dead cells, or source vs sink.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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STOMATA MOVEMENT +PYQS

Starch–sugar interconversion theory of stomatal movement was proposed by:

B fits best: Lloyd. Keep the STOMATA MOVEMENT basics straight and Lloyd stands out as the precise answer. Avoid: A) Imamura; C) Levitt; D) Münch. Light and flowering items often hinge on which photoreceptor or day-length rule is in play.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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