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#circadian rhythm MCQ

3 public questions tagged with this topic.

Cryptochromes regulate circadian clock primarily through:

C fits best: CRY1 and CRY2. Keep the cryptochrome basics straight and CRY1 and CRY2 stands out as the precise answer. Avoid: A) PHYB interaction; B) COP1 only; D) CRY3 only. 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.

Light is considered the most potent zeitgeber for:

Answer: C) Circadian rhythm. 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) Phototropism; B) Vernalization; D) Shade avoidance. 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.

Zeitgebers are environmental cues that:

The right choice is C: Synchronize rhythms. In PSS-Sec-E-Sensory biology, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Disrupt rhythms; B) Sense rhythms; D) Destroy rhythms. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.

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