cryptochrome

cryptochrome

In plants overexpressing CIB1, flowering occurs:

Correct option is C, Earlier than wild type. In cryptochrome problems like this, the accurate statement is Earlier than wild type; the others are common mix-ups. Not these: A) Later than wild type; B) Same time as wild type; D) Only under short days. 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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cryptochrome

FT protein regulated by cryptochrome signaling acts as:

That points to B: Florigen. Compared with the other options, Florigen is the one that correctly describes the cryptochrome concept. The wrong ones are A) Photoreceptor; C) Repressor; D) Enzyme. If you’re stuck, eliminate anything that contradicts a basic fact you already know for this topic.

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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cryptochrome

CIB1 regulates flowering by binding to promoter of:

FT (C) is correct here. This is core cryptochrome: once you know the definition or pathway step, FT is the clear fit. The wrong ones are A) AP1; B) LFY; D) FLC. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.

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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cryptochrome

CRY2 promotes flowering by interacting with which transcription factor?

Correct option is B, CIB1. In cryptochrome problems like this, the accurate statement is CIB1; the others are common mix-ups. Not these: A) HY5; C) PIF; D) CO. 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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cryptochrome

Which cryptochrome plays a major role in flowering induction?

Correct option is B, CRY2. In cryptochrome problems like this, the accurate statement is CRY2; the others are common mix-ups. Not these: A) CRY1; C) CRY3; D) All. 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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cryptochrome

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.

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cryptochrome

Overexpression of cryptochrome C-terminal region alone causes plants to:

Show cop mutant-like phenotype (B) is correct here. This is core cryptochrome: once you know the definition or pathway step, Show cop mutant-like phenotype is the clear fit. The wrong ones are A) Behave like dark-grown seedlings; C) Lose photomorphogenesis; D) Fail to germinate. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.

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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cryptochrome

HY5 protein functions as:

Positive regulator of photomorphogenesis (B) is correct here. This is core cryptochrome: once you know the definition or pathway step, Positive regulator of photomorphogenesis is the clear fit. The wrong ones are A) Negative regulator of photomorphogenesis; C) Photoreceptor; D) Hormone. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.

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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cryptochrome

Blue light activation of cry1 results in:

The right choice is B: Sequestration of COP1/SPA1. In cryptochrome, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Enhanced COP1 activity; C) HY5 degradation; D) Reduced transcription. 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.

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cryptochrome

In darkness, COP1/SPA1 complex mainly causes:

Degradation of HY5 (B) is correct here. This is core cryptochrome: once you know the definition or pathway step, Degradation of HY5 is the clear fit. The wrong ones are A) Activation of HY5; C) Activation of cryptochrome; D) Inhibition of ubiquitination. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.

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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cryptochrome

Cryptochrome signaling requires which structural feature absent in photolyase?

Pick B: C-terminal extension. Thinking through cryptochrome step by step rules out the lookalikes and leaves C-terminal extension. Skip these: A) PHR domain; C) FAD-binding site; D) Dimerization site. 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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cryptochrome

Light perception by cryptochrome alters conformation of which region?

Go with B — C-terminal extension. Under cryptochrome, this is the standard explanation you’d use in class: it names the real driver or definition, while the rest are nearby but wrong. Not these: A) N-terminal PHR; C) PAS domain; D) DNA-binding domain. When two options sound similar, choose the one that matches the textbook definition most tightly.

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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