PHYTOCHROME+PYQS

PHYTOCHROME+PYQS

A mutation in phyB generally results in plants that:

That points to B: Leaf abscission. Compared with the other options, Leaf abscission is the one that correctly describes the PHYTOCHROME concept. The wrong ones are A) Cell division; C) Photosynthesis; D) Dormancy. 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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PHYTOCHROME+PYQS

Type-II phytochromes include all EXCEPT:

PhyA (D) is correct here. This is core PHYTOCHROME: once you know the definition or pathway step, PhyA is the clear fit. The wrong ones are A) PhyB; B) PhyC; C) PhyD. 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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PHYTOCHROME+PYQS

Type-I phytochromes are characterized by being:

Go with B — Dark stable. Under PHYTOCHROME, 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) Light stable; C) Only nuclear; D) Only cytoplasmic. 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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PHYTOCHROME+PYQS

Which protein helps transport phyA into the nucleus?

C fits best: FHY1. Keep the PHYTOCHROME basics straight and FHY1 stands out as the precise answer. Avoid: A) HY5; B) COP1; D) SPA1. 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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PHYTOCHROME+PYQS

During photomorphogenesis, HY5 protein levels are:

High (C) is correct here. This is core PHYTOCHROME: once you know the definition or pathway step, High is the clear fit. The wrong ones are A) Low; B) Absent; D) Unchanged. 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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PHYTOCHROME+PYQS

HY5 protein acts as a:

Correct option is C, Positive regulator of photomorphogenesis. In PHYTOCHROME problems like this, the accurate statement is Positive regulator of photomorphogenesis; the others are common mix-ups. Not these: A) Negative regulator; B) Photoreceptor; D) Enzyme. 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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PHYTOCHROME+PYQS

In darkness, COP1 is localized mainly in the:

Pick C: Nucleus. Thinking through PHYTOCHROME step by step rules out the lookalikes and leaves Nucleus. Skip these: A) Chloroplast; B) Cytoplasm; D) Cell wall. 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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PHYTOCHROME+PYQS

COP1 protein functions mainly as:

Pick C: E3 ubiquitin ligase. Thinking through PHYTOCHROME step by step rules out the lookalikes and leaves E3 ubiquitin ligase. Skip these: A) Transcription factor; B) Kinase; D) Photoreceptor. 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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PHYTOCHROME+PYQS

In light, Pfr binding to PIFs results in:

Pick B: Degradation of PIFs. Thinking through PHYTOCHROME step by step rules out the lookalikes and leaves Degradation of PIFs. Skip these: A) Activation of PIFs; C) Nuclear export of phytochrome; D) Inhibition of HY5. 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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PHYTOCHROME+PYQS

Phytochrome interacting factors (PIFs) primarily act as:

The right choice is B: Negative regulators of photomorphogenesis. In PHYTOCHROME, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Positive regulators of photomorphogenesis; C) Photoreceptors; D) Hormones. 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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PHYTOCHROME+PYQS

In shade conditions, plants typically show:

Stem elongation (C) is correct here. This is core PHYTOCHROME: once you know the definition or pathway step, Stem elongation is the clear fit. The wrong ones are A) Reduced stem elongation; B) Increased leaf expansion; D) Reduced auxin. 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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PHYTOCHROME+PYQS

Shade avoidance responses are triggered when the R:FR ratio is:

Go with C — Low. Under PHYTOCHROME, 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) High; B) Unchanged; D) Zero. 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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