#phytochrome MCQ

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.

View Details

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.

View Details

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.

View Details

PHYTOCHROME+PYQS

Arabidopsis contains how many phytochrome isoforms?

Correct option is D, Five. In PHYTOCHROME problems like this, the accurate statement is Five; the others are common mix-ups. Not these: A) Two; B) Three; C) Four. 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.

View Details

PHYTOCHROME+PYQS

PhyB is most strongly associated with regulation of:

Pick B: Shade avoidance. Thinking through PHYTOCHROME step by step rules out the lookalikes and leaves Shade avoidance. Skip these: A) Seed germination; C) Vernalization; D) Stomatal movement. 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.

View Details

PHYTOCHROME+PYQS

Photoreversibility of phytochrome refers to:

Answer: B) Interconversion between Pr and Pfr. For PHYTOCHROME, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Degradation of phytochrome in light; C) Binding of chromophore; D) Movement into nucleus. 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.

View Details

PSS-Sec-E-Sensory biology

Phytochrome-mediated nuclear import occurs upon conversion to:

The right choice is B: Pfr. 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) Pr; C) Inactive form; D) Phototropin. 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.

View Details

PHOTOPERIODISM+PYQS

Which form of phytochrome is biologically active?

Go with B — Pfr. Under PHOTOPERIODISM, 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) Pr; C) Both; D) None. 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.

View Details