#biology multiple choice question

PHYTOCHROME+PYQS

The Pr form of phytochrome absorbs maximally at approximately:

Answer: C) 660 nm. 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) 450 nm; B) 550 nm; D) 730 nm. 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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PHYTOCHROME+PYQS

Phytochrome exists in two photoreversible forms known as:

Correct option is B, Pr and Pfr. In PHYTOCHROME problems like this, the accurate statement is Pr and Pfr; the others are common mix-ups. Not these: A) P680 and P700; C) PSI and PSII; D) PhyA and PhyB. 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

Phytochrome is a photoreceptor that primarily absorbs:

That points to C: Red and far-red light. Compared with the other options, Red and far-red light is the one that correctly describes the PHYTOCHROME concept. The wrong ones are A) Blue light; B) Green light; D) UV-B light. 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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VERNALIZATION & FLOWERING+PYQS

The main adaptive significance of vernalization is to:

Go with B — Prevent flowering before winter. Under VERNALIZATION & FLOWERING, 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) Increase photosynthesis; C) Promote vegetative growth; D) Enhance seed dormancy. 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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VERNALIZATION & FLOWERING+PYQS

Cold requirement for germination of seeds is termed:

The right choice is C: Stratification. In VERNALIZATION & FLOWERING, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Vernalization; B) Photoperiodism; D) Dormancy. 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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VERNALIZATION & FLOWERING+PYQS

Which plant category commonly requires vernalization?

B fits best: Winter annuals and biennials. Keep the VERNALIZATION & FLOWERING basics straight and Winter annuals and biennials stands out as the precise answer. Avoid: A) Summer annuals; C) Tropical plants; D) Aquatic plants. 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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PSS-Sec-E-Sensory biology

Long-day plants flower when:

Night length < critical (B) is correct here. This is core PSS-Sec-E-Sensory biology: once you know the definition or pathway step, Night length < critical is the clear fit. The wrong ones are A) Day length < critical; C) Night length > critical; D) Under darkness. 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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PSS- Sec-F-Transport

Casparian strip primarily functions to:

Correct option is B, Block apoplastic transport. In PSS- Sec-F-Transport problems like this, the accurate statement is Block apoplastic transport; the others are common mix-ups. Not these: A) Block symplastic transport; C) Enhance diffusion; D) Create passage cells. 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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PSS- Sec-F-Transport

Gravity perception in roots occurs mainly in:

Pick C: Root cap. Thinking through PSS- Sec-F-Transport step by step rules out the lookalikes and leaves Root cap. Skip these: A) Elongation zone; B) Quiescent center; D) Endodermis. 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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PSS- Sec-F-Transport

Polar auxin transport is mediated mainly by:

The right choice is C: Protein carriers in plasma membrane. In PSS- Sec-F-Transport, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Plasmodesmata; B) Diffusion; D) Xylem vessels. 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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MINERAL Transport+PYQS

Hydroponics refers to plant growth in:

Answer: C) Nutrient solution without soil. For MINERAL Transport, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Soil with fertilizers; B) Sand medium; D) Air only. 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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MINERAL Transport+PYQS

Boron plays a role mainly in:

That points to B: Cell elongation and wall integrity. Compared with the other options, Cell elongation and wall integrity is the one that correctly describes the MINERAL Transport concept. The wrong ones are A) ATP synthesis; C) Chlorophyll formation; D) Respiration. 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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