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#plant physiology practice

25 public questions tagged with this topic.

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.

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.

The chromophore of higher plant phytochrome is:

C fits best: Phytochromobilin. Keep the PHYTOCHROME basics straight and Phytochromobilin stands out as the precise answer. Avoid: A) Biliverdin; B) Chlorophyll; D) Flavin. 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.

Vernalization causes flowering by:

Go with B — Epigenetically silencing FLC. 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) Activating FLC; C) Degrading FT protein; D) Repressing SOC1. 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.

Which hormone can substitute for cold treatment in some plants?

Pick C: Gibberellic acid. Thinking through VERNALIZATION & FLOWERING step by step rules out the lookalikes and leaves Gibberellic acid. Skip these: A) Auxin; B) Cytokinin; D) Abscisic acid. 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.

Constitutive photomorphogenic mutants show photomorphogenesis even in:

The right choice is B: Dark. 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) Light; C) Far-red light; D) Shade. 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.

In light conditions, COP1 is predominantly localized in the:

Correct option is B, Cytosol. In PSS-Sec-E-Sensory biology problems like this, the accurate statement is Cytosol; the others are common mix-ups. Not these: A) Nucleus; C) Chloroplast; D) Mitochondria. 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.

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.

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.

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.

Long-short day plants flower after:

That points to C: Sequence of long days followed by short days. Compared with the other options, Sequence of long days followed by short days is the one that correctly describes the PHOTOPERIODISM concept. The wrong ones are A) Only long days; B) Only short days; D) Random photoperiod. 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.

FT gene product functions as:

Pick B: Florigen. Thinking through PHOTOPERIODISM step by step rules out the lookalikes and leaves Florigen. Skip these: A) Photoreceptor; C) Repressor of flowering; D) Growth inhibitor. 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.