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#photoreceptors

7 public questions tagged with this topic.

A Cell Signaling

In rod cells, light suppresses the dark current because:

Na⁺ channels in outer segment close, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)

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Cell Signaling GPCR Pathways - I

Low Ca2+ levels in rods activate

guanylyl cyclase, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)

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Cell Signaling GPCR Pathways - I

Rhodopsin kinase phosphorylates rhodopsin at

light-activated state, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)

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Phototropin+All PYQS

Phototropin signaling ultimately helps plants to:

Correct option is B, Optimize photosynthetic efficiency. In Phototropin+All problems like this, the accurate statement is Optimize photosynthetic efficiency; the others are common mix-ups. Not these: A) Reduce photosynthesis; C) Induce flowering; D) Inhibit growth. 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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Phototropin+All PYQS

Phototropins belong to which light perception range?

Blue light (320–500 nm) (C) is correct here. This is core Phototropin+All: once you know the definition or pathway step, Blue light (320–500 nm) is the clear fit. The wrong ones are A) UV-B; B) UV-A; D) Far-red. 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

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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PSS-Sec-E-Sensory biology

Cryptochromes are photoreceptors mainly for:

That points to B: Blue light. Compared with the other options, Blue light is the one that correctly describes the PSS-Sec-E-Sensory biology concept. The wrong ones are A) Red light; C) Far-red light; D) Green 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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