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#NEET biology

7 public questions tagged with this topic.

Biosynthesis of cytokinins starts with enzyme:

B fits best: IPT. Keep the Cytokinin basics straight and IPT stands out as the precise answer. Avoid: A) LOG; C) CKX; D) CYP735A. 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.

Cytokinins can exist in plants as all EXCEPT:

The right choice is D: Fatty acid esters. In Cytokinin, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Free bases; B) Ribosides; C) Ribotides. 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.

Most abundant cytokinin in higher plants is:

Go with C — Zeatin. Under Cytokinin, 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) Kinetin; B) iPA; D) TDZ. 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.

Cytokinins are adenine derivatives with which side chain?

Pick B: Isoprenoid. Thinking through Cytokinin step by step rules out the lookalikes and leaves Isoprenoid. Skip these: A) Phenyl; C) Steroid; D) Indole. 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.

Low cytokinin:auxin ratio promotes:

The right choice is B: Root formation. In Cytokinin, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Shoot formation; C) Callus growth; D) Flowering. 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.

High cytokinin:auxin ratio in tissue culture promotes:

Correct option is C, Shoot formation. In Cytokinin problems like this, the accurate statement is Shoot formation; the others are common mix-ups. Not these: A) Root formation; B) Callus formation; D) Somatic embryogenesis. 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.

Interruption of dark period by red light in short day plants results in:

Go with C — Inhibition of flowering. 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) Flowering; B) No effect; D) Early flowering. 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.