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Auxin Phytohormone

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30 questions

Storage form of auxin in plants is mainly:

Correct option is B, GA. In Auxin Phytohormone problems like this, the accurate statement is GA; the others are common mix-ups. Not these: A) ABA; C) Ethylene; D) Auxin. 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.

High auxin concentration is toxic due to loss of:

Answer: C) Homeostasis. For Auxin Phytohormone, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Transport; B) Diffusion; D) Receptors. 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.

Polar auxin transport is unique because it is:

Correct option is C, Directional. In Auxin Phytohormone problems like this, the accurate statement is Directional; the others are common mix-ups. Not these: A) Passive; B) Diffusive; D) Random. 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.

Removal of apical bud results in:

That points to C: Lateral bud growth. Compared with the other options, Lateral bud growth is the one that correctly describes the Auxin Phytohormone concept. The wrong ones are A) Reduced branching; B) Increased auxin; D) Root inhibition. 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.

Auxin maintains apical dominance by inhibiting:

Answer: C) Lateral buds. For Auxin Phytohormone, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Roots; B) Leaves; D) Flowers. 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.

Auxin-induced seedless fruit formation is termed:

B fits best: Parthenocarpy. Keep the Auxin Phytohormone basics straight and Parthenocarpy stands out as the precise answer. Avoid: A) Apomixis; C) Vivipary; D) Polyembryony. 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.

ARF proteins function as:

The right choice is C: Transcription factors. In Auxin Phytohormone, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Receptors; B) Transporters; D) Enzymes. 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.

Auxin response elements in promoters are called:

Go with B — AuxRE. Under Auxin Phytohormone, 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) TATA box; C) CAAT box; D) Enhancer. 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.

Auxin acts as molecular glue between:

Go with B — TIR1–AUX/IAA. Under Auxin Phytohormone, 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) ARF–DNA; C) PIN–ABCB; D) AUX1–LAX. 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.

Auxin receptor functioning as F-box protein is:

That points to B: TIR1. Compared with the other options, TIR1 is the one that correctly describes the Auxin Phytohormone concept. The wrong ones are A) ABP1; C) PIN1; D) AUX1. 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.

Auxin signaling involves degradation of which protein?

Go with C — AUX/IAA. Under Auxin Phytohormone, 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) ARF; B) PIN; D) YUCCA. 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.

Optimal apoplastic pH favoring auxin uptake is:

The right choice is C: 5.0–5.5. In Auxin Phytohormone, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) 7; B) 6.5; D) 4. 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.