Plant Physiology — GK Questions with Answers

1. What kind of nutrition does a pitcher plant practise?
   1. Self-feeding
   2. Parasitic
   3. Insectivorous
   4. Saprophytic
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   Answer: (C) Insectivorous

   A pitcher plant is insectivorous, catching insects to make up for a shortage of nitrogen.

2. Where does aerobic respiration happen?
   1. In the chloroplast
   2. In the mitochondria
   3. In the nucleus
   4. In the cell wall
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   Answer: (B) In the mitochondria

   Aerobic respiration happens in the mitochondria of every cell, fully burning glucose in the presence of oxygen.

3. What is phloem’s main job?
   1. Carrying water
   2. Carrying food
   3. Gas exchange
   4. Making hormones
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   Answer: (B) Carrying food

   Phloem carries the food made in the leaves down to the roots and storage organs.

4. In nitrification, what does ammonia turn into?
   1. Nitrogen gas
   2. Nitrite-nitrate
   3. Ammonium ion
   4. Urea
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   Answer: (B) Nitrite-nitrate

   Nitrifying bacteria (like Nitrosomonas) convert ammonia into nitrite and then nitrate.

5. Which hormone promotes seed germination?
   1. Abscisic acid
   2. Gibberellin
   3. Ethylene
   4. None
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   Answer: (B) Gibberellin

   Gibberellin promotes seed germination, stem growth, and breaks seed dormancy.

6. What kind of photoperiod plant is Xanthium?
   1. Long-day
   2. Short-day
   3. Day-neutral
   4. Vernalisation-dependent
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   Answer: (B) Short-day

   Xanthium is a short-day plant (SDP), needing light below a fixed critical duration to flower.

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