Crop Growth, Development and Plant Physiology MCQs 2026

Transpiration is the loss of water from plants mainly as

1. A Liquid sap only ✓
2. B Solid ice ✓
3. C Water vapour ✓
4. D Seed oil ✓

Vernalization refers to induction of flowering by exposure to

1. A High salinity ✓
2. B Deep flooding ✓
3. C Low temperature ✓
4. D Pesticide spray ✓

Ethylene is a plant hormone important in

1. A Root hair counting ✓
2. B Soil erosion ✓
3. C Fruit ripening ✓
4. D Canal seepage ✓

The cell wall of higher plants is composed mainly of

1. A Chlorophyll ✓
2. B Starch only ✓
3. C Cellulose ✓
4. D Protein hormones ✓

Phloem transports mainly

1. A Only sand particles ✓
2. B Only rainwater ✓
3. C Sugars and organic solutes ✓
4. D Only oxygen gas ✓

Phosphorus is especially important for

1. A Only leaf hair formation ✓
2. B Only pesticide smell ✓
3. C Energy transfer through ATP ✓
4. D Only soil colour ✓

Apical dominance is mainly controlled by auxin produced in the

1. A Root cap only ✓
2. B Old bark only ✓
3. C Shoot tip ✓
4. D Dry seed coat ✓

Wilting occurs when plant cells lose

1. A Genetic code ✓
2. B Leaf colour only ✓
3. C Turgor ✓
4. D All minerals instantly ✓

Grain filling is the period when

1. A Seeds lose all starch ✓
2. B Leaves stop all activity instantly ✓
3. C Dry matter accumulates in developing grain ✓
4. D Roots detach from soil ✓

ATP is commonly called the cell's energy currency because it

1. A Makes cell walls only ✓
2. B Is a soil mineral ✓
3. C Stores and transfers usable energy ✓
4. D Blocks respiration ✓

The reproductive phase mainly includes

1. A Only root hair initiation ✓
2. B Only leaf expansion ✓
3. C Flowering, fruiting and seed formation ✓
4. D Only tillage ✓

The primary pigment responsible for photosynthesis is

1. A Lignin ✓
2. B Cellulose ✓
3. C Chlorophyll ✓
4. D Suberin ✓