CHT Plant Physiology & Growth 2

Question 1

Photoperiodism refers to a plant's response to:

Accepted Answer

The relative lengths of day and night

Answer

The intensity of light during the day

Answer

The wavelength of light used for photosynthesis

Answer

The direction of light source

Question 2

Which plant hormone is most associated with fruit ripening and senescence?

Accepted Answer

Ethylene

Answer

Gibberellin

Answer

Cytokinin

Answer

Brassinolide

Question 3

What is the primary function of the phloem in vascular plants?

Accepted Answer

Transport of photosynthates (sugars) from leaves to other plant parts

Answer

Transport of water from roots to leaves

Answer

Transport of mineral nutrients from soil into roots

Answer

Structural support of stems and branches

Question 4

A plant showing interveinal chlorosis on young leaves (veins remain green, tissue between yellows) most likely has a deficiency of:

Accepted Answer

Iron or Manganese

Answer

Nitrogen

Answer

Phosphorus

Answer

Calcium

Question 5

Turgor pressure in plant cells is caused by:

Accepted Answer

Water entering the vacuole via osmosis, pushing against the cell wall

Answer

The weight of cytoplasm pushing against the cell wall

Answer

Cellulose microfibrils expanding under light exposure

Answer

ATP-driven pumps inflating the central vacuole

Question 6

C4 plants are better adapted to hot, sunny environments than C3 plants because they:

Accepted Answer

Concentrate CO2 around Rubisco, reducing photorespiration

Answer

Fix CO2 using a 3-carbon intermediate that is more stable at high temperatures

Answer

Open stomata at night to reduce water loss via CAM photosynthesis

Answer

Produce higher levels of ethylene to reduce leaf temperature

Question 7

What is vernalization?

Accepted Answer

Exposure to prolonged cold that triggers flowering in certain plants

Answer

Treating seeds with fungicide before planting

Answer

The process of hardening off transplants to outdoor conditions

Answer

Applying growth regulators to induce dormancy before winter