CHT Plant Physiology & Growth

Question 1

Which plant hormone is primarily responsible for promoting cell elongation and is produced in the apical meristem?

Accepted Answer

Auxin

Answer

Auxin (IAA) is produced in apical meristems and promotes cell elongation by loosening cell walls, driving stem extension.

Question 2

What is transpiration in plants?

Accepted Answer

The loss of water vapor through stomata and leaf surfaces

Answer

Transpiration is the process by which plants release water vapor, primarily through stomata, driving water uptake from the soil.

Question 3

Which organelle is the primary site of photosynthesis in plant cells?

Accepted Answer

Chloroplast

Answer

Chloroplasts contain chlorophyll and are the organelles where light energy is captured and converted into chemical energy (glucose).

Question 4

What is the term for the seed dormancy-breaking process that requires exposure to cold, moist conditions?

Accepted Answer

Stratification

Answer

Cold stratification mimics winter conditions and breaks physiological dormancy in seeds of many temperate species.

Question 5

Which macronutrient is most critical for vegetative (leaf) growth and gives plants their green color?

Accepted Answer

Nitrogen

Answer

Nitrogen is a key component of chlorophyll and amino acids, making it essential for lush vegetative growth.

CHT - Certified Horticultural Technician Practice Test