Agronomy Crop Physiology 3

Question 1

What is the Leaf Area Index (LAI)?

Accepted Answer

The ratio of total one-sided leaf area to ground surface area

Answer

The ratio of root surface area to leaf area

Answer

A measure of average leaf thickness in a canopy

Answer

The number of leaves per plant

Question 2

What does the harvest index (HI) measure in crop production?

Accepted Answer

The proportion of total biomass partitioned into the harvestable product

Answer

The weight of straw relative to grain weight

Answer

The efficiency of harvesting machinery

Answer

The number of plants harvested per hectare

Question 3

Which environmental factor does NOT directly drive stomatal opening or closing?

Accepted Answer

Soil pH

Answer

Blue light intensity

Answer

CO2 concentration inside the leaf

Answer

Leaf water status (turgor)

Question 4

What is the directional growth of a plant shoot toward a light source called?

Accepted Answer

Phototropism

Answer

Gravitropism

Answer

Hydrotropism

Answer

Thigmotropism

Question 5

What is the primary carbon-fixing enzyme in C3 photosynthesis?

Accepted Answer

RuBisCO

Answer

PEP carboxylase

Answer

Malate dehydrogenase

Answer

Pyruvate kinase

Question 6

What is the period of plant development from germination to the initiation of flowering called?

Accepted Answer

Vegetative phase

Answer

Senescence phase

Answer

Reproductive phase

Answer

Dormancy phase

Question 7

What is the microbial process that converts organic nitrogen in soil organic matter into plant-available ammonium (NH4+)?

Accepted Answer

Ammonification

Answer

Nitrification

Answer

Denitrification

Answer

Nitrogen fixation