Question 1

Which plant hormone is primarily responsible for promoting seed germination?

Accepted Answer

Gibberellin

Answer

Abscisic Acid

Answer

Cytokinin

Answer

Auxin

Question 2

What is the primary function of auxin in plant phototropism?

Accepted Answer

To promote cell elongation on the shaded side of the plant

Answer

To inhibit cell division

Answer

To increase water potential

Answer

To stimulate stomatal opening

Question 3

Which hormone is responsible for closing stomata in response to drought stress?

Accepted Answer

Abscisic Acid (ABA)

Answer

Gibberellin

Answer

Cytokinin

Answer

Ethylene

Question 4

What is the role of gibberellin in stem growth?

Accepted Answer

Stimulating elongation of internodes

Answer

Inhibiting leaf senescence

Answer

Promoting flowering

Answer

Increasing photosynthesis

Question 5

What is the primary effect of auxin on phototropism in plants?

Accepted Answer

Auxin causes cells on the shaded side to elongate more than those on the lighted side

Answer

Auxin inhibits growth on the shaded side

Answer

Auxin distributes evenly in the plant

Answer

Auxin promotes root growth in sunlight

Question 6

Which plant hormone is primarily involved in the process of seed dormancy?

Accepted Answer

Abscisic Acid (ABA)

Answer

Auxin

Answer

Gibberellin

Answer

Ethylene

Question 7

Which of the following statements about gibberellin is true?

Accepted Answer

Gibberellin promotes stem elongation and seed germination

Answer

Gibberellin is primarily involved in fruit ripening

Answer

Gibberellin inhibits root growth

Answer

Gibberellin only affects leaf growth

Question 8

What effect does increasing water potential have on stomatal opening?

Accepted Answer

It promotes stomatal opening.

Answer

It leads to wilting of the plant.

Answer

It has no effect on stomatal opening.

Answer

It causes stomatal closure.

Question 9

How does abscisic acid (ABA) affect guard cells during drought conditions?

Accepted Answer

It causes the guard cells to lose turgor pressure and close the stomata.

Answer

It stimulates the uptake of water into guard cells.

Answer

It has no impact on guard cell functionality.

Answer

It increases photosynthesis rate in guard cells.

Question 10

What role does water potential play in the stomatal opening process?

Accepted Answer

Water potential drives the movement of water into guard cells, causing them to swell and open the stomata.

Answer

Water potential primarily affects root growth, not stomatal function.

Answer

Water potential has no significant role in stomatal opening.

Answer

High water potential causes guard cells to shrink and close the stomata.

Question 11

What happens to stomata when a plant experiences water stress?

Accepted Answer

The stomata close to prevent water loss.

Answer

The stomata enlarge to absorb more CO2.

Answer

The stomata open to increase transpiration.

Answer

The stomata remain unchanged.

Question 12

What is the primary function of guard cells surrounding stomata?

Accepted Answer

To regulate the opening and closing of stomata.

Answer

To absorb nutrients from the soil.

Answer

To transport water across the leaf.

Answer

To produce chlorophyll for photosynthesis.

Question 13

How does high humidity affect stomatal opening?

Accepted Answer

It promotes stomatal opening.

Answer

It causes stomatal closure.

Answer

It has no effect on stomatal opening.

Answer

It leads to guard cell wilting.

Question 14

What role does ethene play in the process of leaf abscission?

Accepted Answer

It promotes the formation of an abscission layer.

Answer

It increases auxin levels.

Answer

It inhibits leaf falling.

Answer

It prevents chlorophyll breakdown.

Question 15

Which process initiates the increase of ethene production leading to leaf abscission?

Accepted Answer

A decrease in auxin levels.

Answer

Increase in water availability.

Answer

Increase in chlorophyll levels.

Question 16

What is known to trigger the onset of leaf abscission in relation to environmental changes?

Accepted Answer

Reduced light and lower temperatures.

Answer

Higher nutrient levels in the soil.

Answer

Enhanced photosynthesis rates.

Answer

Increased humidity and warmth.

Question 17

During the process of leaf abscission, how does the balance between ethene and auxin levels change?

Accepted Answer

Ethene levels increase while auxin levels decrease.

Answer

Both levels increase equally.

Answer

Neither hormone changes significantly.

Answer

Auxin levels increase while ethene levels decrease.

Question 18

What is the primary function of the abscission layer formed during leaf abscission?

Accepted Answer

To sever the connection between the leaf and the stem.

Answer

To promote new leaf growth.

Answer

To retain water within the leaf.

Answer

To enhance chlorophyll production.

Question 19

How does the process of leaf abscission benefit a plant during adverse environmental conditions?

Accepted Answer

It reduces water loss and conserves energy.

Answer

It promotes root growth.

Answer

It enhances photosynthesis.

Answer

It increases nutrient uptake.

Related quizzes

Related quizzes