Tropic

Question 1

What are tropisms?

Answer 1

Growth responses of plants towards or away from stimuli

Examples of stimuli include light, water, and gravity.

Question 2

What is phototropism?

Answer 2

The growth response of a plant towards or away from light

Question 3

What is gravitropism?

Answer 3

The response of a plant to the stimulus of gravity

Question 4

What is a positive response in tropisms?

Answer 4

Growth towards a stimulus

Question 5

What is a negative response in tropisms?

Answer 5

Growth away from a stimulus

Question 6

In phototropism, how do shoots respond to light?

Answer 6

Shoots show positive phototropism and grow towards the source of light

Question 7

In phototropism, how do roots respond to light?

Answer 7

Roots show negative phototropism and grow away from the direction of light

Question 8

What is the importance of phototropism?

Answer 8

Allows leaves to absorb maximum light for photosynthesis

Question 9

How do roots respond in gravitropism?

Answer 9

Roots show positive gravitropism and grow downwards towards gravity

Question 10

How do shoots respond in gravitropism?

Answer 10

Shoots show negative gravitropism and grow upwards against gravity

Question 11

What is the importance of gravitropism?

Answer 11

Helps anchor the plant and allows roots to obtain water and minerals

Question 12

What is auxin?

Answer 12

A growth hormone that controls the direction of growth in plants

Question 13

Where is auxin primarily produced?

Answer 13

In the tips of growing stems and roots (apical meristems)

Question 14

How does auxin affect cell growth in shoots?

Answer 14

Stimulates cells behind the tip to elongate; more auxin means faster growth

Question 15

What happens when light shines uniformly on a plant shoot?

Answer 15

Auxin is distributed evenly and cells grow at the same rate

Question 16

What happens when light shines from one side on a shoot?

Answer 16

Auxin concentrates on the shaded side, causing that side to elongate faster

Question 17

What is the effect of high concentrations of auxin on stems?

Answer 17

Promotes growth in stems

Question 18

What is the effect of high concentrations of auxin on roots?

Answer 18

Reduces growth in roots

Question 19

Fill in the blank: The unequal distribution of auxin causes _______ in gravitropism.

Answer 19

different growth responses

Question 20

What experimental setup is used to investigate phototropism?

Answer 20

Three identical plants with varying light exposure

Question 21

What role does a clinostat play in experiments?

Answer 21

Cancels out the effect of light or gravity

Question 22

What happens to seedlings in a clinostat during gravitropism experiments?

Answer 22

They show no gravitropic response and grow straight outwards

Question 23

What is the purpose of conducting experiments in a light-proof box?

Answer 23

To cancel out the effect of light on the growth of seedlings

Question 24

What is the result of placing a seedling horizontally regarding auxin distribution?

Answer 24

Auxin accumulates on the lower surface of the root and stem

Question 25

In a horizontal seedling, which surface grows more due to auxin concentration?

Answer 25

The upper surface of the root grows more, causing downward growth

Question 26

In a horizontal seedling, which surface grows more in the stem due to auxin concentration?

Answer 26

The lower surface of the stem grows more, causing upward growth