Plants- Co-ordination And Response

Question 1

What are tropisms?

Answer 1

Directional responses by plants to stimuli from their environment. They respond by growing towards or away from a stimulus.

Question 2

What happens in a positive tropism?

Answer 2

Growth occurs towards the direction of a stimulus

Question 3

What happens in a negative tropism?

Answer 3

Growth occurs away front he direction of a stimulus

Question 4

What is a growth towards light source called?

Answer 4

Positive phototropism

Question 5

What is a growth away from the light source called?

Answer 5

• negative phototropism

Question 6

what is the growth away from the direction of gravity called?

Answer 6

Negative geotropsim

Question 7

What is the growth towards the direction of gravity called?

Answer 7

Positive geotropism

Question 8

What is cell elongation?

Answer 8

• process where plant cells become longer, usually stimulated by auxins, to control growth responses like phototropism and gravitropism.

Question 9

Why do plants need to respond to stimuli?

Answer 9

Plants increase their chances of survival by responding to changes in their environment, such as sensing light and gravity.

Question 10

How do plants respond to light?

Answer 10

Plants sense the direction of light and grow towards it to maximize light absorption for photosynthesis.

Question 11

How do climbing plants respond to their environment?

Answer 11

Climbing plants have a sense of touch, allowing them to find things to climb and reach sunlight.

Question 12

How do plants respond to the presence of predators?

Answer 12

Plants like white clover can produce toxic substances to avoid being eaten by predators such as cattle.

Question 13

What is abiotic stress in plants?

Answer 13

Abiotic stress refers to harmful natural but non-living factors, like drought.

Question 14

How do carrots respond to low temperatures?

Answer 14

Carrots produce antifreeze proteins that bind to ice crystals, lowering the freezing temperature of water.

Question 15

What are auxins?

Answer 15

Auxins are plant hormones that control growth at the tips of shoots and roots.

Question 16

How do auxins move in plants?

Answer 16

Auxins move through the plant in solution, dissolved in water.

Question 17

Where are auxins produced?

Answer 17

Auxins are produced in the tips of shoots and roots and diffuse backwards to stimulate cell elongation.

Question 18

What is the effect of auxins on shoot and root growth?

Answer 18

Auxins promote growth in shoots but inhibit growth in roots.

Question 19

What is phototropism?

Answer 19

Phototropism is the growth response of plants to light.

Question 20

What is geotropism?

Answer 20

Geotropism is the growth response of plants to gravity.

Question 21

How do shoots respond to light?

Answer 21

When a shoot tip is exposed to light, auxin accumulates more on the shaded side, causing the shoot to bend towards the light.

Question 22

How do shoots respond to gravity?

Answer 22

When a shoot grows sideways, gravity causes more auxin to accumulate on the lower side, making the shoot bend upwards.

Question 23

How do roots respond to gravity?

Answer 23

Roots growing sideways have more auxin on the lower side, but the extra auxin inhibits growth, causing the root to bend downwards.

Question 24

How do roots respond to light?

Answer 24

If a root is exposed to light, auxin accumulates on the shaded side, inhibiting cell elongation and causing the root to bend downwards.

Question 25

Why do roots grow downwards?

Answer 25

Roots that are underground grow downwards due to positive gravitropism.

Question 26

Where do auxins accumulate in the shoot after they have reduced and diffused along?

Answer 26

Shaded side- away from the light- at the bottom

Question 27

Where do auxins accumulate in the root after they are reduced and diffused along?

Answer 27

On the lower side

Question 28

Are shoots positively or negatively phototropic? Are shoot positively or negatively geotropic? Where will the auxins accumulate in the shoot then?

Answer 28

Positively phototropic- grow towards the light Negatively geotropic- grow away front he ground- opposite direction the gravity Auxins will accumulate in the shade- away from the sun.

Question 29

What are Auxins?

Answer 29

Auxins are plant hormones that control growth by regulating cell elongation. They are mainly produced in the tips of shoots and roots and move through the plant to control growth direction.

Question 30

What are Tropisms?

Answer 30

Tropisms are plant growth responses to stimuli that help them grow in the right direction.

Question 31

What is Phototropism?

Answer 31

Phototropism is the response of plants to light, where auxins concentrate on the shaded side of the shoot, causing it to bend toward the light.

Question 32

What happens in Negative Phototropism?

Answer 32

In roots, auxins inhibit cell elongation, causing cells on the brighter side to grow faster and the root to bend away from light.

Question 33

What is Geotropism?

Answer 33

Geotropism (Gravitropism) is the response of plants to gravity.

Question 34

What is Positive Geotropism?

Answer 34

Positive Geotropism is when roots grow downward due to auxins accumulating on the lower side, causing the top side to grow faster.

Question 35

What is Negative Geotropism?

Answer 35

Negative Geotropism is when shoots grow upward, with auxins accumulating on the lower side, stimulating cell elongation on that side.