Adaptations in Cactus

Q.

Why are the leaves reduced to spines in the cactus?

1. None

2. To have more flowers.

3. To lose less water through transpiration.

4. To absorb more water

Q. Why do cactus have spines instead of leaves?

1. To prevent water loss by transpiration
2. Neither A nor B
3. To prevent excess photosynthesis
4. Both A and B

Q.

Which of the following are adaptations of desert plants?

1. roots are short.

2. lose very little water through transpiration

3. lose a lot of water through transpiration

4. leaves are broad

Q.

Leaves are reduced to spines in a cactus plant.

1. True
2. False

Q.

To survive in the winter without food and to conserve energy, some mountain animals ___ .

Q.

Which of the following is an adaptation in cactus?

1. Both a and d are correct

2. Both a and b are wrong

3. Both b and c are wrong

4. a is wrong but b is correct

Q.

Cacti survive in a desert because:

a. It has a flat green stem to store water and prepare food by photosynthesis.

b. The stem is covered with a thick layer of cuticle, which helps to preserve water.

c. Its roots are distributed on the surface to absorb water.

d. Leaves are modified into spines to prevent loss of water

1. Both b and c are wrong

2. Both a and b are wrong

3. a is wrong but b is correct

4. Both a and d are correct

Q.

In xerophytes, the waxy coating on the epidermis prevents _________.

Q. Why do cactus have spines instead of leaves?

1. Both A and B
2. To prevent excess photosynthesis
3. Neither A nor B
4. To prevent water loss by transpiration

Q.

The small surface area of leaves helps the plant in

1. reducing water loss

2. sunlight absorption

3. insects attraction

4. birds attraction

Q. Which of the following statements is/are correct?
Statement 1: The leaves in a cactus are modified into spines.
Statement 2: Thick waxy stem and spines reduce water loss through transpiration in a cactus.

1. Statement 1: True; Statement 2: True
2. Statement 1: False; Statement 2: True
3. Statement 1: False; Statement 2: False
4. Statement 1: True; Statement 2: False

Q.

Why do the plants on a snowy cold mountain and the plants on a hot arid desert appear very different in structure and shape?

Snowy Mountain: Pine Tree

Hot Desert: Cactus Plant

1. The structure and shape of trees develop according to the surroundings.

2. So that cacti can survive in snow and pine can survive in a desert.

3. Pine and other trees that grow in snowy mountains don't need water, they need snow to grow.

4. Cactus needs more food whereas pine doesn't require much food.

Q. Explain how desert plants and animals are able to survive in the hot and dry climates of the desert.

Q.

Why do the plants on a snowy cold mountain and the plants on a hot arid desert appear very different in structure and shape?

Snowy Mountain: Pine Tree

Hot Desert: Cactus Plant

1. Pine and other similar trees don't need water, they need snow to grow.

2. The structure and shape of trees develop according to the surroundings.

3. Cactus can survive in snow and pine can survive in desert.

4. There structure and shape is not different.

Q. Identify the adaptations of cacti that help them survive in deserts.

1. Spiny leaves
2. Fleshy stem
3. Thick stem
4. Widespread roots
5. Bright flowers
6. Fragrant sap
7. Deep roots
8. Modified seeds

Q.

Which of the following is not true regarding the adaptations seen in the stem of a cactus?

1. Spongy stem

2. Thin and flexible

3. Green and takes over functions of leaves

4. Thick waxy coating

Q. Which adaptation helps the cactus plant to minimise loss of water?

1. Spiny leaves
2. Broad leaves
3. Branched stem
4. Fibrous roots