Morphology of Flowering Plants Test 24

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Morphology of Flowering Plants Test 24

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Weekly Quiz Competition

Question 1
1 / -0

Pneumatophores are useful in

A
Respiration

B
Transpiration

C
Guttation

D
Protein synthesis

Solution

Pneumatophores are usually root modifications which are seen in plants living in saline marshy environments. The adventitious roots in these plants have smalls pores called pneumatophores which are useful for respiration.
So, the correct option is A.
Question 2
1 / -0

Buttress roots are

A
Fleshy

B
Underground

C
Aquatic

D
Horizontal
Solution
Buttress roots are mainly found in trees of tropical rainforests. These roots spread horizontally, so they are able to cover a wider area for collecting nutrients.
They stay near the upper soil layer because all the main nutrients are found there.
So, the correct option is 'Horizontal'.
Question 3
1 / -0

Parasites absorb nourishment from host by

A
Haustoria

B
Clinging roots

C
Fibrous roots

D
Velamen roots
Solution
- Haustoria are root modifications that can penetrate the vascular structure of other plants. So, the parasitic plant absorbs nourishment by haustoria.
- The clinging roots found in the epiphytes help to fix the plant on the bark of another tree.
- Fibrous root systems are characteristic of monocots in which primary roots are short-lived and, therefore, as the plant develops, these roots are replaced by many fibre-like roots arising from the base of the stem.
- Velamen is found in aerial roots of orchids (epiphytes) covered by hygroscopic tissue. They absorb water from the atmosphere.
So, the correct option is 'Haustoria'.
Question 4
1 / -0

Velamen is a tissue found in

A
Parasites

B
All epiphytes

C
Aerial roots of some orchids$$/$$ Vanda

D
Halophytes
Solution
Answer: (C) Aerial roots of some orchids/Vanda.
Explanation:
Velamen is a multilayered tissue that is spongy in nature which covers the aerial roots of epiphytic plants such as orchids.
It helps in the absorption of water.
Hence, Velamen is a tissue that is found in the aerial roots of some orchids/vanda.
Question 5
1 / -0

Which is correct?

A
Orchids have palmate roots

B
Sweet Potato has root tubers

C
Pandanus has stilt roots

D
All of the above

Solution

A. Orchis has palmate roots because they give off palmate shape.
B. Sweet potato is said to have tuberous roots as it stores the food in its root making them swollen for perennation.
C. Pandanus has stilt roots because it has a weak stem so needs support.
So, the correct option is 'All the above'.
Question 6
1 / -0

Climbing roots occur in

A
Vanilla

B
Vanda

C
Pongamia

D
Taeniophyllum

Solution

Climbing roots occur in Vanilla plant because it is a climbing epiphyte where its roots are aerial and attach to a support. This is because of its weak stem which isn't equipped to stand upright.
So the correct option is 'Vanilla'.
Question 7
1 / -0

Penetrating roots of Cuscuta are

A
Haustoria

B
Stilt roots

C
Climbing roots

D
Assimilatory roots

Solution

Penetrating roots of Cuscuta are called haustoria because these are modifications of the root system so that they can absorb water and nutrients from the vascular structures of the host plant.
So, the correct option is 'Haustoria'.
Question 8
1 / -0

Clinging roots occur in

A
Trapa

B
Orchid

C
Screwpine

D
Podostemon

Solution

Clinging roots occur in orchid because orchids live on the branches of trees so their roots are modified to absorb water from the atmosphere by hanging freely in the air.
So, the correct answer is 'Orchid'.
Question 9
1 / -0

In hydrophytes

A
Root system is well developed

B
Vascular system is well developed

C
Root system is poorly developed

D
Vascular system is poorly developed

Solution

In hydrophytes, the root system is poorly developed because the plants are surrounded by water. So absorption by only roots cannot be done. So, as the function decreases its development also decreases.
So, the correct option is 'Root system is poorly developed'.
Question 10
1 / -0

Roots that hold horizontal branches of banyan tree in the air are

A
Thumb roots

B
Prop roots

C
Stilt roots

D
All the above

Solution

The roots that hold horizontal branches of banyan tree in air are prop roots. They are thick pillar like adventitious roots.
So, the correct answer is 'Prop roots'

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Morphology of Flowering Plants Test 24

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Morphology of Flowering Plants Test 24

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Question 1

Respiration

Transpiration

Guttation

Protein synthesis

Solution

Question 2

Fleshy

Underground

Aquatic

Horizontal

Solution

Question 3

Haustoria

Clinging roots

Fibrous roots

Velamen roots

Solution

Question 4

Parasites

All epiphytes

Aerial roots of some orchids$$/$$ Vanda

Halophytes

Solution

Question 5

Orchids have palmate roots

Sweet Potato has root tubers

Pandanus has stilt roots

All of the above

Solution

Question 6

Vanilla

Vanda

Pongamia

Taeniophyllum

Solution

Question 7

Haustoria

Stilt roots

Climbing roots

Assimilatory roots

Solution

Question 8

Trapa

Orchid

Screwpine

Podostemon

Solution

Question 9

Root system is well developed

Vascular system is well developed

Root system is poorly developed

Vascular system is poorly developed

Solution

Question 10

Thumb roots

Prop roots

Stilt roots

All the above

Solution

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