Biology | Study Mode

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Question 51
A

Indusium

B

Fronds

C

Son

D

Prothalls

Explanation

At certain seasons, large number of spore bearing bodies (sporandia) appear on the under surface of mature fronds. At first, theses are green, but they become brown as they mature. The sporangia are gathered into groups over the veins. Each group is called a sorus and each has a cover called an Indusium (A).


Correct option: A
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Question 52
A

3:1

B

1:3

C

2:1

D

1:2

Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: C
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Question 53
A
Spongy mesophyll
B
Root nodes
C
Stern internodes
D
Stem nodes
Explanation
Azobacter is found at the root nodules of Leguminous plant (B).

Correct option: B
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Question 54
A

Endodermal cells

B

Sieve tubes

C

Xylem vessels

D

Pericyclic fibres

Explanation

Companion cells are narrow cells density filled with cytoplasm. There is one beside each sieve tube (B).


Correct option: B
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Question 55
A
Trophic level
B
Niche level
C
Energy level
D
Feed level
Explanation
A food chain shows thee transfer of energy and nutrients from organism to organisms in a feeding pathway. A food chain involves at least two links and more organisms at the lower tropic level to the higher tropic level (A).

Correct option: A

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