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Q:

The hormone that helps plants respond to drought is

A) abscisic acid B) cytokinin
C) gibberellin D) ethylene  
 
Answer & Explanation Answer: A) abscisic acid

Explanation:

During drought, plants would be in scarcity for water. For ensuring the mineral loss of water through stomata, the plant starts to produce abscisic acid.

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Q:

The specificity of an antibody is due to

A) the variable portions of the H and L chains B) the L chains
C) its valence D) the H chains
 
Answer & Explanation Answer: A) the variable portions of the H and L chains

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Q:

Fishes have a ........ chambered heart.

A) Single B) Three
C) Four D) Two
 
Answer & Explanation Answer: D) Two

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Q:

Cod liver oil from fish is rich in which vitamin?

A) Vitamin A B) Vitamin D
C) Vitamin C D) Vitamin B
 
Answer & Explanation Answer: B) Vitamin D

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Q:

Some roots, called _________________, arise from an organ other than the radicle.

A) tap roots B) stilt roots
C) fibrous roots D) adventitious roots
 
Answer & Explanation Answer: D) adventitious roots

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Q:

Alveoli are balloon like structures within the ______.

A) lungs B) kidney
C) liver D) heart
 
Answer & Explanation Answer: A) lungs

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Q:

The male sex organs in a flower is the __________.

A) Zoospores B) stamen
C) pistil D) Chlorophyceae
 
Answer & Explanation Answer: B) stamen

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Q:

Blood is red in colour due to the presence of __________

A) Cytochrome B) Chlorophyll
C) Hemocyanin D) Haemoglobin
 
Answer & Explanation Answer: D) Haemoglobin

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