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Q:

Polynucleotide chain of DNA contains

A) a nitrogenous base, deoxyribose sugar and phosphate group B) a nitrogenous base, ribose sugar and phosphate group
C) deoxyribose sugar, ribose sugar and phosphate group D) a nitrogenous base and phosphate group only
 
Answer & Explanation Answer: A) a nitrogenous base, deoxyribose sugar and phosphate group

Explanation:

The two DNA strands are called polynucleotidesbecause they are composed of simpler monomer units called nucleotides. Eachnucleotideis composed of one of four nitrogen-containingnucleobases (cytosine, guanine, adenine or thymine), a sugar called deoxyribose, and a phosphate group.

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Q:

What is the function of guard cells of stomata?

A) Opening of stomata only B) Closing of stomata only
C) Both opening and closing of stomata D) Neither opening nor closing of stomata
 
Answer & Explanation Answer: C) Both opening and closing of stomata

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Q:

By which process substance like carbon dioxide or oxygen can move across the cell membrane?

A) Plasmolysis B) Sedimentation
C) Diffusion D) Transpiration
 
Answer & Explanation Answer: C) Diffusion

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Q:

The yellow colour of human urine is due to

A) Bile Salts B) Cholesterol
C) Lymph D) Urochrome
 
Answer & Explanation Answer: D) Urochrome

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Q:

Evaporation of water from leaves of a plant is called

A) Transpiration B) Respiration
C) Perspiration D) Evaporation
 
Answer & Explanation Answer: A) Transpiration

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Q:

Gaseous exchange takes place in leaves through tiny pores for the purpose of photosynthesis. What are these pores?

A) Chloroplast B) Stomata
C) Chlorophyl D) Vacuole
 
Answer & Explanation Answer: B) Stomata

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Q:

Crabs belongs to the phylum

A) Mollusca B) Cnidaria
C) Arthropoda D) Platyhelminthes
 
Answer & Explanation Answer: C) Arthropoda

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Q:

The hardest part of the body is ______.

A) Bones B) Tooth Enamel
C) Skull D) Spinal Cord
 
Answer & Explanation Answer: B) Tooth Enamel

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