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Q:

Molecular clocks are based on the idea that _____.

A) On average neutral mutations arise at a constant rate B) Directional selection occurs at a constant rate
C) Mutations occur once every generation D) Molecules resonate at a certain frequency that can be measured
 
Answer & Explanation Answer: C) Mutations occur once every generation

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Q:

Plants utilise ________ from the atmosphere foe photosynthesis

A) oxygen B) nitrogen
C) Carbon dioxide D) hydrogen
 
Answer & Explanation Answer: C) Carbon dioxide

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Q:

Which feature of a plant helps to distinguish a monocot from a dicot?

A) pollination B) venation
C) vernation D) aestivation
 
Answer & Explanation Answer: B) venation

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Q:

___ has naked seeds.

A) Pinus B) Lemon
C) Carrot D) Wheat
 
Answer & Explanation Answer: A) Pinus

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Q:

Goitre is caused by the deficiency of ___________

A) Zinc B) Calcium
C) Iodine D) Chlorine
 
Answer & Explanation Answer: C) Iodine

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Q:

Accumulation of which one of the following in the leads to cramp?

A) Lactic acid B) Ethanol
C) Pyruvic acid D) Glucose
 
Answer & Explanation Answer: A) Lactic acid

Explanation:

Muscle cramping is a common problem encountered by athletes and non athletes alike. Defined as painful involuntary skeletal muscle contractions, cramps may be categorized as either non exercise related or exercise related. Traditionally, such cramping was believed to arise from dehydration, electrolyte imbalances (including magnesium, potassium and sodium),accumulation of lactic acid, or low cellular energy levels.

 

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Q:

Name the respiratory organs of insects

A) Skin B) Body Surface
C) Gills D) Tracheae
 
Answer & Explanation Answer: D) Tracheae

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Q:

Which acid is secreted by certain glandular cells in the stomach lining?

A) Hydrochloric  B) Ethanoic
C) Formic D) Nitric
 
Answer & Explanation Answer: A) Hydrochloric 

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