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Q:

Which of the following mountains are the oldest according to geological history?

A) Nilgiris B) Satpura Range
C) Vindhyas D) Aravalli
 
Answer & Explanation Answer: D) Aravalli

Explanation:

According to geological history, the important mountains of india arranged in the order of age starting from the oldest are the Aravallis , the westerm Ghats, Vindhya and Satpura, the Nilgiris , and the Himalayas.

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Filed Under: Indian Geography

Q:

What is the most important geographic use of the Himalayas to India?

A) prevention of invasions B) valuable source of timber
C) They prevent the monsoons from crossing to the north and also serve as a reservoir of water from which our perennial rivers flow D) They protect India from the icy cold north winds
 
Answer & Explanation Answer: C) They prevent the monsoons from crossing to the north and also serve as a reservoir of water from which our perennial rivers flow

Explanation:

(a) refers to political importance and (b) to economic importance. Out of (c) and (d), (c) is more important.

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Filed Under: Indian Geography

Q:

Cretinism is due to the disorder of the glands

A) Thymus B) Parathyroid
C) Thyroid D) Adrenal
 
Answer & Explanation Answer: C) Thyroid

Explanation:

Cretinism is a disease caused by hypothyroidism (less thyroxine formation) . The symptoms of the disease are retardation of mental, physical and sexual developments. potbelly, protruding tongue, dry skin etc are also indicative of this disease.

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Filed Under: Biology

Q:

Oparin is known for his hypothesis on

A) origin of species B) origin of life
C) one germ one disease D) one gene one enzyme
 
Answer & Explanation Answer: B) origin of life

Explanation:

A. J . Oparin was the first to propose the origin of life from inorganic chemical atoms like Oxygen, Hydrogen, Nitrogen and Carbon.

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Filed Under: Biology

Q:

The biogenetic law was proposed by

A) Alfred Russel Wallace B) Charles Darwin
C) Ernst von Haeckel D) Lamarck
 
Answer & Explanation Answer: C) Ernst von Haeckel

Explanation:

The biogenetic law states that ontogeny (study of development) repeats phylogeny (origin from previous group of racial history), The young one of the frog namely the tadpole is like a fish cosidered to be ancestral to frog.

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Filed Under: Biology

Q:

Lamarck's theory of inheritance of acquired characters was challenged by 

A) August Weismann B) Hugo de Vries
C) Herbert Spencer D) Carl Linnaeus
 
Answer & Explanation Answer: C) Herbert Spencer

Explanation:

August Weismann cut off the tails of mice for 21 successive generations and still they produced generation after generation of only tailed young ones. So he concluded that acquired characters are not inherited.

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Filed Under: Biology

Q:

Organisms that live in the deep sea are mainly

A) Herbivores B) Carnivores
C) Detritivores D) None of the above
 
Answer & Explanation Answer: C) Detritivores

Explanation:

Deep sea animals cannot produce food as there is no light. They have to depend upon the fall out of organic debirs raining down on them from surface layers. Hence they are detritivores.

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Filed Under: Biology

Q:

The phenomenon of summer sleep by animals is called

A) hibernation B) aestivation
C) laziness D) lethargy
 
Answer & Explanation Answer: B) aestivation

Explanation:

Aestivation is summer sleep. Many organisms like the snails do not find it comfortable in summer. They withdraw and lead a life with reduced BMR (basic Metabolic Rate) in a state of  dormancy.

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Filed Under: Biology