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 Multiple Choice QuestionsMultiple Choice Questions

1.

Assertion : Death is regarded as the most important regulatory process on earth. 

Reason : It avoids overcrowding, caused continuous reproduction.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both the assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both the assertion and reason are false


A.

If both assertion and reason are true and reason is the correct explanation of assertion.

Death is regarded as the most important regulatory process on earth. It reduces the number of individuals in a population and avoids overcrowding caused by continuous reproduction.

Overcrowding due to reproduction is countered by death as the ultimate termination of functional life.


2.

Periyar sanctuary is located in

  • Madhya Pradesh

  • Kerala

  • Uttar Pradesh

  • Assam


B.

Kerala

Periyar sanctuary is located in Kerala. Important animals found here are elephant, tiger, wild bear, sloth bear, grey hornbill etc.


3.

Assertion : Living organisms are regarded as closed systems.

Reason : Energy of living organisms cannot be lost or gained from the environment.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both the assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both the assertion and reason are false.


D.

If both the assertion and reason are false.

Living organisms are regarded as open systems as they can lose or gain the mass or energy from the surrounding environment. All living organisms restore their lost energy either from the sunlight or indirectly from the food material.


4.

Assertion : Systematics is the branch of biology that deals with classification of living organism.

Reason : The aim of classification is to group the organisms in an orderly manner.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both the assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both the assertion and reason are false.


B.

If both the assertion and reason are true but reason is not the correct explanation of assertion.

Taxonomy or systematics is the branch of biology that deals with the classification of biological world of living organisms. The classification is the grouping of organisms in an orderly manner. This grouping is based upon similarities and dissimilarities.


5.

Assertion : Study of biology requires basic knowledge of chemistry and physics.

Reason : Living organisms are made up of atoms and molecules which follow chemical and physical laws.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both the assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both the assertion and reason are false.


A.

If both assertion and reason are true and reason is the correct explanation of assertion.

The advancement in the field of biology has reached to such an extent that it requires the basic knowledge of chemistry, physics and other basic sciences. It is a fact that living organisms are made up of atoms and molecules which follow chemical and physical laws. Therefore, knowledge of chemistry and physics is essential for studying biology.


6.

Enzymes are absent in

  • algae

  • plants

  • virus

  • bacteria


C.

virus

Virus is without necessary metabolic enzymes, hence, free virus are inert particles incapable of any vital activities and uses host machinery. Virus is regarded as obligate parasite and have characteristic of both living and non-livings.


7.

Kaziranga National Park is famous for :

  • Rhinoceros

  • Tiger

  • Asiatic lion

  • Nilgai


A.

Rhinoceros

Kaziranga National Park is famous for one horned Rhinoceros. It is situated at Sibsagar district in Assam.


8.

How many sperms are formed by four primary spermatocytes

  • 1

  • 4

  • 16

  • 32


C.

16

Spermatogenesis is the formation of sperm from a germ cell. Four spermatozoa are produced from a primary spermatocyte, therefore, 16 spermatozoa will be formed from four primary spermatocytes.


9.

Assertion : Senescence is the time when age associated defects are manifested.

Reason : Certain genes may be undergoing sequential switching on and off during one's life.

  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

  • If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false


A.

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

Process of ageing is called senescence.

 In humans, aging is associated with degenerative changes in the skin, bones, heart, blood vessels, lungs, nerves, and other organs and tissues. It is genetically controlled programme regulated by regulatory genes. Example, the great range of lifespans among different animal species from a few days in the fruit fly to more than 100 years in some tortoises. Scientists have recently learned how to double the lifespans of such laboratory organisms as roundworms and fruit flies through genetic manipulation, and mutant genes in mice have been observed to have a comparable effect in postponing ageing.


10.

Incomplete division of egg during cleavage is known as

  • meroblastic

  •  holoblastic

  • meridional

  • spiral


A.

meroblastic

In meroblastic cleavage, division occurs only in small amount of metabolically active cytoplasm, confined to the animal pole or peripheral region of egg. The yolk remains undivided. It is found in macrolecithal eggs. e.g. birds