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12th Class Biology Sample Paper

Biology - Sample Paper-2 Total Questions - 27 [Download]

1)

Where are sperms stored in the male?
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2)

Name the two vitamins produced by microbial fermentation.
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3)

Name the enzyme which is used for dissolving fungal cell wall.
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4)

Name the popular recent technique which is used for detecting the presence of pathogen/virus in an organism.
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5)

What do you understand by the term diapause?
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6)

(i) What are the symptoms of malaria?

(ii) Name the commonly used hormones present in contraceptive pills.

OR

State any two differences between spermatogenesis and oogenesis.

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7)

Give a brief account of biochemical evidences of evolution.
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8)

Differentiate between Repetitive DNA and Satellite DNA.
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9)

How is DNA isolated in purified form from a bacterial cell?
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10)

How is thermoregulation energetically expensive for small animals?
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11)

What is gametogenesis? Differentiate between isogamy and anisogamy.
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12)

What are the different methods of gamete transfer in different organisms?
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13)

Draw a well- labelled diagram of longitudinal section of a mature anatropous ovule.
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14)

What is Satellite DNA's? Explain in brief.
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15)

Write the various causes of genetic disorders in humans.

OR

Mention the salient features of Hugo de Vries theory of mutation. How do Hugo de Vries theory differs from Darwinism?

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16)

Haemophilia victims are mostly men. Very rarely women are affected by this disorder. Explain, why is it so.
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17)

(i) For which variety of Indian rice, patent was filed by a USA Company?

(ii) What are biofertilisers?

(iii) What would have happened if antibiotics were not discovered?

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18)

Write the names of two vector-borne diseases. Name their vectors and causative organisms.
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19)

What do you understand by the terms - (i) Callus, (ii) Micropropagation, (iii) Plant tissue culture
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20)

(i) What essential features must be present in a cloning vehicle?

(ii) Give each an example of vectors for cloning genes in plants and animals.

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21)

Write a brief account of genetically engineered insulin.
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22)

Define ecological pyramids and describe with examples, pyramids of number.
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23)

Write notes on the following:

(i) Food web

(ii) Xerarch

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Ankit was one of the best student in the class and loves to play hockey and also selected as captain of the school team for the district level tournament. He also does social work. He attended a blood donation camp to donate blood and come to know that he is HIV positive. He lost interest in games and refused to play or study. He went into mental depression and remained absent from school for a long time to avoid spreading AIDS to others. The Biology teacher visited his home and counselled him. Ankit was back at school and also played and won the tournament. Ankit then celebrated his victory with team-mates joyfully.

(i) What sense of responsibility did the Biology teacher exhibit?

(ii) A person detected to be HIV positive should be isolated in the society. Do you agree? Why or Why not?

(iii) How is AIDS not spread?

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Hybrid varieties of several of our food and vegetable crops are being extensively cultivated. However, plant breeders face a serious problem about their seeds. What is that and how it can be possible to solve this problem?

Describe the changes in the following organs in the different phases of the menstrual cycle

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What is mutation? Give the names of some mutagens. How mutations are significant in agriculture?

In man four types of blood groups A, B, AB and O are controlled by three alleles of a gene. What is the mechanism of inheritance of the blood group?

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27)

Explain the main effects of water pollution.

OR

Give an account of energy flow in an ecosystem.

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