Subject

Biology

Class

ICSE Class 12

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.
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 Multiple Choice QuestionsShort Answer Type

31.

Explain the C4 cycle of photosynthesis.

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32.

(a) Differentiate between apes and man with respect to the following characteristics: (i) Posture (ii) Cranium (iii) Brow ridges (iv) Locomotion

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33.

b) Define:

(i) Vestigeal organs

(ii) Variations

(iii) Neo–Darwinism

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34.

(a) State four characteristics of the Cromagnon man.

(b) Explain the basic postulates of Darwinism.

(c) Archaeopteryx is a connecting link between reptiles and birds. Justify the statement by giving two characteristics of each group.

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35.

(a) Persons suffering from G6PD deficiency are resistant to malaria. Explain.

(b) Define:

(i) Genetic Erosion    (ii) Bioinsecticides (iii) Antigen (iv) Psychosis

(c) Define Biofortification.

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36.

(a) List the activities of Community Health Services.

(b) Give three early diagnostic symptoms of cancer.

(c) Define: (i) Carrying capacity (ii) Implant (iii) Carcinoma

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 Multiple Choice QuestionsLong Answer Type

37.

(a) Give four differences between root apex and shoot apex.

(b) Explain the development of the different types of endosperms in angiosperms.

(c) Explain briefly: (i) Capillary water (ii) Osmosis (iii) Aeroponics

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38.

(a) Mention one role and one deficiency symptom of the following elements in plant nutrition:

(i) Phosphorus (ii) Iron (iii) Chlorine



 

Role

Deficiency symptom

Phosphorus

A constituent of cell membranes, nucleic acids and nucleotides, certain coenzymes and ATP, influences nitrogen metabolism used in phosphorylation of sugars in respiration.

Stunted growth chlorosis, dead necrotic areas on leaf.

Iron

Constituent of electron carriers and certain enzymes Ferradoxin acts as a activator for enzymes.

Interveinal chlorosis induces chloroplast disintegration.

Chlorine

Maintains electrical osmotic and anion cation balance across cell membrane, essential for 02 evolution in photosynthesis.

Chlorosis wilting of leaves, stunted root growth and reduced fruiting.

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39.

State the advantages and disadvantages of vegetative reproduction.

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40.

(a) What are tropic hormones ? Describe the feedback control of tropic hormones with an example.

(b) Explain the conduction of nerve impulse through a nerve fibre.

(c) Draw a labelled diagram of the T.S. of bone.

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