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Posted Date: 25 Sep 2008 Posted By: jawad Member Level: Gold
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2008 ICSE Biology sample paper 2008 Question paper
ICSE Sample Paper - 2008
Subject - Biology
Class - XII
BIOLOGY PAPER 1 (THEORY)
(Three hours)
Candidates are allowed additional 15 minutes for only reading the paper.They must not start writing during this time.Actual writing time is given at the head of the paper.
All working including rough work should be done on the same sheet as ,or adjacent to the rest of the answer
Answer all questions in Part 1 and any five in Part 2 choosing three questions from Section A and two questions
from Section B. The intended marks for each question is given in [ ]
Part 1 (20 marks)
(Answer all the questions)
Question 1
a) Give significant differences between the following [5]
i) Menarche and Menopause
ii) Neurogenic and Myogenic Heart
iii) Action and Absorption Spectra
iv) Primary Xylem and Secondary Xylem
v) Photoperiodism and Vernalisation
b) Answer the following [2½]
i) What is the total lung capacity of human lung
ii) What is meristematic tissue
iii) Name the instrument used to measure blood pressure
iv) Define germplasm
v) Name one cyanobacteria which is used as bio-fertiliser
c) Give the causal agents of the following diseases [2½]
i) Diptheria
ii) Chicken Pox
iii) Ascarsis
iv) Whooping Cough
v) Cholera
d) Give significant contributions of the scientists [2]
i) Hugo De-Vries
ii) Louis Pasteur
iii) Ronald Ross
iv) Hatch and Slack
e) Fill in the blanks with appropriate words [2½]
i) The formation of annual rings is due to the activity of _________________
ii) The technique of growing plants in nutrient solution is known as ___________________
iii) The hormone which controls the absorption of water is __________________
iv) During the transfer of carbon dioxide in blood carbon dioxide combines with deoxy haemoglobin to form_________________
v) The protein digesting enzymes are known as _________________
f) Give the most significant function/role of the following [2½]
i) Warburg Effect
ii) Villi
iii) B-Cells
iv) Stigma
v) Leg-Haemoglobin
g) Give reasons for the following [3]
i) The intracellular proteins of the gut are not digested by protein digesting enzymes
ii) C 2 cycle is not an entirely harmful cycle
iii) Patients with transplanted organs are given immunosuppresants
Part 2 (50 marks)
Section A
(Answer any three questions)
Question 2
a) Briefly describe the cytochrome pump theory for active absorption of minerals [4]
b) Give any two functions each of cytokinins and ethylene [4]
c) What is apoplastic and symplastic pathway? [2]
Question 3
a) Briefly describe the development of male gametophyte in angiosperms [4]
b) Give an account of C 4 cycle in plants with the help of schematic diagram [4]
c) A plant is exposed to radiations of red zone and then far red zone.Will the plant [2]
flower? Explain
Question 4
a) Discuss the deficiency symptoms of the following nutrients [4]
i) Boron ii) Nitrogen iii) Zinc iv) Phosphorous
b) With the help of a labelled diagram explain the structure of myofibril [4]
c) List one function of each of the following hormones [2]
i) Parathormone ii) STH
Question 5
a) Briefly describe how oxygen is transported in blood [4]
b) Distinguish between symapathetic and parasympathetic nervous system [3]
c) With the help of a graph briefly explain the phases of growth [3]
Question 6
a) Explain with a diagram Haversian system [4]
b) Give an account of the conduction of heart beat [4]
c) Define the following [2]
i) Implantation ii) Gestation Period
Section B
(Answer any two questions)
Question 7
a) Trace the steps involved in the evolutionary history of man [4]
b) Give an account of Oparin and Haldane's concept of origin of life [3]
c) What is sickle cell anaemia? Why has natural selection not eliminated it? [3]
Question 8
a) Give a brief account of Lamarck's theory of inheritance of acquired characters [4]
b) What do you mean by frame shift and inverse mutation [2]
c) What do you mean by speciation? State and explain its different types [4]
Question 9
a) Give important uses of [4]
i) Vasaka ii) Winged Bean iii) Quinine iv) Bael
b) Explain with diagram the different types of waves involved in EEG [4]
c) State four reasons for rapid population growth [2]
Question 10
a) Distinguish between antibody and interferon [2]
b) State two types of mental illness along with their symptoms and cure [4]
c) Briefly describe how tissue culture is carried out [4]
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