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ICSE Guess > ICSE Papers > Question Bank > Class X > 2008 >Biology

Question 1

(d). State whether the following statements are 'True' or 'False'. If 'False' rewrite the correct form of the statement by only changing the last word of the statement.[5]

1. The alpha cells of the pancreas secrete insulin.
2. Duplicated chromosomes remain attached at a point termed
   centrosome.
3. The number of pairs of autosomes in man is 22.
4. Penicillin obtained from a fungus is an example of an antibody.
5. Plants that manufacture their own food are termed heterotrophs.

Question 1

(e) Given below is an example of a particular structure and its special functional activity. e.g., Glomerules and ultra filtration. On a similar pattern complete the following:[5]

1. Corpus luteum and _______.
2. Iris of the eye and _______.
3. Seminal vesicle and _______.
4. Phloem and _______.
5. Eustachian tube and _______.

Question 1

(f). Given below is an experimental set up to study a particular process: [5]

1. Name the process being studied.
2. Explain the process named in (i) above.
3. Why is the pot covered with a plastic sheet?
4. Mention one way in which this process is beneficial to the
   plant.
5. Suggest a suitable control for this experiment.

Question 1

(g). Given below are incomplete explanations of certain biological rocesses terms where a key word has been left out. Rewrite the completed planation by inserting the key word in the space indicated by '^'.[5]

1. Birth rate is the number of '^' births per thousand of the population per year.
2. Photolysis is the splitting of water molecules into Hydrogen ions and Hydroxyl ions in the presence of '^' and light.
3. Vaccine is a preparation consisting of '^' microbes which help to build immunity in the human body.
4. Osmosis is the movement of water molecules from its region of high concentration to its region of low concentration through a '^'
   membrane.
5. Antiseptics are chemical substances applied to the '^' to destroy or prevent the growth and multiplication of harmful microbes.

Question 1

(h). Briefly explain the following terms:[5]

1. Destarched plant.
2. Phenotype.
3. Death rate
4. Power of accommodation of the eve.
5. Natural immunity.