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Posted By: prasanna Member Level: Gold Posted Date: 25 May 2008
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2005 CBSE bio-practice paper Question paper
Class X Biology
1. What is the name given to a set of unpaired chromosomes of an organism?
Answer :
2. What clue does the fossil Archeapteryx provide in regard to organic evolution?
Answer :
3. What is meant by ‘homologous organs’?
Answer :
4. Differentiate between biodegradable and non-biodegradable pollutants. Classify the following under the above two categories: DDT, paper, cotton cloth, plastics.
Answer :
5. Name any two organs that are homologous to human arm. To which category of organs would you place wings of birds and wings of insects?
Answer :
6. (a) Draw a labelled diagram of a Neuron. (6) Which part of the brain is responsible for
(i) Intelligence and memory. (ii) Adjustment of movement of posture?
Answer :
7. Name the types of sex chromosomes present in:
(i) Human male. (ii) Human female.
What will be the sex of the child produced if a sperm carrying ‘V chromosome fertilizes the egg? Name an insect in which similar type of sex determination takes place.
Answer :
8. Draw a labelled diagram of the longitudinal section of pistil of a flower. What will happen to the pollen of mango flower if it falls on the stigma of guava flower?
Answer :
9. Write the sequence of steps and processes in the primary and secondary treat¬ments of the sewage before it is passed into the final (tertiary) step.
Answer :
10. How do ii) temperature, (ii) water, and (iii) carbon dioxide affect the rate of photosynthesis? During which state of photosynthesis do the following occur:
(a) Synthesis of ATP and NADPH?
(b) Synthesis of Carbohydrates?
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