CLASS X:IMPORTANT QUESTIONS: BIOLOGY

1.Name the gas which is a major component of biogas. Write its chemical formula too.
2. Name the organism(s) belonging to fourth trophic level in the food chain comprising of:
Snakes, Insects, Frogs, Plants, Hawks
3. Name the chemical compound which depletes ozone layer.
4. What is meant by DNA copying? Mention its importance in reproduction?
5. Write two advantages of vegetative propagation?
6. Why should fossil fuels be used judiciously? Write any two reasons.
7. Name the three `R’ s to save environment. Explain any one with the help of one example.
8. Draw the labelled diagram of female reproductive system. Name the organ which provides nutrition to embryo? Where is it located?
9. In human beings, the statistical probability of getting either a male or a female child is 50:50. Give reasons and explain with the help of diagram.
10. Differentiate between homologous and analogous organs. Give one example of each.
11. What are fossils? How is life of a fossil estimated ?
12. (a) Draw a labelled diagram of longitudinal section of flower
(b) Name the male and female reproductive part in a bi-sexual flower. Explain function of each in brief .
13. (a) Draw a labelled diagram of germination of pollen on stigma
(b) Explain the process of germination.
14. Write any two effects of Ozone depletion on our health.
15. Explain with example the importance of variation in the species
16. How is the process of binary fission in Amoeba different to that in Leishmania ?
17. Define water harvesting. List two traditional systems of water harvesting.
18. (a) Draw a neat labelled diagram of a germinated seed and label radicle, plumule and cotyledon .
(b) Mention function of each of these parts.
19. Name the organism Mendel used for his experiment. Explain about F1 and F2 progeny obtained by Mendel when he cross-bred the tall and the short varieties of the organism he experimented with.
20. What is meant by analogous organs and homologous organs ?
Identify the analogous and homologous organs amongst the following : Wings of a butterfly, wings of a bat, forelimbs of frog, forelimbs of a human.
21. How is sex of a new born determined genetically in human beings ?
22. (a) Specify the location of human testis in male reproductive system and write the advantage of it being present over there.
(b) Mention two roles of testis in reproductory system.
(c) Write two glands found in male reproductive pathway and specify their roles.
23. (a) Draw a neat diagram of human female reproductive system and label :
(i) Oviduct (ii) Ovary (iii) Uterus (iv) Cervix
(b) Mention the function of Uterus and Oviduct.