CBSE Class 10 Science Chapter 8 How do Organisms Reproduce Very Short Answer Questions

CBSE Class 10 Science Chapter 8  How do Organisms Reproduce Very Short Questions and Answers

Question 1. Where is DNA found in a cell?
Answer: Genes/Chromosomes

Question 2. Why cannot all multicellular organisms divide cell-by-cell like spirogyra?
Answer:

The higher multicellular organisms have differentiation of structure and function, unlike spirogyra in which all the cells are similar and independent units.

Question 3. Name the two plants which are grown using the plant tissue culture method.
Answer:

1. Orchids
2. Asparagus

Question 4. Name some plants which are usually propagated by cutting method.
Answer: Rose, cactus, sugarcane, pineapple

Read and Learn More CBSE Class 10 Science Very Short Answer Questions

Question 5. What is the function of pollen grains in flowers?
Answer: Pollen grains fertilise the egg cells present in the embryo sac of an ovule.

Question 6. State an advantage of vegetative propagation.
Answer:

This method can be practised for growing such plants which usually do not produce seeds or produce non-viable seeds.

Question 7. Name the type of cells which undergo regeneration.
Answer:

Specialised cells are called regenerative cells which can proliferate and make a large number of cells.

Question 8. Name two organisms having the ability to regenerate.
Answer: Hydra and Planaria

Question 9. Name two plants that reproduce through spores.
Answer: Mushrooms and ferns

Question 10. State how the copper-T serves as an effective contraceptive device.
Answer:

Copper-T is placed inside the uterus by a doctor, which prevents implantation in the uterus.

Question 11. How can the chromosomes be identified?
Answer: Chromosomes can be seen as thread-like structures when a cell divides.

Question 12. List two functions performed by ovaries in a human female.
Answer:

1. Production of ovum (gamete).
2. Secretion of female hormones (estrogen and progesterone).

Question 13. Why is DNA copying an essential part of the process of reproduction?
Answer:

DNA is an essential part because errors in DNA copying lead to variation which not only gives survival advantage to an organism but also leads to evolution.

Question 14. Why is the temperature of the scrotal sac 2°C less than the body temperature?
Answer:

It is less because testes require a temperature of 2°C less than the body temperature for the production of sperins.

Question 15. Which group of plants shows double fertilisation?
Answer: Angiosperms

Question 16. What happens during pollination?
Answer: Pollen grains from stamen get transferred to carpels.

Question 17. Mention one physiological advantage of grafting quality roses on the wild rose stock.
Answer:

The rose stock is derived from a plant resistant to diseases and pests and is efficient in the absorption of water and minerals.

Question 18. Why is sexual reproduction considered to be superior to asexual reproduction in terms of evolution?
Answer: Sexual reproduction is a source of variation which ensures the survival of the species.

Question 19. Why is regeneration considered a method of reproduction?
Answer:

Regeneration is considered a method of reproduction because an entirely new organism can be made from its fragmented body.

Question 20. Write one example of a plant showing vegetative propagation by leaves.
Answer: Bryophyllum

Question 21. What is the significance of the sexual mode of reproduction?
Answer: It promotes variation in organisms.

Question 22. Regeneration is not possible in all types of animals. Why?
Answer:

Regeneration is carried out by specialised cells. The organisms which have those cells only can show regeneration.

Question 23. What happens if the egg is not fertilized?
Answer: Menstruation occurs, i.e., blood and mucus come out through the vagina.

Question 24. Which part becomes a new plant in vegetative propagation?
Answer: Root, stem and leaves

Question 25. What is the advantage of reproducing through spores?
Answer:

In the form of a cyst, it can survive in adverse conditions. Easy dispersal through wind is possible as they are more in number and light in weight.

Question 26. What is reproduction?
Answer:

Reproduction is a process of producing new individuals of the same species by existing organisms, i.e., parents.

Question 27. Which is the most basic event in reproduction?
Answer: Creation of a DNA copy.

Question 28. Differentiate between pollen grain and ovule.
Answer: Pollen grain contains male gametes in plants and ovule contains female gametes.

Question 29. Why is vegetative propagation practised for growing some plants?
Answer: Vegetative propagation is used for growing some plants which do not produce viable seeds.

Question 30. Differentiate between germination and fertilization.
Answer:

1. Germination-Development of the embryo into a seedling.
2. Fertilisation-Fusion of male and female gametes.