- Crop Production & Management
- Microorganisms – Friends & Foe
- Synthetic, Fibers & Plastic
- Materials – Metals and Non Metals
- Combustion and Flame
- Conservation Of Plants And Animals
- Coal & Petroleum
- Cell Structure And Functions
- Reproduction In Animals
- Reaching The Age Of Adolescence
- Force And Pressure
- Chemical Effects Of Electric Current
- Some Natural Phenomena
- Stars And The Solar System
- Pollution Of Air And Water
- Question Bank – Chapter 1 – Crop Production & Management
- Question Bank – Chapter 2 – Microorganisms
- Question Bank – Chapter 3 – Synthetic Fibres and Plastics
- Question Bank – Chapter 4 – Metals and Non Metals
- Question Bank – Chapter 5 – Coal & Petroleum
- Question Bank – Chapter 6 – Combustion and Flame
- Question Bank – Chapter 7 – Conservation of Plants and Animals
- Question Bank – Chapter 8 – Cell Structure & Functions
- Question Bank – Chapter 9 – Reproduction
- Question Bank – Chapter 10 – Reaching the age of adolescence
- Question Bank – Chapter 11 – Force and Pressure
- Question Bank – Chapter 12 – Friction
- Question Bank – Chapter 13 – Sound
- Question Bank – Chapter 14 – Chemical Effects of Electric Current
- Question Bank – Chapter 15 – Some Natural Phenomena
- Question Bank – Chapter 16 – Light
- Question Bank – Chapter 17 – Stars and Solar System
- Question Bank – Chapter 18 – Pollution of Air & Water
Question Bank – Chapter 9 – Reproduction
Q1. Explain the importance of reproduction in organisms.
Ans. .Reproduction is very important as it ensures the continuation of similar kinds of individuals, generation after generation, it is essential for the continuation of a species
Q2. why do hen lays eggs?
Ans. Internal fertilization takes place in hens also. But, Soon after fertilization, the zygote
divides repeatedly and travels down the oviduct then many protective layers are formed around it.
Q3. What is Sexual reproduction?
Ans. Reproduction beginning from the fusion of male and female gametes is called sexual reproduction
Q4. Describe the the process of fertilization in human beings.
Ans. When sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of the egg and the sperm is called fertilization
Q5. What is external fertilization?
Ans. Fertilization in which the fusion of a male and a female gamete takes place outside the body of the female is called external fertilization.
Q6. Where does development of embryo take place in external fertilization?
Ans. In animals which undergo external fertilization, development of the embryo takes place outside the female body. The embryos continue to grow within their egg coverings. After the embryos develop, the eggs hatch.
Q7. Give the difference between a zygote and a foetus
Ans. The zygote is fertilized egg, it divides repeatedly to give rise to a ball of cells, while foetus is multicellular and it has small body parts such as hands, legs, head, eyes, ears
Q8. Define asexual reproduction. Describe two methods of asexual reproduction in animals.
Ans. Reproduction in which single parent is involved is called asexual reproduction, budding in hydra and binary fission in amoeba are asexual reproductive methods.
Q9. In which female reproductive organ does the embryo get embedded?
Ans. The embryo gets embedded in the wall of the uterus.
Q10. What is metamorphosis? Give examples.
Ans. The transformation of the larva into adult through drastic changes is called metamorphosis. Development of tadpole in frog and pupa into silkworm.
Q11. Does ovum appear to be a single cell? Which animal have largest egg?
Ans. The female gamete ova is a complete cell egg, they are very small in humans, Ostrich egg is the largest one.
Q12. What purpose does the tail in a sperm serve?
Ans. Tail of Sperm helps it to swim in water as well as in uterus to reach the eggs.
Q13. Name the reproductive parts in humans ?
Ans. The male reproductive organs include a pair of testes, two sperm ducts and a penis and the female reproductive organs are a pair of ovaries, oviducts and uterus .
Q14. What do you understand by term oviparous and viviparous?
Ans. Those animals which lay eggs are called oviparous animals. Those animals which lay eggs are called oviparous animals
Q.15 What is cloning ? Name the animal first cloned, Is it beneficial for human ?
Ans. Cloning is the production of an exact copy of a cell, any other living part, or a complete organism. Doctors cloned successfully a sheep named Dolly , it may help in repairing of organs ruptured in accidents.
- Define an embryo?
- How is it different from zygote and foetus?
- Which type of fertilization occurs in human beings ?
- How is human embryo development different from development of a hen’s embryo?
- Define metamorphosis with suitable examples.
- How did cloning experiments begun? Is cloning safe and absolutely successful?