What is reproduction? What are its two types? Which one of the two confers new characteristics on the offsprings and how?
Reproduction is the process of producing new individuals of the same species by existing organisms of a species, z.e. parents. Its two types are: Asexual reproduction and Sexual reproduction.
Sexual reproduction confers new characteristics on the offspring due to variation in DNA copying.
What is the effect of DNA copying which is not perfectly accurate on the reproduction process?
How are the modes for reproduction different in unicellular and multicellular organisms ?
Which of the following is not a pan Of the female reproductive system in human beings ?
(a) Ovary
(b) Uterus
(c) Vas deferens
(d) Fallopian tube
State one genetically different feature between sperms and eggs of humans. What is its consequence?
a) List any four reasons for adopting contraceptive methods.
(b) If a woman is using Copper-T, will it help in protecting her from sexually transmitted diseases? Why?
Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
“DNA copies generated during reproduction will be similar but may not be identical to the original.” Justify this statement.
List two advantages of practising vegetative propagation in plants. Select two plants raised by this method from the list given below:
Banana, Gram, Pea, Rose, Tomato, Wheat.
State in brief the changes that take place in a fertilised egg (zygote) till birth of the child in the human female reproductive system. What happens to the egg when it is not fertilised?
List any four reasons for vegetative propagation being practised in the growth of some type of plants.
Name one sexually transmitted disease each caused due to bacterial infection and viral infection. How can these be prevented?
(a) Draw a diagram showing germination of pollen on stigma of a flower.
(b) Label pollen grain, male germ- cells, pollen tube and female germ-cell in the above diagram.
(c) How is zygote formed?
Draw a diagram of a human female reproductive system and label the part
(i) that produces egg
(ii) where fusion of egg and sperm take place
(iii) where zygote is implanted
What happens to human egg when it is not fertilised?
Explain vegetative propagation with the help of two examples. List two advantages of vegetative propagation.
What are sexually transmitted diseases?
Name four such diseases. Which one of them damages the immune system of human body?
If a woman is using a copper-T will it help in protecting her from sexually transmitted diseases?
Differentiate between ‘self-pollination’ and ‘cross-pollination’. Describe double fertilisation in plants.
What is reproduction? What are its two types? Which one of the two confers new characteristics on the offsprings and how?
(a) Explain the role of placenta in the development of human embryo.
(b) Give example of two bacterial and two viral sexually transmitted diseases. Name the most effective contraceptive which prevents spread of such diseases.
Explain the following methods of contraception giving one example of each:
(i) Barrier method
(ii) Hormonal imbalance method
(iii) Surgical method.
Name an organism which reproduces by spore formation. List three conditions favourable for spores to germinate and grow.
Write the full form of DNA. Name the part of the cell where it is located. Explain its role in the process of reproduction of the cell.