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.
Advantages of vegetative propagation are:
How are the modes for reproduction different in unicellular and multicellular organisms ?
What is the effect of DNA copying which is not perfectly accurate on the reproduction process?
State one genetically different feature between sperms and eggs of humans. What is its consequence?
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?
Name the information source of making proteins in the cell. State two basic events in reproduction.
If a woman is using a copper-T will it help in protecting her from sexually transmitted diseases?
What is reproduction? What are its two types? Which one of the two confers new characteristics on the offsprings and how?
(a) What is fragmentation in organism?
Name a multicell-ular organism which reproduces by this method.
(b) What is regeneration in organism? Describe regeneration in Planaria with the help of a suitable diagram.
List the parts of human male reproductive system which contribute fluid to the semen. State two advantages semen offers to the sperms.
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?
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
“Variations that confer an advantage to an individual organism only will survive in a population.” Justify.
Name one sexually transmitted disease each caused due to bacterial infection and viral infection. How can these be prevented?
(a) In the human body what is the role of
(i) seminal vesicles, and (ii) prostate gland?
(b) List two functions performed by testis in human beings.
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.
Name the two types of germ-cells present in human beings. How do they structurally differ from each other? Give two differences.
(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?
What are sexually transmitted diseases?
Name four such diseases. Which one of them damages the immune system of human body?
Explain vegetative propagation with the help of two examples. List two advantages of vegetative propagation.
What does HIV stand for? Is AIDS an infectious disease? List any four modes of spreading AIDS.
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.
“DNA copies generated during reproduction will be similar but may not be identical to the original.” Justify this statement.
What is AIDS? Which microbe is responsible for AIDS infection? State one mode of transmission of this disease. Explain in brief one measure for the prevention of AIDS.
Describe in brief the role of (i) testis (ii) seminal vesicle, (iii) vas deferens, (iv) ureter and (v) prostate gland in human male reproductive system.
Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?