How do Organisms Reproduce? — Class 10 Science PYQs

Identify the mode of asexual reproduction in the following organism :

Which one of the following organism is represented by this diagram ?

Which one of the following organ is NOT a part of human female reproductive system ?

In which of the following organisms, multiple fission is a means of asexual reproduction ?

"Stability of DNA in a species is ensured during sexual reproduction." Justify the statement.

Name two types of germ cells present in human beings. List two structural differences between the two.

(a) In angiosperms why fertilisation cannot take place in flowers if pollination does not take place ? Where is zygote located in a flower after fertilisation ? What does it develop into ?
(b) Write the names of those parts of a flower which serve the same function as the following do in animals :
(i) testis (ii) ovary

Explain the events that take place once a sperm reaches the oviduct till it becomes a foetus. Write the role of placenta in pregnancy.

(A) (i) Name three techniques/devices used by human females to avoid pregnancy. Mention the side effects caused by each.
(ii) What will happen if in a human female (a) fertilisation takes place, (b) an egg is not fertilised ?
OR
(B) (i) Draw a diagram showing spore formation in Rhizopus and label the (a) reproductive and (b) non-reproductive parts. Why does Rhizopus not multiply on a dry slice of bread ?
(ii) Name and explain the process by which reproduction takes place in Hydra.

Asexual reproduction involves a single parent to produce offsprings without the formation of gametes. It occurs by the following ways : Fission, Budding, Fragmentation, Spore formation and Regeneration. In one of the methods like regeneration, Planaria A is cut horizontally into three pieces - L, M and N and Planaria B is cut vertically into two equal halves - O and P.

(a) Which of the cut pieces of the two Planaria could regenerate to form a complete organism ?
(b) Give an example of another organism which follows the same mode of reproduction as Planaria.
(c) What is the meaning of 'development' in regeneration ?

OR

(c) Differentiate between regeneration and fragmentation.