How do Organisms Reproduce? — Class 10 Science PYQs

Identify the type of reproduction shown in the diagram given below :

Identify the correct statement for spirogyra, leishmania and hydra :

Draw a neat diagram to show germination of pollen on the female reproductive part of the flower. Name and label only the following parts :
(a) The part that receives the pollen grain.
(b) The structure that carries the male germ cell to reach the female germ cell.

(a) Given below are certain situations. Analyse each and describe its possible impact :
(i) A population of bacteria living in temperate waters whose temperature increased by global warming.
(ii) The sperm encounters the egg when it reaches the oviduct in human females.
(iii) Self pollination does not occur in a flower that contains only pistil.
(iv) Egg does not get fertilised in a human female.
(v) When the seed is placed under appropriate condition of water and air in the soil ?
OR
(b) Given below are certain situations. Analyse and describe what would happen when :
(i) Spores are liberated from blob-like structures of the bread mould?
(ii) Leaves of bryophyllum fall on wet soil ?
(iii) A pollen from different species land on the stigma of totally unrelated species ?
(iv) Copper-T is placed in the uterus of a human female ?
(v) Spirogyra breaks into smaller fragments upon maturation ?

The correct/true statement(s) for a bisexual flower is/are :
(i) They possess both stamen and pistil.
(ii) They possess either stamen or pistil.
(iii) They exhibit either self-pollination or cross-pollination.
(iv) They cannot produce fruits on their own.

Draw labelled diagrams to show different stages of budding in Hydra.

(a) (i) Write the functions of the following parts of human female reproductive system :
(I) Ovary
(II) Fallopian tube
(III) Uterus
(ii) State briefly two contraceptive methods used by human males.
OR
(b) (i) Differentiate between self-pollination and cross-pollination.
(ii) Identify A, B and C in the diagram given below and write one function of each.

Bryophyllum produces new plant through :

(a) Write one function each of the following, in a seed :
(i) Seed coat
(ii) Cotyledon
(iii) Radicle
(iv) Plumule
OR
(b) Write the main steps to culture yeast in the laboratory.

When a girl is born, the ovaries already contain thousands of immature eggs. On reaching puberty, some of these start maturing. One matured egg is released every month by one of the ovaries. The two oviducts unite into an elastic bag-like structure known as uterus.
(a) Write the site of fertilization in human female.
(b) How does the uterus prepare itself to receive and nurture the growing embryo ? Explain.
(c) (i) What happens when the egg is not fertilized ?
OR
(c) (ii) How does the developing embryo get nutrition from the mother's blood ? Explain.