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Motion and time

Which of the following are not correct?
(i) The basic unit of time is second.
(ii) Every object moves with a constant speed.
(iii) Distances between two cities are measured in kilometres.
(iv) The time period of a given pendulum is constant.
(v) The speed of a train is expressed in m/h.

04/11/2024

Science

7th

Motion and time

Classify the following as motion along a straight line, circular or
oscillatory motion:
(i) Motion of your hands while running.
(ii) Motion of a horse pulling a cart on a straight road.
(iii) Motion of a child in a merry-go-round.
(iv) Motion of a child on a see-saw.
(v) Motion of the hammer of an electric bell.
(vi) Motion of a train on a straight bridge.

04/11/2024

Science

7th

Reproduction in plants

Tick () the correct answer:
(a) The reproductive part of a plant is the
(i) leaf (ii) stem (iii) root (iv) flower
(b) The process of fusion of the male and the female gametes is called
(i) fertilisation (ii) pollination
(iii) reproduction (iv) seed formation
(c) Mature ovary forms the
(i) seed (ii) stamen
(iii) pistil (iv) fruit
(d) A spore producing organism is
(i) rose (ii) bread mould
(iii) potato (iv) ginger
(e) Bryophyllum can reproduce by its
(i) stem (ii) leaves
(iii) roots (iv) flower

04/11/2024

Science

7th

Reproduction in plants

Match items in Column I with those in Column II:
Column I Column II
(a) Bud (i) Maple
(b) Eyes (ii) Spirogyra
(c) Fragmentation (iii) Yeast
(d) Wings (iv) Bread mould
(e) Spores (v) Potato
(vi) Rose

04/11/2024

Science

7th

Reproduction in plants

Describe the various ways by which seeds are dispersed.

04/11/2024

Science

7th

Reproduction in plants

How does the process of fertilisation take place in flowers?

04/11/2024

Science

7th

Reproduction in plants

Explain the difference between self-pollination and cross-pollination.

04/11/2024

Science

7th

Reproduction in plants

Sketch the reproductive parts of a flower.

04/11/2024

Science

7th

Reproduction in plants

State the main difference between asexual and sexual reproduction.

04/11/2024

Science

7th

Reproduction in plants

Explain what you understand by sexual reproduction.

04/11/2024

Science

7th