Nutrition in Plants — Science STD 7 — Question

Differentiate between two modes of transfer of heat, i.e. convection and conduction.

What are the components of an electric circuit?

While playing in a park, a child was stung by a wasp. Some elders suggested applying paste of baking soda and others lemon juice as remedy. Which remedy do you think is appropriate and why?

Why is chlorophyll important for the production of starch in plants?

Why MCBs are being used in place of fuses?

Classify the following as motion along a straight line, circular or oscillatory motion.
(a) Motion of your hands while running.
(b) Motion of a horse pulling a cart on a straight road.
(c) Motion of a child in a merry-go-round.
(d) Motion of a child on a see-saw.
(e) Motion of the hammer of an electric bell.
(f) Motion of a train on a straight bridge.

Discuss the significance of recycling metals.

How does respiration help in plant growth and energy supply?

A goat eats away all the leaves of a small plant (balsam). However, in a few days, new leaves could be seen sprouting in the plant again. How did the plant survive without leaves?

Differentiate between nutrients and nutrition.