Life Processes in Plants — Science STD 7 — Question

State rate of chemical reaction.

Out of the two given clocks, a pendulum clock or a quartz clock. Mention which of the clock between the given ones requires an electric cell for its working?

Can you get a real image at any distance of the object from the convex mirror?

Paheli asks, "Does it mean that heat will not be transferred, if the temperature of two objects is the same"?

Define menstruation.

Why cutting of wood is a chemical change?

Two organisms are good friends and live together. One provides shelter, water, and nutrients while the other prepares and provides food. Such an association of organisms is termed as:

How do water and minerals absorbed by roots reach the leaves?

Where is the bile produced? Which component of the food does it digest?

Give two examples of a chemical change.