Exploring Substances: Acidic, Basic, and Neutral — Science STD 7 — Question

Define excretion.

Why is it dangerous to look at a solar eclipse without protection?

Give the form of energy that produces the sensation of vision.

The anther of flower contains pollen sacs that produce ____________.

What is respiration?

Kidneys are the major excretory organs in humans. How will the waste products released will be excreted out if the kidneys are damaged or unfunctional?

Explain why are concave and convex mirrors called spherical mirrors.

Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the waste of a factory in their village is flowing into the pond which probably caused the fish to die. If the factory waste is acidic in nature, how can it be neutralised?

How does exchange of gases take place in the plants?

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