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

Pahell wants to know why ruminants cannot chew food properly at the time they take it in?

Classify the given motion:

Motion of your hands while running.

• straight line motion

• circular motion

• oscillatory motion

Nitrogen is an essential nutrient for plant growth. But farmers who cultivate pulse crops like green gram, bengal gram, black gram, etc. do not apply nitrogenousfertilisers during cultivation. Why?

Why is camouflage important for animals?

Why does only a small area experience a total solar eclipse while lunar eclipses are visible over a larger area?

Insects and leaves of plant have pores through which they exchange gases with the atmosphere. Can you write two points of difference between these pores with respect to their position, number and extension into the body?

How heat and temperature of substance are related to each other.

How can we use speed to estimate time in daily life activities?

What type of motion is shown by a person running at a uniform speed on a straight road? Explain.

Explain how soil treatment helps plants grow better.