English Medium इयत्ता १० - CBSE Important Questions for Science

State the reasons, why carbon cannot

1. Lose four electrons to form C⁴⁺ cation and
2. Gain four electrons to form C^4- anion.

How does carbon overcome this problem to form compounds?

Write the chemical equation for the following:

Saponification Reaction

A squirrel is in a scary situation. Its body has to prepare for either fighting or running away. State the immediate changes that take place in its body so that the squirrel is able to either fight or run?

Name the gland and the hormone secreted by it in scary situations in human beings. List any two responses shown by our body when this hormone is secreted into the blood.

In the given diagram:

1. Name the parts labelled A, B, and C.
2. Write the functions of A and C.
3. Reflex arcs have evolved in animals? Why?

Name the parts A, B and C shown in the diagram and write their functions.

Name the parts A, B and C shown in the following diagram and state one function of each.

Name the parts labelled as A, B, C and D in the diagram given below:

Explain the term 'fertilisation'.

Draw a diagram of a pistil showing pollen tube growth into the ovule and label the following:

Pollen grain, male gamete, female gamete, ovary.

What is phototropism?

Describe an activity to demonstrate phototropism.

Differentiate between self-pollination and cross-pollination.

Give reason for the following:

Fertilization cannot take place in flowers if pollination does not occur.

Name the reproductive parts of an angiosperm. Where are these parts located? Explain the structure of its male reproductive part.

What is puberty?

State power of a lens S.I. unit.

Explain the following term related to spherical lenses:- aperture

Explain the following term related to spherical lenses: focal length

The laws of reflection hold true for ______.