English Medium Class 10 - CBSE Important Questions

Answer the following question.
What happens when methane compound burns in oxygen?

Write the chemical equation for the following:

Oxidation of ethanol

"Carbon prefers to share its valence electrons with other atoms of carbon or with atoms of other elements rather than gaining or losing the valence electrons in order to attain noble gas configuration." Give reasons to justify this statement.

Consider the carbon compounds having following molecular formula:

(i) C₃H₆ (ii) C₃H₈ (iii) C₄H₆ (iv) C₆H₆ (v) C₆H₁₂

1. State the number of double covalent bonds present in C₃H₆.
2. Write the formula of first member of the homologous series to which the carbon compound C₄H₆ belongs.
3. Which one of the above compounds forms a ring structure of carbon atoms?
4. Identify, which of the above compounds, is a member of alkane series.

"Two different forms of carbon - diamond and graphite have different structure and very different physical properties even though their chemical properties are same." Explain why.

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

Describe the structure of nephrons.

Describe in brief how urine is produced in the human body.

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.