All the food chains begin with green plants.

Give biological explanation

Name the two Presidents under whom the first two sessions of the Indian National Congress were held.

Name the particles present in: Non- electrolyte

Name the following: A by-product of sugar industry which is used in the manufacture of wax and shoe polish.

Copper sulphate solution reacts with sodium hydroxide solution to form a precipitate of copper hydroxide according to the equation:

 2NaOH + CuSO₄ → Na₂SO₄ + Cu(OH)₂ ↓

(i) What mass of copper...

Give a reason for each of the following: Mawsynram receives the highest average annual rainfall.

When an ovum gets fertilized, menstrual cycle stops temporarily in a woman.

Give scientific reasons.

K, Pb, Ca, Zn. (In the increasing order of the reactivity)

When can the Speaker of the Lok Sabha cast his vote?

Explain briefly the term ‘Court of Record’ with reference to the High Court.

With reference to the terms Mechanical Advantage, Velocity Ratio and efficiency of a machine, name and define the term that will not change for a machine of a given design.

Name the gas that is produced in - Action of dilute hydrochloric acid on sodium sulphide

Which one of the following is a Greenhouse gas

1. Oxygen
2. Methane
3. Sulphur dioxide
4. Nitrogen

(i) Define moment of force.

 (ii) Write the relationship between the SI and CGS unit of moment of force.

The diagram given below represents a plant cell after being placed in a strong sugar solution. Study the diagram and answer the questions that follow: 

1. What is the state of the cell shown in the
...

Mention two steps taken by the government to boost agricultural production in India