Question 1

Which of the following nutrients is supplied by air to plants?

Accepted Answer

Carbon is supplied by carbon dioxide present in the air, making it one of the essential nutrients obtained from the atmosphere alongside oxygen.

Question 2

Which of the following is a Kharif crop?

Accepted Answer

Paddy (rice) is a Kharif crop grown during the rainy season from June to October in India.

Question 3

Which of the following is a Rabi crop?

Accepted Answer

Wheat is a Rabi crop grown during the winter season from November to April.

Question 4

Which method is commonly used for crop improvement?

Accepted Answer

Hybridization is the crossing of genetically dissimilar plants to improve crop variety characteristics.

Question 5

Which of the following is a macro-nutrient for plants?

Accepted Answer

Nitrogen is required by plants in large quantities, making it a primary macro-nutrient.

Improvement in Food Resources — NCERT Class 9 Science Important Questions & Revision Notes