Onion is cultivated by transplanting seedlings.

Organic farming is a production system of crops which avoids the use of synthetic and chemical inputs like fertilizers, pesticides, growth regulators and livestock feed additives.

The important crop of Barak valley is jute, as Barak valley is situated in Assam. The temperature of the valley varies from 25° to 30°C and rainfall varies from 100 to 200 cm, which is ideal for jute cultivation.

Coffee cultivation in Sri Lanka was abandoned because of the disease leaf rust, which affects the fruit and leaf of coffee. The causative fungus is Hemilein Vastarix.

Option 1 is incorrect because tapioca is not an important crop of Kerala.

Wheat is a temperate region crop. Thus, it requires moderate temperature and moderate rainfall. Temperature should not exceed above 20°C and rainfall should be between 50-100 cm along with a frost-free growing season.

Both assertion and reason are true and the reason is the correct explanation of assertion. Bacillus thuringiensis is the bacterium which is used in Bt gene of cotton. Bt cotton is insect resistant.

Both assertion and reason are correct and the reason is the correct explanation of the given assertion. Chile is the largest copper producer in the world. 35% of the total global production comes from Chile and the major deposit is porphyry copper.

Due to availability of fertile alluvial soil, intensive agricultural practice was possible in the Nile valley and Islands of Java. So, there is high density of population in these regions.

Assertion is true, but reason is false. The western coast receives more rainfall than the eastern coast, but the temperature range of 20-27°C, heavily-clayed soil quality and rainfall are the factors found in Eastern coast which are more suitable for rice cultivation.

India is the original home of cotton plant and India ranks number one in the world, accounting for 20% of the total area planted under cotton in the world. The cotton hybrid variety H–4 was the first in the world. Raj–16, Dhanalaxmi and Fateh are the varieties which were developed in India.

Arjun and Sonalika are hybrid varieties of wheat produced by Indian Council of Agricultural Research.