Match the items in Column ‘A’ and Column ‘B’ and choose correct answer.

The correct answer is:

A. Lady bird – iii. Aphids

Explanation: Lady bird is a red and black coloured beetle which feeds on small insects known as aphids. Ladybirds are natural bio controllers.

B. Mycorrhiza – iv. Glomus

Explanation: Glomus is a mycorrhizal fungus which forms a symbiotic relationship with the roots of the plants.

C. Biological control – ii. Trichoderma

Explanation: Trichoderma helps in controlling the plant diseases by various mechanisms such as enzyme secretion, competitive inhibition and antibiosis.

D. Biogas - i. Methano bacterium

Explanation: Methanogens are methane releasing bacteria.The main constituent of biogas is methane.