Answer :

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.

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