(a) Explain the role of three , organisms as biocontrol agents. (b) W

1.	(a) Explain the role of three , organisms as biocontrol agents. (b) What is the significance of BOD? (c) Given an example for fungus found in mycorrhia.
Answer» (a) The ladybird beetle is used to control aphids. Dragonflies are used to control mosquitoes. Dried spores of these to bacteria Bacillus thuringiensis are mixed with water and sprayed onto vulnerable plants such as brassicas and fruit trees. Their toxin is released in the gut of insect (butterfly) larvae which feed on the spores. This kills the caterpillars. Trichoderma species, a free-living fungus in the roots of many plants is used to control several plant pathogens. Baculoviruses like nucleo- polyhedrovirus are species specific and are used as biocontrol agents against insects and other arthropods. (b) It is a measure of organic matter present in water / sewage Or it indicates whether the water sample is polluted or not (c) Glomus.

(a) Explain the role of three , organisms as biocontrol agents. (b) What is the significance of BOD? (c) Given an example for fungus found in mycorrhia.

Answer»

(a) The ladybird beetle is used to control aphids. Dragonflies are used to control mosquitoes.

Dried spores of these to bacteria Bacillus thuringiensis are mixed with water and sprayed onto vulnerable plants such as brassicas and fruit trees. Their toxin is released in the gut of insect (butterfly) larvae which feed on the spores. This kills the caterpillars.

Trichoderma species, a free-living fungus in the roots of many plants is used to control several plant pathogens. Baculoviruses like nucleo- polyhedrovirus are species specific and are used as biocontrol agents against insects and other arthropods.

(b) It is a measure of organic matter present in water / sewage Or it indicates whether the water sample is polluted or not

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