3. (a) Write two uses of fertilisers.
4. What are weeds? How can we control them?
us.
(a) Draw a labelled diagram of Penicillium.
(b) Who discovered the bacterium which causes anthrax disease?
(b) What is meant by harvesting? By which instrument harvesting is done?
Ans. la They are used to booxiding additional nutrisi
2. They are added to improve the eld of the che
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1) They are used to providing additional nutrients to the plants.
They are added to improve the yield of the crops.
4) ANSWER
Weeds are unwanted and uncultivated plants that grow with crops and compete with crops for nutrients and can also cause crop toxification. Weeding is removal of weeds and is mostly done before flowering begins in crop plants. It is done using trowel, harrow or weedicides. Trowel is used in manual removal of weeds.
5) a Dr Robert koch
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