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a) In what ways do farmers try to improve the quality of (i) their soil, (ii) their crop plants?
b) What other steps do farmers take to maximise the yield from their crops?
A) (i) Soil quality is better by adding organic manure or compost and artificial fertilisers, by adding lime (to reduce acidity), by ploughing (to improve aeration and drainage), by draining (to reduce water logging).
(ii) Farmers try to select crop plants which have a high yield and which are resistant to diseases.
(B) Farmers irrigate their crops and try to eliminate weeds and pests.
Describe a. the factors responsible for promoting lactation, and b. the mechanism responsible for the cessation of lactation when a mother weans her baby.
Q. Why is the digestive system of these animals called incomplete? Incomplete digestive system is in that which the digestive cavity has only one opening.
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ARTIFICIA L SELECTION - Man selects the individuals having the desired traits and separates them from those, which do not possess such characters. The selected ones are
Why do few plants adapted to a dry environment open their stomata only at night? Throughout the day in dry habitats the guard cells become the stomata close and flaccid; concur
What is the meaning of Body composition? It refers primarily to the distribution of muscle, fat, bone and other tissues in the body, and its measurement is often considered as
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Q. Advantage and Disadvantage of steam sterilization? Advantage: most efficient and reliable sterilization method available. Its quite simple to operate and relatively inexpens
Why is complementary base pairing important in DNA structure? Complementary base pairing is important because the hydrogen bonds between the bases hold the two strands of DNA
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