IMPROVEMENT IN FOOD RESOURCES.
1.Define hybridization and its types.
2. Enumerate two differences between mixed cropping and intercropping.
3.Give two advantages of using manure over fertilizer.
4.State any four factors for which crop variety improvement is done.
5.Define the term photoperiod. State its significance.
6. Plants get carbon, oxygen and hydrogen from_____________________ and ____________________.
7.Fill in the blanks :
(a) Kharif crops are cultivated from _________________________to __________________________.
(b) Rabi crops are cultivated from _____________________to______________________________.
(c) Paddy, maize, green gram, soyabean, cotton, pigeon pea, ground nut and black gram are ________________crops.
(d) Wheat, gram, pea, mustard, linseed, barley, potato, tomato, cumin, oat and fenugreek are _______________ crops.
e. Soil ........................... plays an important role in plant growth.
f. ........................... available in soil leads to germination of seeds.
g. Water acts as a ........................... for absorption of water.
h. ........................... is the association of fungi with root.
i. ........................... produces ........................... in leguminous plants.
j. Indian soils are usually ........................... in inorganic matter as well as in ...........................
k. Repeated use of sodium nitrate fertilizer increase the ........................... of the soil.
l. The chemical used to destroyed weeds are known as ...........................
m. Rust is a disease of wheat crop caused by ...........................
n. 2,4-D, and MCPA both are example of ...........................
8. Which farming doesn't use chemicals such as fertilisers, herbicides and pesticides?
A) Inorganic farmingB) Organic farmingC) IntercroppingD) None of these
9. How many nutrients are essential to plants?
A) 12B) 16C) 18D) 20
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