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1
Which of the following crop are grown in one year rotation ?
Rice-Wheat
Maize-Sugarcane.
Pea-Maize
All of these.
2
When the same crop is grown in the same field over and over again, the pests specific to the crop get the right conditions to multiply more and more________________.
Slowly
Rapidly
Both (a) and (b) are correct.
None of these.
3
Which of the following are Kharif crop ?
Rice
Maize
Cotton
4
Rabi crop are generally planted in ____________________.
November
January
March
July
5
What is the average temperature required for the production of rice ?
400
300
250
150
6
Which of the following is the micronutrient ?
Iron
Copper
Zinc
7
White rust disease are found in which of the following crop ?
Ground nut
Mustard
Wheat
8
What is the range of temperature required for the production of wheat ?
14oc to 18oc
34oc to 38oc
1oc to 8oc
9
Plants get carbon dioxide from __________________.
Water
Air
Light
10
Which of the following are correct :
(a) Genetic manipulation helps in obtaining desirable agronomic characters liked Dwarfness in cereals and tallness and profuse branching in fodder crops
(b) Genetic mutation helps in obtaining desirable agronomic characters liked Dwarfness in cereals and tallness and profuse branching in fodder crops
Only (a) is correct.
Only (b) is correct.
11
(a) Use of improved seeds/ crops developed by plant breeding can improve crop yield.
(b) Protection of plants from pests by using pesticides can improve crop yield.
12
(a) Silo storage is considered the best option for wheat storage.
(b) The average duration of storage of wheat is more than 1 year in the warehouses.
13
(a) Crops grown in the winter season and harvested in the spring season are called Zaid crops.
(b) Cucumber, Watermelon, Muskmelon, Pulses, etc. are the examples of summer crops.
14
(a) Green plants are called autotrophs because they synthesize their own food.
(b) Green plants are called heterotrophs because they synthesize their own food.
(c) The organisms which cannot synthesize their own food are called autotrophs.
Only (c) is correct.
15
(a) The excessive use of chemical fertilizers can change the nature of the soil making it too acidic.
(b) The excessive use of chemical fertilizers can change the nature of the soil making it too alkaline.
(c) The fertilizers finally reach the aquatic systems during the rainy season, making the water unfit for human consumption.
Only (a) and (b) are correct.
Only (b) and (c) are correct.
Only (a) and (c) are correct.