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Drip irrigation is not suitable for? |
| A) Fruit farms
B) Horticulture
C) Paddy fields
D) Floriculure
Correct Answer : Black colour absorbs heat quickly Explanation : Paddy, also called rice paddy, small, level, flooded field used to cultivate rice. |
Instrument used to measure the purity of milk is? |
| A) Hydrometer
B) Barometer
C) Lactometer
D) Anemometer
Explanation : A lactometer is an instrument that is used to check for the purity of milk by measuring its density. |
Excellent timber producing tree is? |
| A) Teak
B) Sal
C) Haldu
D) Babool
Correct Answer : Teak Explanation : teak is durable and fire-resistant. It can be easily seasoned and worked. It is among the most valuable timber trees of the world and its use is limited to superior work. |
If the pH of a soil sample is 4, which of the following substance can be added to help the growth of plants? |
| A) Calcium chloride
B) Calcium oxide
C) Urea
D) Organic matter
Correct Answer : Calcium oxide Explanation : A neutral solution has pH 7; a lower pH means that the solution is acid and a higher pH that it is alkaline. Calcium oxide, CaO is known as unslated lime, burnt lime and quicklime. It is manufactured by roasting calcitic limestone in a furnace. |
Which of the following reproduces from underground stem? |
| A) Radish B) Potato C) Carrot D) Sweet potato Correct Answer : Potato Explanation : Potato is a stem vegetable. The potatoes grow on underground stem. |
Which gas is fixed by Rhizobium bacteria present in the root nodules of a pea plant ? |
| A) Nitrogen B) Carbon dioxide C) Oxygen D) Helium Correct Answer : Nitrogen Explanation : Rhizobia forms a symbiotic relationship or nodules in the roots systems of legumes such as soybean, pea, clover alfalfa etc. These bacteria take nitrogen from the air and “fix” or concentrate it in pink root nodules, adding nitrogen to the soil in a form the plants can absorb thus eliminating the need of nitrogen fertilization. |