Agronomy - Study Mode

[#586] Gene responsible for dwarfing characters in rice is
Correct Answer

(B) Dee-gee-woo-gen

Explanation

Solution: Dee-gee-woo-gen is the Gene responsible for the dwarfing characters in rice. This miracle rice is the high yielding semi-dwarf rice variety developed by the International Rice Research Institute in early 1960. This gene encodes an enzyme in the production of the hormone gibberellin which affects the plant height, and this improves its yield also.

[#587] Bio gas contains CH 4
Correct Answer

(D) 45 - 50%

Explanation

Solution: Biogas is a mixture of gases, primarily composed of methane, Carbon dioxide, and hydrogen sulphide. A renewable source of energy produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste and food waste. It contains 45 - 50% of methane and carbon dioxide (25 - 50%).

[#588] Unit of LAI (Leaf Area Index) is
Correct Answer

(D) unit less

Explanation

Solution: LAI (Leaf Area Index), is a dimensionless quantity that characterizes the size of the plant canopies. It is defined as the projected area of leaves over a unit of land. It expresses the leaf area per unit ground or trunk surface area of a plant and is used as an indicator of the growth rate of a plant.

[#589] Principal 'N' fixing algal community of blue-green algae?
Correct Answer

(B) Anabaena

Explanation

Solution: Anabena is the principal nitrogen-fixing algal community of blue-green algae. It is found as plankton in shallow water and on moist soil as beadlike or barrel cells and interspersed with enlarged spores. They form symbiotic relationships with certain plants, such as mosquito fern.

[#590] Water potential at Aquifer
Correct Answer

(A) Near 0 bar

Explanation

Solution: An aquifer is a body of rock or sediment that holds groundwater. Water potential at aquifers here means the total amount of permanent storage that exists in the aquifers in the form of ground water. Water potential at the aquifer is nearly 0 bar.