Agronomy - Study Mode
[#421] Brassica juncea has been evolved after hybridization between
Correct Answer
(A) B. nigra and B. campestris
Explanation
Solution: Brassica Juncea is a variety of mustard seeds, commonly known as Brown mustard, Chinese mustard, Indian Mustard, etc. It is an amphidiploid with a chromosome number of 18. It evolved after hybridization between B. nigra (n = 8) and B. compestris (n = 10). The type of hybridization is natural interspecific hybridization.
[#422] Who introduced the technique of production of double cross hybrid maize
Correct Answer
(B) D. F. Jones
Explanation
Solution: Donald Forsa Jones was a maize scientist and practical corn breeder at the Connecticut Agricultural Experiment Station, New Haven introduced the technique of production of double cross hybrid maize. Double cross hybrid is the type of hybrid that is produced when two different single-cross hybrids are cross-pollinated.
[#423] Maximum edible oil in India is contributed by
Correct Answer
(D) Groundnut
Explanation
Solution: Out of the given options. Maximum edible oil in India is contributed by Groundnut. The total consumption of groundnut oil across India from the financial year 2021, is 1,170 thousand metric tons. Gujarat is the largest groundnut oil-producing state accounting for 40% of total groundnut produced in the country.
[#424] In green houses which of the following gas not found abundantly?
Correct Answer
(D) O 2
Explanation
Solution: Although plants respire and produce oxygen (O 2 ) then also the percentage of available oxygen gas is not found abundantly in the greenhouse. Levels of 8mg/l of oxygen are considered to be good for greenhouse production. Whereas CO 2 , NH 4 and N 2 O are available in abundance in the greenhouse.
[#425] The rice inflorescence is known as
Correct Answer
(A) Panicle
Explanation
Solution: The inflorescence is the arrangement of the flowers on the plant and refers to the flower head of a plant including stems, stalks, bracts and flowers. The inflorescence of rice is a Panicle spikelet . the type of inflorescence is racemose type in Rice in which the flowers are borne on short stalks of about equal length at equal distances along an elongated axis and open in succession toward the apex.