Horticulture - Study Mode
[#796] The cultivated carrot (Daucus carota L.) has a chromosome number of
Correct Answer
(B) 2n = 18
Explanation
Solution: The cultivated carrot (daucus caroto L.) has a chromosome number of 2n = 18. The carrot is a diploid species and has nine relatively short, uniform-length chromosomes ( 2n = 18). The genome size is estimated to be 473 mega base pairs. The cytogenetic characterization of the carrot genome (Daucus carota L., 2n = 18) has been limited so far, partly because of its somatic chromosome morphology and scant of chromosome markers.
[#797] In preservation of food . . . . . . . . PPM of colour is permitted.
Correct Answer
(A) 200
Explanation
Solution: Food preservation can be defined as the process of treating and handling food in such a way as to stop or greatly slow down spoilage and prevent foodborne illness while maintaining nutritional value, texture and flavour. In food preservation colour is added to make food more attractive, appealing, appetizing, and informative. In preservation of food 200 ppm of colour is permitted.
[#798] Enzymes are inactivated in produce by
Correct Answer
(C) Blanching
Explanation
Solution: Blanching is a cooking process in which a food, usually a vegetable or fruit, is scalded in boiling water, removed after a brief, timed interval and finally plunged into iced water or placed under cold running water (known as shocking or refreshing) to halt the cooking process. Blanching foods helps reduce quality loss over time. Enzymes are inactivated in produce by Blanching . Heat treatment and blanching is the simplest and direct method of enzyme inactivation.
[#799] Isolation distance for production of certified seeds of Okra is
Correct Answer
(B) 200 m
Explanation
Solution: Isolation distance for production of certified seeds of okra is 200 m. Isolation distance is the minimum separation required between two or more varieties of the same species for the purpose of keeping seed pure. Isolation prevents unwanted cross-pollination and is the primary practice required to keep varieties true to type. Isolation begins with an understanding of the distance required to limit or eliminate chances of cross-pollination between two varieties of the same species.
[#800] Purple Top Roll disease of potato is transmitted by . . . . . . . .
Correct Answer
(C) Leaf hopper
Explanation
Solution: Purple top roll disease of potato is transmitted by leaf hopper . The disease was also observed in 2003 and 2004, especially in organic potato fields. A graft transmissible disease of potato termed purple top roll is prevalent in several potato varieties grown in the hilly tracts of India. The common symptoms are rolling of the basal parts of younger leaves, sometimes accompanied by pink or purple pigmentation.