Genetics And Plant Breeding - Study Mode

[#86] Seed act was formulated in
Correct Answer

(A) 1966

Explanation

Solution: The seed act was formulated in 1966. Seed Act is Act no 54 of the year 1966 and was promulgated on 29 th December 1966. The objective was to regulate the quality of seeds supplied and sold to the farmers. The important provisions of the Act are to establish Central Seed Committee to advise Central Government on all matters of Seeds and to establish Central Seed testing laboratories. The object of the Seed Act is to regulate the quality of certain notified kinds/varieties of seeds for sale and matters connected therewith.

[#87] Indigenous cotton is
Correct Answer

(C) Gossypium hirsutum

Explanation

Solution: Indigenous cotton is Gossypium hirsutum. Gossypium hirsutum, also known as upland cotton or Mexican cotton, is the most widely planted species of cotton in the world. Globally, about 90% of all cotton production is of cultivars derived from this species. Gossypium hirsutum includes several varieties or cross-bred cultivars with varying fiber lengths and tolerances to several growing conditions.

[#88] Relative Biological Effictiveness (RBE) usually refers to the damage caused by
Correct Answer

(C) Radiation

Explanation

Solution: Relative Biological Effectiveness (RBE) usually refers to the damage caused by Radiation. Relative biological effectiveness (RBE) is defined as the ratio of a dose of standard radiation to the dose of test radiation to produce the same biological effects. RBE is a relative measure of the damage done by a given type of radiation per unit of energy deposited in biological tissues.

[#89] Match the following columns: Column I Column II a. Enhancement effect 1. Warburg b. C 3 cycle 2. Hatch and slack c. C 4 cycle 3. Emerson d. Two step photosynthesis 4. Calvin
Correct Answer

(B) a-3, b-4, c-2, d-1

Explanation

Solution: a. Enhancement effect is given by Emerson- The Emerson effect is the increase in the rate of photosynthesis after chloroplasts are exposed to the light of wavelength 680 nm (deep red spectrum) and more than 680 nm (far red spectrum). b. C 3 cycle is given by Calvin- The Calvin cycle, light-independent reactions, of photosynthesis is a series of chemical reactions that convert carbon dioxide and hydrogen-carrier compounds into glucose. c. C 4 cycle is given by hatch and slack- C 4 carbon fixation or the Hatch–Slack pathway is one of three known photosynthetic processes of carbon fixation in plants. It owes the name to the 1960's discovery by Marshall Davidson Hatch and Charles Roger Slack that some plants when supplied with 14 CO 2 , incorporate the 14 C label into four-carbon molecules first. d. Two-step photosynthesis is given by Warburg- The Warburg effect is the decrease in the rate of photosynthesis due to high oxygen concentrations. Oxygen is a competitive inhibitor of carbon dioxide fixation by RuBisCO which initiates photosynthesis. Furthermore, oxygen stimulates photorespiration which reduces photosynthetic output. These two mechanisms working together are responsible for the Warburg effect.

[#90] Biological fixation of nitrogen is helped by
Correct Answer

(D) Molybdenum

Explanation

Solution: The biological fixation of nitrogen is helped by Molybdenum. Molybdenum (Mo), an essential micronutrient, plays an important role in nitrogen (N) metabolism and protein synthesis in plants. During symbiotic N fixation, Mo acts as a cofactor for nitrogenase enzymes to catalyze the redox reaction to convert elemental N into ammonium (NH 4 + ) ions.