Genetics And Plant Breeding - Study Mode

[#926] An organism which has acquired a heritable variation as a result of sudden change in the hereditary material is called as a
Correct Answer

(C) Mutant

Explanation

Solution: An organism that has acquired a heritable variation as a result of the sudden change in the hereditary material is called a Mutant. A mutant is an organism or a new genetic character arising or resulting from an instance of mutation, which is generally an alteration of the DNA sequence of the genome or chromosome of an organism. The natural occurrence of genetic mutations is integral to the process of evolution.

[#927] Match the following columns: Column I Column II a. P 700 1. PS-I b. P 680 2. PS-II c. Grana 3. Photophosp horylation d. Stroma 4. Fixation of CO 2
Correct Answer

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

Explanation

Solution: a. P 700 or photosystem I primary donor, is the reaction-center chlorophyll a molecular dimer associated with photosystem I in plants, algae and cyanobacteria. b. P 680 or photosystem II primary donor is the reaction-center chlorophyll a molecular dimer associated with photosystem II in plants, algae, and cyanobacteria, and central to oxygenic photosynthesis. c. The phosphorylation of ADP to form ATP using the energy of sunlight is called photophosphorylation. It occurs in the grana of the chloroplast. d. Fixation of Carbon dioxide is the process of conversion of inorganic carbon to organic compounds (glucose) by living organisms. It is called as Calvin cycle, a part of the photosynthetic process, which occurs in the stroma of chloroplasts.

[#928] Translocation of carbohydrates mostly takes place in the form of
Correct Answer

(C) Sucrose

Explanation

Solution: Translocation of carbohydrates mostly takes place in the form of Sucrose. In plants, sucrose is the major transport form for photo-assimilated carbon and is both a source of carbon skeletons and energy for plant organs unable to perform photosynthesis. As a molecule translocated over distance, sucrose has to pass through several membranes. It is transported around the plant in phloem vessels.

[#929] The technique used for determining the molecular mass of a substance by dissolving it and measuring the freezing point of the solution is called
Correct Answer

(D) Cryoscopy

Explanation

Solution: The technique used for determining the molecular mass of a substance by dissolving it and measuring the freezing point of the solution is called Cryoscopy. Cryoscopy is the measurement of the freezing point of a liquid using a cryoscope. The estimation of the molecular weight of a compound by measuring its effect on the freezing point of a solvent. Helium is used in cryoscopy to obtain the very low temperatures required for superconductivity.

[#930] The jerking is followed in hybrid seed production in
Correct Answer

(D) Bazra

Explanation

Solution: The jerking is followed in hybrid seed production in Bazra. Removal of the first tiller or ear of the first tiller for synchronization of flowering of the parental line called Jerking. Bajra jerking is one of the steps followed for the synchronization of flowering in Bajra. It is done 20 - 25 days after transplanting or 30 - 40 days before direct sowing.