Genetics And Plant Breeding - Study Mode

[#586] Triticale is
Correct Answer

(C) Intergeneric cross

Explanation

Solution: Triticale is Intergeneric cross. An intergeneric hybrid is a cross between plants in two different genera in the same family. They are closely related enough that pollination will produce a hybrid, though the seeds of this hybrid are usually sterile. Triticale is a hybrid of wheat ( Triticum ) and rye ( Secale ) first bred in laboratories during the late 19 th century. Triticale is almost always a second-generation hybrid, i.e., a cross between two kinds of primary (first-cross) triticales. The triticale hybrids are all amphidiploid, which means the plant is diploid for two genomes derived from different species.

[#587] Match the following columns: Column I Column II a. Solute potential 1. Osmotic potential b. Pressure potential 2. Plasmolysis c. Hydrophilic colloids 3. Turgor pressure d. Exosmosis 4. Imbibition
Correct Answer

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

Explanation

Solution: a. Solute potential is also called osmotic potential. It is the pressure that needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane. b. Pressure potential is also called turgor pressure. Turgor pressure is the hydrostatic pressure over ambient atmospheric pressure which can build up in living, walled cells. c. Hydrophilic colloids lead to Imbibition. Hydrophilic colloids contain an outer shell of groups that interact favorably with water, thus causing cells to retain water and imbibe. d. Exosmosis leads to plasmolysis. Exosmosis is the process by which water molecules flow out of the cell and over the cell membrane, and leads to shrinkage or plasmolysis of a cell.

[#588] In a mass selection, plants are selected on the basis of
Correct Answer

(A) Phenotypes

Explanation

Solution: In a mass selection, plants are selected based on Phenotypes. In mass selection, seeds are collected from desirable appearing individuals in a population, and the next generation is sown from the stock of mixed seeds. This procedure sometimes referred to as phenotypic selection, is based on how each individual looks.

[#589] The registered seeds produced from
Correct Answer

(B) Foudation seed

Explanation

Solution: The registered seeds are produced from Foundation seeds. Registered seed shall be the progeny of foundation seed that is so handled as to maintain its genetic identity and purity according to standard specified for the particular crop being certified. A purple colour certificate is issued for this category of seed.

[#590] The low neurotoxin variety of Lathyrus is
Correct Answer

(D) Pusa 24

Explanation

Solution: The low neurotoxin variety of Lathyrus is Pusa 24. Lathyrus is considered a drought-tolerant hardy crop, and is grown in low-rainfall regions under rainfed conditions, during winter when lentils and chickpeas are not expected to give good yields. Its development into an important food legume, however, has been hindered by the presence of the neurotoxin - beta-N-oxalyl-L-alpha,beta-diaminopropionic acid (beta-ODAP) in seeds which, if consumed in large quantities for prolonged periods, can cause irreversible paralysis.