Genetics And Plant Breeding - Study Mode
[#171] Passive absorption of minerals takes place through
Correct Answer
(C) Ionic exchange
Explanation
Solution: Passive absorption of minerals takes place through the Ionic exchange. Ion exchange is a reversible process, and the ion exchanger can be regenerated or loaded with desirable ions by washing with an excess of these ions. In plants and animals, mineral absorption, also called mineral uptake is how minerals enter the cellular material, typically following the same pathway as water.
[#172] An individual with gametic chromosome number is
Correct Answer
(B) Haploid
Explanation
Solution: An individual with a gametic chromosome number is a Haploid. Haploid refers to the presence of a single set of chromosomes in an organism's cells. A haploid describes a cell that contains a single set of chromosomes. The term haploid can also refer to the number of chromosomes in egg or sperm cells, which are also called gametes. In humans, gametes are haploid cells that contain 23 chromosomes, each of which a one of a chromosome pair that exists in diploid cells.
[#173] Chiasmata termininaliztion occurs in
Correct Answer
(B) Diplotene
Explanation
Solution: Chiasmata terminalization refers to the movement of chiasmata (the points where crossing over has occurred between homologous chromosomes) towards the ends of the chromosomes. This process is a key feature of the Diplotene stage of Prophase I in meiosis. During Diplotene, the homologous chromosomes begin to separate but remain attached at chiasmata, which gradually move toward the telomeres — a process known as terminalization. Pachytene is the stage where crossing over occurs, Zygotene is when synapsis starts, and Leptotene is the initial stage where chromosomes begin to condense. Therefore, chiasmata terminalization specifically occurs during Diplotene.
[#174] In which conditions, the seeds can be preserved safely
Correct Answer
(B) Cool and dry
Explanation
Solution: The seeds can be preserved safely in cool and dry conditions. Keep them in a dry and cool place to extend their viability. Seeds easily re-absorb moisture. To maintain dryness, seeds are kept in air-tight containers like tin cans or glass jars with tight-fitting lids. Put in some moisture-absorbing material.
[#175] Consider the following genotypes 1. Breeding lines 2. Land races 3. Variety under cultivation What is the correct sequence of these in terms of their importance to farmers
Correct Answer
(B) 2, 3 and 1
Explanation
Solution: The correct sequence of these genotypes in terms of their importance to farmers are: First of all, is Landraces, then Variety under cultivation, and lastly breeding lines. The term “landrace” has generally been defined as a cultivated, genetically heterogeneous variety that has evolved in a certain ecogeographical area and is therefore adapted to the edaphic and climatic conditions and to its traditional management and uses. In agriculture, a variety corresponds to a population of plants of a given species that have been selected and cultivated. Breeding lines are a group of identical pure-breeding diploid or polyploid organisms, distinguished from other individuals of the same species by some unique phenotype and genotype.