Genetics And Plant Breeding - Study Mode

[#786] What is the effect of low atmospheric pressure on transpiration?
Correct Answer

(B) It increase slowly

Explanation

Solution: The effect of low atmospheric pressure on transpiration is it increases slowly. The rate of transpiration is inversely proportional to the atmospheric pressure. if the atmospheric pressure is low, it causes an increase in the rate of transpiration. This happens because, at low pressure, the water vapour moves faster causing an increase in the rate of increase of transpiration.

[#787] Binomial nomenclature consists of
Correct Answer

(B) Genus and species

Explanation

Solution: Binomial nomenclature consists of Genus and species. Binomial nomenclature is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin grammatical forms. Both codes consider the first part of the two-part name for a species to be the "generic name" of a genus. In the zoological code ( ICZN ), the second part of the name is a "specific name" i.e. species.

[#788] Formula of double monosomic is
Correct Answer

(C) 2n - 1 - 1

Explanation

Solution: Formula of double monosomic is 2n - 1 - 1. A double monosomic is missing one chromosome from each of two pairs of homologous chromosomes (designated 2N-1-1). Double monosomy is the loss of one chromosome from each of two pairs of homologous chromosomes. The term "monosomy" is used to describe the absence of one member of a pair of chromosomes.

[#789] The world 'Mutation' was first used by
Correct Answer

(B) Hugo de Vries

Explanation

Solution: The word 'Mutation' was first used by Hugo de Vries. Hugo Marie de Vries (16 th February 1848 - 21 st May 1935) was a Dutch botanist and one of the first geneticists. He is known chiefly for suggesting the concept of genes, rediscovering the laws of heredity in the 1890s while unaware of Gregor Mendel's work, introducing the term "mutation", and developing a mutation theory of evolution.

[#790] The fusion of a male gamete with two polar nuclei is often termed as
Correct Answer

(C) Triple fusion

Explanation

Solution: The fusion of a male gamete with two polar nuclei is often termed Triple fusion. Double fertilization is a complex fertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte (megagametophyte, also called the embryo sac) with two male gametes. The haploid sperm and haploid egg combine to form a diploid zygote, the process being called syngamy, while the other sperm and the two haploid polar nuclei of the large central cell of the megagametophyte form a triploid nucleus (triple fusion).