STD 11 - 16. Excretory product and their elimination — NEET STD 11 Science — Question

Which of the following is the function of Insulin?

Which of the following statements are incorrect ?
(i) Genes which code for a pair of contrasting traits are known as alleles, i.e., they are slightly different forms of the same gene.
(ii) T is used for the tall trait and t for the 'dwarf, and T and t are alleles of each other.
(iii) Allele may be homozygous, TT and tt, or heterozygous Tt.
(iv) To determine the genotype of a tall plant at F₂, Mendel crossed the tall plant from F₂, with a dwarf plant. This is called as test cross.
(v) In a typical test cross an organism showing a dominant phenotype is crossed with the any parent instead of self - crossing.
(vi) Based on his observations on monohybrid crosses Mendel proposed three general rules.

Secretion of which of the following is under neurosecretory nerve axons

Evolution is not continuous. It is a Jerky and a discontinuous process. This is the punch line of

Coelenterates are

Assertion: A special neural centre in the medula oblongata can moderate the cardiac function through autonomic nervous system (ANS).
Reason: Neural signals through the sympathetic nerves can decrease the rate of heart beat, speed of conduction of action potential and thereby the cardiac output.

The third phase in the development of a mammal is

Choose correct option for given statements :
(i) In a given population frequency of alleles of a gene or a locus is supposed to remain fixed through generations if population present in equilibrium.
(ii) Directional selection known to affect Hardy Weinberg equilibrium.
(iii) If migration occurs by chance, it is called genetic drift.
(iv) Sometimes the change in allele frequency is so different in the new sample of population that they become a different species.
(v) The original drifted population becomes founders of life in a new area and the effect is called founder effect.
(vi) Natural selection can lead to directional if more individuals acquire mean character value of the distribution curve.

Which part of the brain is called respiratory rhythm centre?