STD 12 - 2. human reproduction — NEET STD 11 Science — Question

Which of the following statements are incorrect for Natural selection ?
(i) Natural selection is based on certain observations which are factual.
(ii) Populations are stable in size except for seasonal fluctuation, means that there had been competition for resources.
(iii) Variation is the most fundamental evolutionary factor and all variations are inherited to the progeny.
(iv) Variations which are heritable and which make resource utilisation better for few (adapted to habitat better) will enable only those to reproduce and leave more progeny.
(v) Herbicides, pesticides etc., resistant organisms/cells are appearing in a time scale of months or years and not centuries.
(vi) Appearance of herbicides, pesticides etc., resistant organisms/cells are examples of evolution by anthropogenic action.

Intestinal excretory organs of Pheretima has a function of

They are gonado trophins

Most effective pesticides are

A chemical signal that has both endocrine and neural roles is

Statement I: Juxta glomerular apparatus (JGA) is a sensitive region formed by cellular modifications in the proximal convoluted tubule and afferent arteriole at the location of their content.
Statement II: A fall in GFR can activate the JG cells to release renin.

Given below are two statements :
Statement - I : Membrane-bound organelles of the endomembrane system coordinate cellular functions.
Statement - II : Mitochondria and chloroplasts are not considered a part of the endomembrane system.
In the light of the above statements, choose the mostappropriate answer from the options given below :

Location of hepatic caeca in cockroach.

Withdrawal symptoms of alcohol are