$I.$ Communication was not easy
$II.$ Concept of factors which did not blend was not accepted
$III.$ Use of mathematics to explain biological problem was unacceptable
$IV.$ He could not provide any physical proof for the existence of factors Choose the right combination
$(i)$ Communication was not easy
$(ii)$ Concept of factors which did not blend was not accepted
$(iii)$ Using of mathematics to explain biological problem was unacceptable
$(iv)$ He could not provide any physical proof for the existence of factors
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$I.$ Natural selection is essential for evolution
$II.$ Natural selection do not include variations
$III.$ Concept of natural selection was given by Hugo de Vries
$IV.$ Mutation is the sudden inheritable change
$V.$ Synthetic theory is also called Neo-Darwinism theory of evolution The correct combination is a
| (a) Descending limb of Henle's loop | (i) Reabsorption of salts only |
| (b) Proximal convoluted tubule | (ii) Reabsorption of water only |
| (c) Ascending limb of Henle's loop | (iii) Conditional reabsorption of sodium ions and water |
| (d) Distal convoluted tubule | (iv) Reabsorption of ions, water and organic nutrients |
$I.$ The medulla is connected to the spinal cord
$II.$ Medulla contains controlling centres for respiration, cardiovascular reflexes and gastric secretion
$III.$ Cerebellum has very convoluted surface in order to provide the additional space for more neurons
| Column – I | Column $- II$ |
| $(1)$ Failure of cytokinesis | $(p)$ To study in beritance of particular traits |
| $(2)$ Trisomy of 21 | $(q)$ Polyploidy |
| $(3)$ Error of metabolism | $(r)$ Down's syndrome |
| $(4)$ Pedigree analysis | $(s)$ Phenylketonuria |