STD 11 - 15. Body fluids and criculations — NEET STD 11 Science — Question

Physical barrier = .............. and physiological barrier = .............

Assertion: Characters segregate while formation of gametes.
Reason: The recessive characters are only expressed in homozygous conditions.

Active transport involves

Which of the following is incorrect w.r.t. junction and its function?

A normal woman whose father was colourblind. marries a normal man. What kinds of children can be expected and in what proportion?

Mammals have the ability to produce a concentrated urine. Which statement not match with production of concentrated urine ?
(i) The Henle's loop and vasa recta play a significant role in this.
(ii) Concentration of urine occurs by counter current mechanism.
(iii) The proximity between the Henle's loop and vasa recta, as well as the counter current in them increases osmolarity from cortex to medulla.
(iv) Osmolarity increasing from 300 mOsmol L' in the cortex to about 1200 mOsmol L' in the inner medulla.
(v) Osmolarity gradient from cortex to medulla is mainly caused by NaCl and urea.
(vi) Presence of osmolarity gradient helps in an easy passage of water from the collecting tubule thereby concentrating the filtrate (urine).
(vii) Human kidneys can produce urine nearly four times concentrated than the initial filtrate formed.

What is not true for smooth muscle fibres?

Frequency of crossing over in a chromosome is an index of

Use of spermicidal creams, jellies and foams along with diaphragms, cervical caps and vaults leads to