STD 11 - 4. Animal kingdom — NEET STD 11 Science — Question

Nitrogenous waste is excreted in the form of pellet or paste by :

The closest relative of modern day man is considered to be

Phenyketonuria is a genetic disorder of

Choose incorrect sentence

Select the correct statement for sunflower
a. It is the member of asteraceae family
b. The placenta develops at the base of ovary and a single ovule is attached to it
c. A single leaf arise at each node in alternate manner
d. Ovary inferior

Which of the following is true of Aves?

Phenotype of an organism is the result of

IUDS within .......... of coitus have been found to be very effective as emergency contraceptives as they could be used to avoid possible pregnancy due to rape or casual unprotected intercourse.

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.