STD 12 - 7. human health and disease — NEET STD 11 Science — Question

Which of the following organs synthesises urea?

Which of the following organ is differentiated first during development ?

Mechanism of hearing :
(i) The external ear receives sound waves and directs them to the ear drum.
(ii) Nerve impulses are generated in the associated afferent neurons.
(iii) The waves in the lymphs induce a ripple in the basilar membrane.
(iv) The vibrations are passed to the fluid of the cochlea, where generate waves in the lymphs.
(v) Vibrations are transmitted through the ear ossicles to the oval window.
(vi) The ear drum vibrates in response to the sound waves
(vii) Impulses are transmitted via auditory nerves to the brain, where the impulses are analysed and the sound is recognised
Choose correct sequence of mechanism of hearing :-

In humans, the excretory system consists of a pair of kidneys, one pair of ureters, a urinary bladder and a urethra. Select correct option for kidneys:
(i) Kidneys are oval- shaped structures which are situated between the levels of last thoracic and third lumbar vertebra.
(ii) Through hilum ureter, blood vessels and nerves enter in kidney.
(iii) Inner to the hilum is a broad funnel – shaped space called the renal pelvis with projections called calyces.
(iv) The outer layer of kidney is a tough capsule.
(v) The medulla is divided into a few pyramids projecting into the calyx.
(vi) The medulla extends in cortex called columns of Bertini.

Toddy drinks is made by fermentation from

The potential difference in the membrane which is responsible for the conduction of an impulse is brought about by a change in the membrane

The function of Henle's loop is

Assertion: The Malpighian corpuscle, PCT and DCT of the nephron are situated in the cortical region of the kidney.
Reason: In cortical nephrons, the loop of Henle is very long and runs deep into the medulla.

During serological test in which anti-human serum is mixed with blood of another animal, blood of which animal gives the thickest precipitate