STD 11 - 17. Locomotion and movement — NEET STD 11 Science — Question

Which of the following hormones is responsible for both the milk ejection reflex and the foetal ejection reflex ?

The lowest capacity of cranium was found in the

The medullary sheath of the nerve fibre is interrupted at intervals by

Which one of the following animals is a coelenterate

Which of the following pairs is wrong?

Myelin sheath covers

Somatostatin is secreted by

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.

Assertion: Blood is a special connective tissue consisting of a fluid matrix plasma and formed elements.
Reason: Plasma is a straw coloured, viscous fluid constituting nearly 45 per cent of the blood.