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

............ can generate the maximum number of action potential and is responsible for initiating and maintaining the rhythmic contractile activity of heart. Therefore it is called the pacemaker.

Each kidney has nearly one million complex tubular structures called nephrons which are the functional units. Form given character which are not applicable to nephron ?
(i) Each nephron has two parts – the glomerulus and the renal tubule.
(ii) Glomerulus is a tuft of capillaries formed by the afferent arteriole.
(iii) Blood from the glomerulus is carried away by an efferent arteriole.
(iv) The renal tubule begins with a double walled cup-like structure called Bowman’s capsule, which encloses the glomerulus.
(v) Glomerulus along with Bowman’s capsule, is called the malpighian body or renal corpuscle.
(vi) The Malpighian corpuscle, PCT and DCT of the cortical nephron are situated in the cortical region of the kidney.
(vii) In only some nephrons, the loop of Henle is too short and extends only very little into the medulla called cortical nephron.

Which one of the following is matching pair?

A normal­visioned man whose father was colour­ blind, marries a woman whose father was also colour­blind. They have their first child as a daughter. What are the chances that this child would be colour­ blind ?

In which segment of the nephron, reabsorption is minimum?

Which of the following glands are present in the brain?

Select the option which shows correct matching of animal with its excretory organ and excretory product.

The autonomic neural system is a division of

Which of the following structures is homologus to the wing of a bird ?

Assertion: Nephridia are the tubular excretory structures of earthworms and other annelids.
Reason: Nephridia help to remove nitrogenous wastes and maintain a fluid and ionic balance.