Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Proximal and distal convoluted tubules are parts of a

  • nephron

  • oviduct

  • vas deferens

  • caecum


A.

nephron

A nephron is made of two parts Malpighian corpuscle and tubule. Tubule consists of Proximal Convoluted Tubule (PCT), loop of Henle and distal convoluted tubule. 

The proximal tubule is the segment of the nephron in kidneys which begins from the renal pole of the Bowman's capsule to the beginning of loop of Henle. The distal convoluted tubule (DCT) is a portion of kidney nephron between the loop of Henle and the collecting tubule.


2.

Cranial nerve showing maximum branching is

  • trigeminal

  • vagus

  • optic

  • facial


B.

vagus

Vagus or pneumogastric is a mixed nerve, which originates from side of medulla oblongata. It has 5 branches

(i) superior laryngeal

(ii) recurrent laryngeal

(iii) cardiac

(iv) pneumogastric

(v) depressor.


3.

Gonadotrophins are secreted from

  • gonads

  • anterior pituitary

  • posterior pituitary

  • antidiuretic hormone


B.

anterior pituitary

Gonadotropic hormones, eg, gonadotrophins are of two types : Follicular stimulating hormone and luteinizing hormone. These hormones are secreted from anterior pituitary gland. Gonads secrete sex hormones and posterior pituitary gland secretes oxytocin and antidiuretic hormone.


4.

Heart beats originates from

  • pace maker

  • cardiac muscles

  • left atrium

  • right ventricle


A.

pace maker

Cardiac impulse (heart beat) normally originate from the pace-maker (SA node).


5.

Which of the following is a part of pectoral girdle?

  • Ilium

  • Ischium

  • Acetabulum

  • Glenoid cavity


D.

Glenoid cavity

Pectoral girdle or shoulder girdle is composed of two separate halves. Each half consists of the scapula or shoulder bone, coracoid process and clavicle or collar bone. At the junction of scapula and clavicle, is a concave depression, called glenoid cavity, which articulates with the head of the humerus to form a ball and socket joint.


6.

The instrument used for measuring blood pressure is

  • electrocardiograph

  • X-rays

  • sphygmomanometer

  • electroencephalograph


C.

sphygmomanometer

Sphygmomanometer, commonly called blood pressure apparatus, is an instrument for measuring blood pressure.

Electrocardiograph is a machine used for electrocardiography.

X- rays are a type of radiation called electromagnetic waves.

Electroencephalograph is a machine used for electroencephalography.


7.

Heart sound dub is caused due to closing of

  • valve

  • tricuspid valve

  • semilunar valve

  • None of the above


C.

semilunar valve

Dup (a second heart sound) occurred by closing the semilunar valve when high pressure developed in aorta and pulmonary artery tends to force some blood back towards the ventricle.


8.

Posterior pituitary gland

  • produces and store hormones

  • stores 6 trophic honnones

  • stores and releases ADH and oxytocin

  • release and store growth and thyroid stimulating hormone


C.

stores and releases ADH and oxytocin

Posterior pituitary gland is the back portion of the pituitary. It is a small gland in the head called the master gland. It does not synthesize any hormone but stores and releases two hormones ADH (Antidiuretic Hormone) and Oxytocin.

Antidiuretic hormone is released in response to a fall in the water content of blood plasma and leads to an increase in the permeability to water of the distal and collective tubules of the nephron in the kidney so that water is retained in the blood plasma.

Oxytocin causes contraction of the uterus during birth and the ejection of milk from the nipple.


9.

Water vascular system is characteristic of

  • Protozoa

  • Porifera

  • Annelida

  • Echinodermata


D.

Echinodermata

Ambulacral system or water vascular system is a characteristic feature of echinoderms. This system comprises the system of canals and tube feet. Tube feet are also a characteristic feature of echinoderms, which help in adhesion, respiration, food capturing and locomotion.


10.

Earthworms are economically important for man as these are used as

  • bait for catching fish

  • food of poultry

  • medicine for gout

  • All of the above


D.

All of the above

Earthworms are of great economic importance for man. These are the natural plougman which make the soil porous and fertile. These are also used in medicines for piles, gout, diarrhoea, jaundice, stones of bladder and sexual impotency earthworms are also used as bait for fishes.