Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The cavity of diencephalon is known as

  • I ventricle

  • II ventricle

  • III ventricle

  • iter


C.

III ventricle

Diencephalon is located between cerebral hemispheres above and midbrain below. Its cavity is known as the third ventricle or diocoel. It is connected to each lateral ventricle of cerebral hemisphere byforamen of Monro, seperately.


2.

Compond squamous epithelium is found in

  • stomach

  • intestine

  • trachea

  • pharynx


D.

pharynx

In the structure of compound squamous epithelium, several layers of cells, deep layers are cuboidal to columnar, surface layers flat and scale- like.

It is found in mouth, oesophagus, part of epiglottis (pharynx) and vagina. The main function of this epithelium is protection.


3.

Protein present in silk fibre is

  • caesin

  • keratin

  • elastin

  • fibroin


D.

fibroin

Silk fibre is formed of two proteins namelyfibroinandsericin.


4.

The reabsorption of water in the kidney is under the control of

  • LH

  • ADH

  • STH

  • ACTH


B.

ADH

Antidiuretic hormone (ADH) controls the tubular permeability and concentration of sodium in the extracellular fluid. It regulates the osmotic pressure of body fluids by causing the kidneys to increase water reabsorption.

It associates with the renal pressure system and then regulates the fluid volume of body through the agency of hypothalamic osmoreceptors.


5.

In sea anemone, the symmetry is

  • radial

  • bilateral

  • spherical

  • absent


A.

radial

In radial symmetry, body is divided into two similar halves by more than two planes passing through the main axis.

Cnidarians or coelenterates such asHydra, sea anemone,Aurelia,Obeliaetc are radially symmetrical animals with cell- tissue grade of body organizations.


6.

Which vitamin should not be stored?

  • Calciferol

  • Retinol

  • Niacin

  • Ascorbic acid


D.

Ascorbic acid

Vitamin- C (ascorbic acid) has virucidal property. It is water soluble vitamin,ie, it dissolves in water and its excess amount is excreted in urine.


7.

From outer to inside the sequence of three bones present in the middle ear of mammals is

  • malleus, stapes and incus

  • stapes, malleus and incus

  • malleus, incus and stapes

  • incus, malleus and stapes


C.

malleus, incus and stapes

The middle ear cavity in mammals characteristically contains a chain of three little bones or ear ossicles extending between the tympanic membrane and the fenestra ovalis. These are called malleus (hammer), incus (anvil) and stapes (stirrup) because of their characteristic shapes.


8.

Moulting hormone is secreted by

  • corpora cardacum

  • corpora allata

  • neurosecretory hormone

  • prothoracic gland


D.

prothoracic gland

Prothoracic gland is also known as moult gland in some arthropods and Y organ or ventral gland in crustaceans. It secretes moulting hormone called ecdysone or ecdysome, which is steroid and stimulates moulting or ecdysis during metamorphosis in insects.


9.

Solenocytes are associated with

  • respiration

  • digestion

  • excretion

  • nutrition


C.

excretion

Solenocytesor flame cells are the excretory organs of Phylum- Platyhelminthes.


10.

Movements by pseudopodia of Amoeba are due to change in

  • pressure

  • atmosphere

  • temperature

  • viscosity


B.

atmosphere

Sol- gel theory of amoeboid movement was first given by Hyman, later supported by Pantin (1923) and Mast (1926). According to this theory, amoeboid locomotion is due to change in the viscosity of cytoplasm.