NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


In cockroach, larval and nymphal characters are maintained by

  • ecdysone

  • salivary glands

  • parotid gland

  • juvenile hormone


juvenile hormone

Juvenile hormone is produced by corpora allata in insects, it favors the development of juvenile characteristics. During larval life, this hormone predominates and each moult yields another larger juvenile and keeps the larva in immature condition or maintains juvenility.

Ecdysone is a steroidal, moulting hormone of prothoracic gland, in insects that triggers metamorphosis.

Salivary glands are the merocrine or epicrine type of gland. Their secretion diffuses out through the cell surface, causing no damage to the cell. In man, 3 pairs of salivary glands are present and in rabbit, they are 4 pairs. salivary glands are absent in frog.

Parotid glands are compound tubulo- acinar glands and are the type of salivary glands with a flask like secretory portion. Poison gland of a toad is modified parotid gland. In rabbit, parotid glands are the largest salivary glands present beneath the ears. Duct of parotid gland is known as Stenson's duct in man.


Thigmotaxis is not shown by

  • Paramecium

  • Amoeba

  • Ascaris

  • Hydra



Ascaris do not show thigmotaxis.

Amoeba shows thigmotaxis. On coming in contact with a solid object Amoeba generally avoid it by moving in a different by forming pseudopodia.

Hydra is known to respond to a variety of stimuli, both external and internal. On contact with a solid object other than a prey, the whole body usually contracts rather rapidly.

On contact with a hard solid object Paramecium induces avoiding response.


During emergency which of the following hormone is secreted?

  • Aldosterone

  • Thyroxine

  • Adrenalin

  • Calcitonin




Adrenalin Aldosterone Thyroxine Calcitonin
Secreted by Chromaffin cells of adrenal medulla Secreted by adrenal cortex Produced in manufactured and synthesized from iodine Secreted by parafollicular cells of thyroid
Controlled by Autonomic Nervous System (ANS) Mineralocorticoid or salt retaining hormone Also called tri-iodothyronine hormone Also called Thyrocalcitonin (TCT) hormone.
Also called 'emergency hormone' Function is in conservation of sodium and water and dimination of potassium. Function is to control metabolism, regulating tissue growth and development. Main role is to lower the amount of calcium and phosphate in the blood.




Which of the following is a transparent tissue?

  • Tendon

  • Fibrous cartilage

  • Hyaline cartilage

  • All of these


Hyaline cartilage

Hyaline cartilage is the most abundant kind of cartilage with no fibres and transparent matrix. It is found upon articular surfaces at joints of long bones. It helps to from the nose, larynx, trachea, bronchi and bronchial tubes leading to the lungs.

Fibrocartilage (fibrous cartilage) carries thick dense bundles of white collagen fibres in matrix. They are the strongest cartilage. They occur in joints between vertebrae and also pubic symphysis.

Tendon is a very dense, strong fibruous connective tissue made of collagen fibres. Tendon connects a skeletal muscle to a bone.


In Pheretima, septa are absent between which segments?

  • 3/4 and 9/10

  • 4/5 and 8/9

  • 5/6 and 7/8

  • 7/8 and 6/7


3/4 and 9/10

In Pheretima posthuma (earthworm) septa are absent between 3/4 and 9/10 segments.


Which of the following cell type is capable of giving rise to other cell types in sponges?

  • Thesocytes

  • Pinacocytes

  • Cnidocytes

  • Archaeocytes



Archaeocytes are the totipotent cells, which provide great regenerating power to sponges. Sex cells (sperm and ova arise from undifferentiated archaeocytes).

Thesocytes are the amoebocytes with reserve food granules.

Pinacocytes are the polygonal flat cells present as outer layer of cells, called pinacoderm lining the spongocoel or body cavity in Leucosolenia.

Cnidocytes occur in entire epidermis except that of basal disc and are found only in cnidarians. These are spherical or oval cells.


Animals having a built in thermostat to maintain constant body temperature are known as

  • biothermic

  • poikilothermic

  • oligothermic

  • homeothermic



Homeothermic are the animals having a nearly uniform or constant body temperature. These animals are known as warm blooded animals, eg, birds, man.

Poikilothermic are those, having a variable temperature which fluctuates with that of environment. They are called the cold blooded animals, eg, reptiles, amphibians.


Which of the following is the largest gland in an adult man?

  • Thymus

  • Liver

  • Thyroid

  • Pancreas




Liver Thyroid Gland Pancreas Thymus gland
Endodermal in origin Length- 3 to 7 cm; Weight- 25gms Length- 12- 15 cms; Weight- 50- 70 gm Weight- at birth- 10 to 12 gms; at puberty- 20 to 30 gms; at old age- 3 to 6 gms
Largest gland in human body  Largest endocrine gland Heterocrine (mixed) gland Has immunological functions
Secretes bile which is used in the emulsification and absorption of fats. Location- below larynx Hormones secreted are insulin, glucagon and somatostatin After puberty it is not clearly visible.
Produces heparin, plasma protein (albumin, fibrinogen and prothrombin) etc. Produces thyroxine (T4)- controlsbasal metabolic rate of the body    


Rh factor is present in

  • all vertebrates

  • all mammals

  • all reptiles

  • man and rhesus monkey only


man and rhesus monkey only

Rh factor was discovered by K Landsteiner and A S Wiener (1940) from rabbits immunized with the blood of monkey Macaca rhesus. It is found that it present in man and rhesus monkey only.


In rabbit, end of a long bone is connected in another by

  • tendon

  • ligaments

  • muscle

  • cartilage



Ligaments consist of mainly collagen fibres and some elastic fibres. It connects end of a long bone to another.

Tendon is a very dense, strong fibrous connective tissue made of collagen fibres. It connects a skeletal muscle to a bone.

Cartilage is a solid but semi- rigid and flexible connective tissue. cartilage like the fibrous tissues, is a vascular and nutrients must diffuse into it from nearby tissues.

Muscles are composed of muscle tissue, that contracts to affects a particular movement.