Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Acromegaly is due to hypersecretion of

  • insulin

  • thyroxine

  • growth hormone

  • None of these


C.

growth hormone

Growth hormone (GH) is secreted by anterior pituitary gland. It works with thyroid hormone and controls the normal growth. Hypersecretion (over production) of growth hormones in children causes the bones to grow unusually long. This results in a condition known as gigantism. But in adults, hypersecretion of growth hormone causes the bones of hands and face to thicken. This results in a condition called as acromegaly.


2.

If frog's brain is crushed, even then its leg moves on pinpointing. It is called

  • simple reflex

  • conditional reflex

  • neurotransmitter function

  • autonomic nerve condition


A.

simple reflex

If frog's brain is crushed even then its leg moves on pinpointng, is an example of simple reflex. It occurs without the involvement of brain. Simple reflex is controlled by spinal cord only.


3.

Which of the following is not a mental disorder?

  • Epilepsy

  • Neurosis

  • Psychosis

  • Plague


D.

Plague

Plague is also known as black death (due to dark blue areas of skin caused by haemorrhages). It is caused by a rod-shaped Gram negative bacterium, Yersinia pestis. This bacterium occurs in blood of rat and transmits from one rat to other by the rat flea, Xenopsylla cheopis.


4.

Gemmule formation in sponges are useful in

  • asexual reproduction

  • sexual reproduction

  • parthenogenesis

  • parthenocarpy


A.

asexual reproduction

Gemmules are asexual reproductive bodies of. sponges. These are formed by endogenous budding in all fresh water and some marine sponges.

Sexual reproduction involves viable male and female gametes.

Development of egg into an adult without fertilization is called parthenogenesis. It is common in honey bees.

Parthenocarpy is the development of seedless fruits.


5.

Sella turcica is found

  • near pituitary

  • in bones

  • in joints

  • near thyroid


A.

near pituitary

Sella turcica is found near pituitary gland. The pituitary is a small gland, laying in sella turcica of sphenoid bone and attached to hypothalamus of slender stalk.


6.

Which of the following is made up of a single bone in mammals?

  • Dentary

  • Hyoid

  • Upper jaw

  • All of these


A.

Dentary

Dentary is a tooth bearing membrane bone. In mammals, it is the lower jaw, consisting of single membrane bone on each side fused together in front.


7.

Spindle fibres of mitotic cell are made up of

  • tubulin

  • actin

  • myosin

  • collagen


A.

tubulin

Spindle fibres are formed during cell division. These are made up of tubulin. Each tubulin molecule is made up of a. and B sub-units. Tubulin molecules are attached heat to tail and form a strand and 13 strands aggregate to form a microtubule. These microtubules are attached to kinetochores of. metaphase chromosomes and play an important role in the movement of chromosomes during subsequent stages of cell division.


8.

Fifth cranial nerve of frog is called

  • vagus

  • trigeminal

  • optic

  • ophthalmic


B.

trigeminal

Trigeminal nerve is fifth cranial nerve of frog. It arises from lateral sides of medulla oblongata.

Vagus is a large mixed and tenth cranial nerve. It regulates the respiration rate, heart rate and digestive activities.

Optic is the second sensory cranial nerve, which brings in sight messages from eyes.

Olfactory is the first sensory nerve, which brings in smell messages from nose.


9.

Brunner's glands are present in

  • duodenum

  • oesophagus

  • ileum

  • stomach


A.

duodenum

Brunner's gland is found in submucosa of duodenum. It secrete an alkaline fluid composed of mucin, which exerts a physiologic anti-acid function by coating the duodenal epithelium, therefore protecting it from the acid chyme of the stomach.


10.

Systemic heart refers to

  • entire heart in lower vertebrates

  • the two ventricles together in humans

  • the heart that contracts under stimulation from nervous system

  • left auricle and left ventricle in higher vertebrates


A.

entire heart in lower vertebrates

Systemic heart refers to entire heart in lowervertebrates. It pumps the blood to different body parts and not to lungs.