NEET Biology Solved Question Paper 2010

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.

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.

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.

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.

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.

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.

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.

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.

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.

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