NEET Biology Solved Question Paper 2010

Class- Insecta of Phylum- Arthropoda, is characterised by the presence of three pairs of legs and absence of respiratory pigments in blood, eg, cockroach, mosquito.

In cockroach, respiration is aerobic and oxygen goes into tissues by diffusion through the trachea.

Tube feet are extensible tubular processes bearing suckers and present in rows on the under surface of Echinoderms. These are connected internally with water vascular system. Each tube foot has an ampulla, a podium and a sucker. These are sensory structures that take part in adhesion, locomotion, respiration and food capturing. 

Jelly fish is a member of Phylum- Coelenterata. Scoiliodon is a fish and silver fish is an arthropod.

Follicle Stimulating Hormone (FSH) is a glycoprotein secreted from anterior lobe of pituitary. It is secreted in both males and females. In males, it stimulates spermatogenesis and development of seminiferous tubules and in females, it stimulates formation and growth of ovarian follicle in ovary. 

Virus is a nucleoprotein particle. It is made up of an outermost covering known as envelope, a protein coat, ie, capsid and a core of nucleic acid. During its reproduction, multiple cpoies of envelope capsid and nucleic acids are formed inside the host cells.

Since, ribosomes are absent in virus cells. Therefore, they are not reproduced during reproduction of viruses.

During strenuous excercise, anaerobic respiration of glucose takes place and Pyruvic acid (a product of glycolysis of glucose) changes into lactic acid. Accumulation of lactic acid is responsible for muscle fatigue. Glycogen is a polysaccharide and stroing material of animal body. It is stored in muscle and liver.

Starch is also a polysaccharide but a storing material of plant body.

Two types of photoreceptor cells are present in retina, ie, rods and cones.

(i) Rods : These cells are active in dark rhodopsin, a vision pigment is present in rods. In strong light, rhodopsin is bleached due to splitting of its two components, ie, scotopsin and retinal.

(ii) Cones : These cells are active in strong light. Iodopsin a pigment is present in cones. These cells produce hare coloured image in bright light.

Glycine is the simplest and smallest amino acid. A compound is said to be optically active, when a chiral or asymmetrical carbon (ie, carbon attached to four different groups or atoms) is present. Since, chiral carbin is absent in glycine, it does not show optical activity. Other amino acids such as Valine, Leucine and Isoleucine etc contains atleast one chiral carbon, therefore, are optically active.

Ear ossicles are three small non- supporting bones of body, present in middle ear of human. They are responsible for transmitting and amplifying vibrations received from tympanum.

All members of Phylum- Echinodermata are marine. Therefore, Echinoderms are marine, spiny skinned animals. They have water vascular system for locomotion, eg, starfish, Antedon.

Arboreal insects lives on trees. Freshwater forms are animals or plants living in fresh water of ponds, eg, Hydrilla.