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NEET Biology Solved Question Paper 2005

Multiple Choice Questions

1.
Based on cellular mechanisms there are two major types of regeneration found in the animals. Which one of the following is the correct example of the type mentioned?

Morphallaxis - Regeneration of two transversely cut equal pieces of a Hydra into two small Hydras

Epimorphosis - Replacement of old and dead erythrocytes by the new ones

Morphallaxis - Healing up of a wound in the skin

Epimorphosis - Regeneration of crushed and filtered out pieces of a Planaria into as many new Planarians

Morphallaxis - Regeneration of two transversely cut equal pieces of a Hydra into two small Hydras

Morphallaxis is the type of regeneration in which lost body parts are replaced by the remodelling of the remaining tissue. In this type, little or no cellular proliferation takes place. Eg, Hydra.

When a Hydra is cut into two pieces, two Hydra will be regenerated, both smaller than the parental Hydra. Once regeneration is completed, the two Hydra can continue to grow and reach the size of their original parent.

Epimorphosis require active cellular proliferation prior to the replacement of the lost body part. Eg, Planarian are flatworms, regenerate using a mechanism in which pre- existing cells, known as neoblasts, begin to proliferate and migrate to the injured site in response to injury. These cells later form mass of proliferating cells known as regenration blastema. These further differentiate into specialized cells.

Which one of the following four secretions is correctly matched with its source, target and nature of action?

Secretion Source Target Action

Gastrin Stomach lining Oxyntic cells Production of HCl
Inhibin Sertoli cells Hypothalamus Inhibition of secretion of gonadotropin releasing hormone
Enterokinase Duodenum Gall bladder Release of bile juice
Atrial Natiuretic Factor (ANF) Sinu atrial node (SAN) M- cells of Atria Juxta- glomerular apparatus (JGA) Inhibition of release of renin

Which one of the following four glands is correctly matched with the accompanying description ?

Thyroid - hyperactivity in young children causes cretinism
Thymus - starts undergoing atrophy after puberty
Parathyroid - secretes parathormone which promotes movement of calcium ions from blood into bones during calcification
Pancreas - Delta cells of the Islets of Langerhans secrete a hormone which stimulates glycolysis in liver

Formation of non-functional methaemoglobin causes blue-baby syndrome. This is due to

excess of arsenic concentration in drinking water
excess of nitrates in drinking water
deficiency of iron in food
increased methane content in the atmosphere

Two of the body parts which do not appear in MRI may be

molar teeth and eye lens
scapula and canines
ligaments and ribs
tendons and premolars

Which one of the following statements is correct with respect to salt water balance inside the body of living organisms?

when water is not available camels do not produce urine but store urea in tissues.
Salmon fish excretes lot of stored salt through gill membrane when in fresh water
Paramecium discharges concentrated salt solution by contractile vacuoles
The body fluids of fresh water animals are generally hypotonic to surrounding water

The family containing mustard and its main characters are

Brassicaceae - Tetramerous flowers, six stamens, bicarpellary gynoecium, siliqua type fruit
Brassicaceae - Pentamerous flowers, many stamens, pentacarpellary gynoecium, capsule type fruit
Solanaceae - Pentamerous flowers, five stamens, bicarpellary gynoecium, berry type fruit
Poaceae - Trimerous flowers, three stamens, monocarpellary gynoecium, caryopsis type of fruit.