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NEET Biology Solved Question Paper 2008

Multiple Choice Questions

1.
You are required to draw blood from a patient and to keep it in a test tube for analysis of blood corpuscles and plasma. You are also provided with the following four types of test tubes. Which of these will you not use for the purpose

Test tube containing calcium bicarbonate

Chilled test tube

Test tube containing heparin

Test tube containing sodium hydroxide

Test tube containing heparin

Clotting of collected blood can be prevented by

1) coating test tubes with silicon (which produce non wettable surface similar in its smoothness to endothelial lining of blood vessels).

2) adding chelating agents (includes trisodium citrate, sodium oxalate and sodium EDTA) which remove calcium which is important for blood coagulation, and prevent blood clotting.

3) adding heparin, most powerful anticoagulant which acts indirectly by activating plasma antithrombin III. Heparin is effective both in vivo and in vitro. Whereas the option a, b and d are effective in vitro. Heparinized blood is not suitable for blood counts (as it alters the shape of RBC's and WBC's which affects blood testing), Fragility testing and complement fixation tests.

Cattle fed with spoilt hay of sweet clover which contains dicumarol

are healthier due to a good diet
catch infections easily
may suffer vitamin K deficiency and prolonged bleeding
may suffer from beri-beri due to deficiency of vitamin B₁

Which one of the following methods is commonly used to maintain the genetic traits of a given plant

By propagating through seed germination
By propagating through vegetative multiplication
By generating hybrids through intergeneric pollination
By treating the seeds with gamma radiations

Phytohormones are

hormones regulating growth from seed to adulthood
growth regulators synthesised by plants and influencing physiological process
hormones regulating flowering
hormones regulating secondary growth.

One common example of simple reflex is

tying your shoe laces while talking to another person and not looking at them
watering of mouth at the sight of a favourite food
climbing up a stairs in dark without stumbling
closing of eyes when strong light is flashed across them.

Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms.

Perianth and two integuments
Embryo development and apical meristem
Absence of resin duct and leaf venation
Presence of vessel elements and absence of archegonia

Injury to vagus nerve in humans is not likely to affect

tongue movements
gastrointestinal movements
pancreatic secretion
cardiac movements.

Which one of the following is a matching pair

Lubb - Sharp closure of AV valves at the beginning of ventricular systole
Dup - Sudden opening of semilunar valves at the beginning of ventricular diastole
Pulsation of the radial artery - Valves in the blood vessels
Initiation of the heart beat - Purkinje fibres