Post Utme Biology Past Questions and Answers

Question 166:

Water is required for seed germination to take place because it ____________

A. Activates the enzymes
B. Softens the testa
C. Liberates energy for growth
D. Permits radicle growth
E. Allows oxygen to diffuse into the seed

Question 167:

If an organic compound has its hydrogen:oxygen ratio as 2:1, it is likely to be ____________

A. A protein
B. A carbohydrate
C. A fat
D. A fatty acid and glycerol
E. An amino acid

Question 168:

The movement of a plant in response to external stimulus of no particular direction is ____________

A. Taxism
B. Tropism
C. Haptotropic movement
D. Nastic movement
E. Phototropism

Question 169:

'Jointed skeleton' is absent in the ____________

A. Cockroach
B. Spider
C. Millipede
D. Snail
E. Dragon fly

Question 170:

In a Biuret test, some protein was mixed with sodium hydroxide solution, which of the following chemicals should be added to the mixture for positive result?

A. Mercurous nitrate
B. Copper sulphate
C. Mercuric nitrate
D. Sodium Carbonate
E. Ammonium hydroxide