Which of the following organisms reduces nitrates in the soil to gaseous nitrogen?
Euglena
Protozoan
Denitrifying bacterium
Parasitic mould
Nitrifying bacterium
Correct answer is C
No explanation has been provided for this answer.
Which of the following mineral salts is a trace element?
Zinc
Carbon
Hydrogen
Potassium
Calcium
Correct answer is A
No explanation has been provided for this answer.
Which of the following is not a courtship behaviour exhibited by animals
Pairing
Display
Seasonal migration
Hibernation
Territorialism
Correct answer is D
No explanation has been provided for this answer.
The groups of sensory cells found on the upper surface of the tongue are called
ampullae
taste buds
nerve cells
somatic cells
tactile cells
Correct answer is B
No explanation has been provided for this answer.
There is an excess of potassium ions inside the axon and an excess of sodium ions outside
The inside of the axon becomes positively charged while the outside is negatively charged
There is an excess of sodium ions on the inner side of the axon
Chloride and potassium ions begin to move acrossthe membrane
Calcium ions accumulate on the upper side of the axon
Correct answer is A
No explanation has been provided for this answer.