How well do you understand living things and their vital processes? Whether you are preparing for JAMB, WAEC, NECO and Post-UTME, these Biology past questions and answers cover such subjects as the chemistry of life, botany, evolution, genetics, ecology etc to help you know what to expect, improve your speed and confidence and be really prepared for the actual aptitude test.
I, II, III, IV
I, IV, III, II
II, III, IV, I
IV, III, II, I
Correct answer is D
Evolutionary sequence in vertebrates: Fishes → Amphibians → Reptiles → Birds → Mammals.
IV → III → II → I
The two key cations involved in the action potential of nervous transmissions are
Na+ and Fe2+
Mg2+ and K+
Na+ and K+
Fe2+ and Mg2+
Correct answer is C
The Na⁺ / K⁺ - helps maintain resting potential, affects transport, and regulates cellular volume.
If a DNA strand has a base sequence TCA, its complementary strand must be
ATG
TAG
GAT
AGT
Correct answer is D
The complementary strand for TCA is AGT
| A | T |
| G | C |
| T | A |
| C | G |
| A | T |
| T | A |
| G | C |
| A | T |
the tank was too small compared to the large ocean
the body cells of the fish swelled and burst as a result of the hypotonic fresh water
the body cells of the fish shrank as their sap was hypertonic to the freshwater
there was no food in the tank, so the fish starved
Correct answer is B
Saltwater fish can't survive in freshwater because their bodies are highly concentrated of salt solution (too much for freshwater). The water would flow into their body until all their cells accumulate so much water that they bloat and die eventually.
35%
16%
46%
23%
Correct answer is C
No of Imperata spp = 23
Total plant species = 50
Percentage of imperata spp = \(\frac{23}{50} * 100℅\)
= 46℅