WAEC Biology Past Questions

In the egg of bird, the embryo is located in the

1. a.Chalaza
2. b.Yolk
3. c.albumen
4. d.embryo

The dark reaction of photosynthesis involves the

1. a.reduction of carbon (IV) oxides to organic compounds
2. b.release of oxygen and the splitting of water
3. c.photolysis of water and the production of starch
4. d.splitting of water into hydrogen ions.

Excess water in plants is excreted as water vapour and droplets respectively through

1. a.respiration and guttation
2. b.transpiration and guttation
3. c.photosynthesis and guttation
4. d.guttation and condensation

When bacteria swim from cold to warm regions, this is known as

1. a.negative chemotaxis
2. b.positive thermotaxis
3. c.positive phototaxis
4. d.negative phototaxis

Hydrostatic skeleton is the type of supporting system found in

1. a.Mammals
2. b.reptiles
3. c.oligochaetes
4. d.arthropods

Which of the following is a homeostatic response in humans?

1. a.withdrawing the hand from a hot object
2. b.the mouth getting watery when food is lighted
3. c.yawning owing to tiredness
4. d.shivering in a cold environment

The optimal temperature for breeding cockroaches is

1. a.15oC
2. b.19oC
3. c.24oC
4. d.33oC

At which temperature will cockroaches not survive after 10 days?

1. a.15oC
2. b.19oC
3. c.24oC
4. d.33oC