Back to: P6 Primary six science topical questions and answers
REPRODUCTION IN BIRDS Qn. How do birds reproduce?
- By laying eggs
Qn. What type of fertilization do birds undergo? - Internal fertilization
A diagram showing the structure of an egg
Functions of each part of an egg. (a) Egg shell
- Protects the inner parts of an egg.
- The egg shell is porous to allow free circulation of air/gaseous exchange.
Qn. How is the egg shell adapted to gaseous exchange? - It is porous to allow gaseous exchange.
Qn. Identify the mineral salts that harden the egg shell. - Calcium.
- Phosphorus.
(b) Air space - Keeps and provides oxygen to the embryo.
(c) Chalaza / twisted albumen - It holds the embryo and yolk in the central position.
- It is a passage of oxygen from the air space to the embryo.
(d) Egg yolk - It provides proteins and fats to the growing embryo.
(e) Albumen - It provides water and proteins to the growing embryo.
(f) Embryo / germinal disc - Develops into a youngone.
(g) Shell membrane - Prevents the albumen from pouring.
FEEDING IN BIRDS - Birds use beaks to feed.
Qn. Why are birds fed? - To grow well.
- To keep the bird’s body healthy.
- To enable birds lay many eggs.
- To enable birds lay eggs with hard egg shell.
- To enable birds grow fatter/put on weight.
The alimentary canal of a bird
Functions of each part.
(i) Beak
- For picking food
(ii) Gullet - Acts as a food passage to the crop.
(iii)Crop - Stores, softens and moistens food.
(iv)Gizzard - The gizzard crushes food into small particles by the help of grit.
(v)Small intestines - The small intestines absorb digested food.
Note: - Digestion of food ends in the small intestines.
(vi]Large intestines
- Large intestines allow absorption of water to take place.
(vii) Caeca - It is where undigested food is stored for sometime before it is passed out as droppings.
(viii) Vent - It acts as a passage of droppings out of the bird’s body.
- Qn. State the importance of the nostril to a bird .
- For smelling
Leave a comment