Question 1
(a) What is haemophilia?
(b) State two symptoms of the condition above
Answer
(a) A condition in which blood does not clot well or does not clot ;
(b) Blood takes long to clot;
- Bleeding for long
(b) Blood takes long to clot;
- Bleeding for long
Question 2.
(a) Name two photo chemical cells in the human retina
(b) Name one chemical substance and two mineral ions involved in impulse transmission in mammals
Answer
(a) - Rod cells
- Cone cells
(b) Chemical substance - Acetylcholine
Mineral ions - sodium,potasssium,chloride ions;
- Cone cells
(b) Chemical substance - Acetylcholine
Mineral ions - sodium,potasssium,chloride ions;
Question 3
State three characteristics of a species
Answer
- Closely related members;
- They interbreed;
- They produce viable offsprings;
- They interbreed;
- They produce viable offsprings;
Question 4
State why iodine is necessary for complete development of a tadpole into adult
Answer
Iodine is necessary for formation of thyroxine hormone (by thyroid glands); thyroxine hormone influences metamorphosis
Question 5
Name the main feature that differentiate the axis from other cervical verterbrates
Answer
Odontoid process;