Exam Q Mistakes

Question 1

Name the component of food classified on the basis of solubility

Answer 1

Vitamins

Question 2

What property of water is responsible for the efficiency of both sweating and transpiration as a method of temperature regulation?

Answer 2

Good absorber of energy

Question 3

State two functions of minerals in organisms

Answer 3

• form rigid structures
• form soft tissue

Question 4

State two causes of variation

Answer 4

Meiosis
Mutations

• only answers given in MS

Question 5

Identify the term used to describe the passing on of genes from parents to offspring

Answer 5

Inheritance

Question 6

Name the structure to which the stirrup is attached

Answer 6

Oval window

Question 7

Why is it necessary to have three semi-circular canals?

Answer 7

To control balance in three planes

Question 8

What is nitrogen fixation

Answer 8

The conversion of atmospheric nitrogen to a usable form

Question 9

Name one type of animal cell that does not have mitochondria

Answer 9

Red blood cell

Question 10

Name the structure inside each villus that absorbs the products of lipid digestion

Answer 10

Lacteals

Question 11

Give an example of an application of tissue culture using animal tissue

Answer 11

Cancer research
Skin graft

Question 12

What is an antibody?

Answer 12

A protein produced by a white blood cell in response to a specific antigen

Question 13

Explain why the human circulatory system is a closed system

Answer 13

Blood is always enclosed in vessels and the heart while circulating throughout the body

Question 14

Distinguish between symbiosis and parasitism in relation to ecology

Answer 14

Symbiosis → a close relationship between 2 species where at least one benefits
Parasitism → lives in or on another organism causing harm

Question 15

Identify the hormone responsible for ovulation

Answer 15

Luteinising hormone

Question 16

Where is progesterone produced during the initial stages of pregnancy (weeks 1-12)?
Where is it produced after this?

Answer 16

Corpus luteum

Placenta

Question 17

State one cause of male infertility and suggest a corrective measure for it

Answer 17

Low sperm count

Exercise, improve diet, reduce stress

Question 18

Name the site of action of lipase

Answer 18

Duodenum

Question 19

Describe one function of bile in the process of digestion

Answer 19

Emulsification
Raise pH

Question 20

State three factors that can cause a decline in future human populations

Answer 20

Disease
Famine
War
Pollution
Natural disasters
Decrease in birthdate

Question 21

In relation to body temperature, what term describes an animal such as a mouse?

Answer 21

Endotherm