The site for production of a ATP in a cell is

• A. ribosome
• B. cytoplasm
• C. Golgi body
• D. mitochondrion

Which of the following enzymes does not belong to proteases?

• A. Sucrase
• B. Pepsin
• C. Trypsin
• D. Erepsin

In testing for starch in a leaf, the leaf is boiled in alcohol to

• A. kill the cells
• B. soften the leaf
• C. enable chemicals penetrate the leaf
• D. decolourise the leaf

The colour that is associated with a positive iodine test is

• A. brown
• B. red
• C. blue-black
• D. yellow

A change in the environment of an organism is termed

• A. sensitivity
• B. impulse
• C. response
• D. stimulus

The mode of nutrition common to green plants is

• A. autotrophic
• B. heterotrophic
• C. holozoic
• D. saprophytic

(a) What is a balanced diet?

(b) Name the classes of food stating the importance of any two to the human diet.

(c) In a tabular form, state the source, substrate and end products of the following enzymes: (i) ptyalin: (ii) pepsin; (iii) lipase.

Biurete’s test is carried out on a food substance to indicate the presence of

• A. vitamins B
• B. fats
• C. proteins
• D. starch

Which of the following statements about nerve cells is not correct?

• A. The axons relay impulses from the cell Body
• B. The cell body is always found at the end of the neurone
• C. Each neurone has a cell body
• D. The dendrites of one neurone transmit impulses to the cell body

The amount of energy passed from one trophic level to the next decreases because

• A. many organisms are present at the first trophic level
• B. many organisms occur at the higher trophic level
• C. more energy is conserved at lower trophic levels
• D. parts of the organisms remain unutilised at each trophic level