Question 1
- Define the following terms as used in Biology.
(i) Chemosynthesis
(ii) Mutualism - State the importance of photosynthesis in nature.
Answer
- (i) Chemosynthesis - Process whereby non-green /some bacteria utilize energy derived from chemical reactions in their bodies to manufacture food from simple substances in the environment;
(ii) Mutualism - Mode of nutrition/feeding relationship, between two organism where both organisms benefit - - Regulation of carbon (IV) oxide and oxygen gases in the environment.
- Enables autotrophs make their own food meet their nutritional requirements
Question 2.
What is the importance of the stroma in the chloroplast?
Answer
- Contains enzymes necessary for photosynthesis
- Forms site for light independent reactions.
- Forms site for light independent reactions.
Question 3
Name two cell structures that synthesize the following cell organelles
(a) Ribosomes
(b) Lysosomes
Answer
(a) Nucleolus
(b) Centriole
(b) Centriole
Question 4
Name three plant leaf excretory products
Answer
- Quinine
- Khat
- Papain
- Khat
- Papain
Question 5
A student mixed a sample of urine from a patient with Benedict’s solution and boiled the mixture.The colour changed to orange
(a) What was present in the urine sample?
(b) What did the student conclude about the health status of the patient?
(c) Which organ in the patient may not be functioning properly?
Answer
(a) Reducing sugars/Glucose/Monosaccharides
(b) The patient has diabetes mellitus
(c) Patient’s pancreas isn’t functioning well/Pancreas producing very little/insufficient insulin.
(b) The patient has diabetes mellitus
(c) Patient’s pancreas isn’t functioning well/Pancreas producing very little/insufficient insulin.