- Motor vehicles move, use energy and produce carbon (IV) oxide and water. Similar characteristics occur in living organisms yet motor vehicles are not classified as living. Explain. (3 marks)
- State one use for each of the following apparatus in the study of living organisms.
- Pooter (1 mark)
- Pitfall trap (1 mark)
- State the functions of the following cell organelles:
- Ribosomes (1 mark
- Lysosomes (1 mark)
- State the functions of the following parts of a light microscope.
- Fine adjustment knob (1 mark)
- Stage (1 mark)
- Why is it recommended to keep the stage of the microscope dry? (1 mark)
- Using a microscope, a student counted 55 cells across a field of view whose diameter was 6000mm (micrometers). Calculate the average length of the cells. Show your working. (2 marks)
- An experiment was set up as shown below.
The set up was left for 30 minutes.- State the expected results. (1 mark)
- Explain your answer in (a) above. (3 marks)
-
- Distinguish between diffusion and active transport. (2 marks)
- State one role that is played by osmosis in,
- Plants (1 mark
- Animals (1 mark)
- Name two mineral elements that are necessary in the synthesis of chlorophyll. (2 marks)
-
- State the functions of cristae in mitochondria. (1 mark)
- The diagram below represents a cell organelle.
- Name the part labelled Y. (1 mark)
- State the functions of the part labelled X. (1 mark)
- Name the end products of the light stage in photosynthesis. (2 marks)
-
- State the functions of co-factors in cell metabolism. (1 mark
- Give one example of a metallic co-factor. (1 mark)
- The action of ptyalin stops at the stomach. Explain. (1 mark)
- State two functions of carbohydrates in the human body. (2 marks)
- Name the tissues in plants responsible for:
-
- Transport of water and mineral slats. (1 mark)
- Transport of carbohydrates. (1 mark)
- Primary growth. (1 mark)
- Explain how the following contribute to the movement of water up the xylem vessels. (2 marks)
- Cohesion
- Adhesion
-
- Name the type of circulatory system found in members of the class insecta. (1 mark)
- Name the blood vessel that transports blood from:
- Small intestines to the liver (1 mark)
- Lungs to the heart (1 mark)
-
- Name one defect of circulatory system in humans. (1 mark)
- State two ways in which the red blood cells are adapted to their functions. (2 marks)
- Why would carboxyhaemoglobin lead to death? (2 marks)
- State four ways in which respiratory surfaces are suited to their function. (4 marks)
- Name the causative agents for the following respiratory diseases.
- Whooping cough (1 mark)
- Pneumonia (1 mark)
- Name the three end products of anaerobic respiration in plants. (3 marks)
- Give two factors that determine the amount of energy a human being requires in a day. (2 marks)
- Explain what happens when there is oxygen debt in human muscles. (3 marks)
-
- A person was found to pass out large volumes of dilute urine frequently.
- Name the disease the person was suffering from. (1 mark)
- Name the hormone that was deficient. (1 mark)
- A person was found to pass out large volumes of dilute urine frequently.
- What is the role of sweat in human body? (2 marks)
- Explain what happens to excess amino acids in the liver of humans. (3 marks)
- Explain why plants do not require specialized excretory organs. (4 marks)
- State three external differences between chilopoda and diplopoda. (3 marks)
-
- How are leaves of submerged plants adapted to photosynthesis? (2 marks)
- Name two disorders in human caused by gene mutation. (2 marks)
-
- State two functional differences between the rods and cones in the human eye. (2 marks)
- State two advantage of having an exoskeleton. (1 mark)
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