Biology Paper 1 Questions - Bondo Joint Mocks Exams 2022

Questions

Instructions to candidates

• Answer ALL questions in the spaces provided.
• All workings MUST be clearly shown where necessary.

1.    
   1. Explain the role of decomposers in an ecosystem. (2 marks)
   2. With reference to the leaves only give two adaptations of submerged hydrophytes. (2 marks)
2.  
   1. Name the part of the human eye where image is formed. (1 mark)
   2. State two characteristics of the image formed on the part named in a) above. (2 marks)
3. A layer of glycerine was applied on upper surface of a freshwater floating plant that had been kept in the dark for 24 hours. The plant was left undisturbed in bright light. After three hours test for starch carried out on the leaves produced a brown colour of iodine solution. Account for the observation. (3 marks)
4. A form four student was walking around the school compound and noticed that the leaves of Nandi flame tree had fallen on the ground.
   1. Name the hormone responsible for this phenomenon. (1 mark)
   2. State the significance of the above phenomenon to the tree. (2 marks)
5. Study the diagram below and answer the questions that follow.
   
   
   1. Name the structures labelled 3 and 5. (2 marks)
   2. What is the function of the part marked 4? (1 mark)
   3. How is the part labelled 7 adapted to its function? (2 marks)
6.  
   1. During oxidation of certain food substances, the respiratory quotient was found to be 0.718.
      1. Name the type of food substance being oxidized. (1 mark)
      2. State two advantages of using the food substance named. (2 marks)
   2. Give a reason why it is difficult to calculate Respiratory Quotient (RQ) in plants. (1 mark)
7. The diagram below represents a cell at one stage of cell division.
   
   
   1. Identify the stage. (1 mark)
   2.   
      1. Is the cell from a plant or an animal? (1 mark)
      2. Give a reason for your answer in b) i) above. (1 mark)
8. The quantity of urine passed per day was measured in four mammals; A, B, C and D of the same species in their natural habitats. The results were as shown below.
   
   
   1. Which of the four mammals is likely to be living in a desert? (1 mark)
   2. In what form is nitrogenous waste most likely to be excreted by animal D?
      Explain. (2 marks)
9. In the pumping mechanism of the human heart, name the valve which opens during :
   1. Systole………………………………………………………………. (1 mark)
   2. Diastole…………………………...............………………………..... (1 mark)
10. State the branch of Biology that would be used in solving the problem of disputed parentage. (1 mark)
11. Explain why carbohydrates are stored in their polysaccharide forms in both plants and animals. (1 mark)
12. Name the organelle that is abundant in:
    1. Goblet cells ..................................................................... (1 mark)
    2. Kidney cells..................................................................... (1 mark)
13. State two roles of the jelly-like substance surrounding the eggs laid by frogs in water.
14. The diagram below represents a villus from the ileum lining.
    
    
    1. Identify two adaptations of the ileum to its function that are observable from the diagram. (2 marks)
    2. Explain why it is necessary for blood from the gut to pass through the liver before joining general circulation. (2 marks)
15. A biological washing detergent contains enzymes which remove stains like mucus and oils from clothes which are soaked in water with the detergent.
    1. Name the two groups of enzymes that are present in the detergent. (2marks)
    2. Why would the stains be removed faster with the detergent in water at 35C rather than at 15°C? (2marks)
16. Explain why a pregnant woman excretes less urea in her urine compared to a non- pregnant one. (2 marks)
17. The images shown below were taken from a given experiment during germination of a seed. Use the images to answer the questions that follow.
    
    
    1. Name the part labelled C (1 mark)
    2. State the function of the part labelled D (1 mark)
    3. Name the type of germination shown above. (1 mark)
    4. Explain how the part labelled A is raised above the soil level. (2 marks)
18. The diagram below shows various types of gene mutations.
    
    
    1. Identify the type of gene mutation I (1 mark)
    2. Name one disorder that results from gene mutation II. (1 mark)
19. The diagram below shows regions of a root tip.
    
    
    1. What is the function of the part labelled K? (1 mark)
    2. Name the region marked L. (1 mark)
    3. Give one characteristic of the cells in the region labelled Q. (1 mark)
20.   
    1. State two limitations of fossil records as an evidence for organic evolution theory. (2 marks)
    2. State an idea that led to the formulation of Lamarck’s theory of evolution. (1 mark)
21. Explain what happens to red blood cells placed in distilled water for 20 minutes.(3 marks)
22. Below is a photograph of an organism in phylum Arthropoda.
    
    
    1. Name the class to which the organism belongs (1 mark)
    2. Give two reasons for your answer in i) above. (2 marks)
23. Explain why it is necessary for an athlete to breathe faster and deeply after running. (2 marks)
24. Give two main reasons why plants do not require an elaborate excretory system like animals (2 marks)
25. Study the diagram of a mammalian bone below and answer the questions that follow.
    
    
    1. Name the part labeled P (1 mark)
    2. How is the above bone adapted to its function? (2 marks)
26. The figure below illustrates the relationship between a developing foetus and the maternal tissues.
    
    
    1. Give two roles of the part labelled K. (2 marks)
    2. Name the blood vessel in L that transports metabolic wastes from the foetus to K.(1 mark)
27.     
    1. Name two structures for gaseous exchange in aquatic plants. (2 marks)
    2. Explain why guard cells have thicker inner walls and thinner outer walls. (2 marks)
28. Explain why it is not possible to suffocate and kill a locust by holding its head inside water. (1mark)