Biology Paper 2 Questions - Mumias West Pre Mock Exams 2023

INSTRUCTIONS TO CANDIDATES.

1. This paper consist of TWO section A and B
2. Answer ALL the questions in section A in the spaces provided
3. In section B answer question 6 (compulsory) and either question 7 or 8 in the spaces provided after question 8.

For examiners use only:

QUESTIONS

SECTION A (4OMKS)
Answer ALL the questions in this section in the spaces provided.

1. The diagram below represents a food web in a terrestrial ecosystem.
   
   
   1. Which organism has the highest number of preys (l mk)
   2. Construct food chains with snakes as tertiary consumers (2mks)
   3. State the trophic level occupied by hawks in the food chains constructed in b) above (lmk)
   4. Describe how capture-recapture method can be used in estimating the population of fishes in a lake. (4mks)
2. Study the diagram below and answer the questions that follow.
   
   
   1. Name the part labeled A and B (2marks)
   2. State the function of the part labeled C (2marks)
   3. How is the part labeled E adapted to its function (2marks)
   4. Identify the structure that perform the same function as one illustrated above in (2marks)
      
      1. Amoeba
      2. Fish
3.                      
   1. What is multiple allelism? (1mk)
   2. A pure breeding black male mouse was mated with a pure breeding brown female mouse.
      All the offspring had black coat colour.
      Explain the appearance of black coat colour in the offspring. (1mk)
      1. If the black parental mouse was mated with a mouse that is heterozygous for coat colour, work out the genotypic ratio of the offspring. Show your working. (4mks)
      2. State two disorders in human beings that are as a result of chromosomal mutation. (2mks)
4.                  
   1. Explain what happens to excess amino acids in the liver of humans (3mks)
   2. Name two parts of human nephron which are only found in the kidney cortex. (2mks)
   3.                
      1. In what form is carbon(ii) oxide transported in blood. (1mk)
      2. Explain why it may cause death (2mks)
5. The diagram below indicates an organism that grows under shaded places with damp conditions. Study it and answer the questions that follow.
   
   
   1. Name the division to which the specimen belongs. (1 mark)
   2. Name and state the functions of the parts labelled Q, R and S. (6 marks)
   3. Name the two body forms of the organism in its alternation of generation. (1 marks)

SECTION B (40 MARKS)
Answer question 6 compulsory and either 7 or 8 in the spaces after question 8.

6. The following data results of making daily growth measurement on an organism over a period of 24 days during its development.
   

   DAY	WIDTH OF HEAD (MM)	LENGTH          OF FEMUR 1MM	HIND
   1	3.0	7.0
   2	3.5	7.5
   3	4.0	8.0
   4	4.0	8.0
   5	4.0	8.0
   6	4.0	8.0
   7	4.0	8.0
   8	4.4	9.2
   9	4.7	10.5
   10	5.0	12.0
   11	5.0	12.0
   12	5.0	12.0
   13	5.0	12.0
   14	5.0	12.0
   15	5.0	12.0
   16	5.0	12.0
   17	5.6	13.3
   18	6.4	14.8
   19	7.0	16.4
   20	7.6	18.0
   21	7.6	18.0
   22	7.6	18.0
   23	7.6	18.0
   24	7.6	18.0

   1. Using a suitable scale, draw graphs of width of head and length of femur against time. Draw the graphs on the same axis. (8 marks)
   2.                    
      1. Name the growth pattern represented by the graphs. (1 mark)
      2. With reference to your graph, identify the phylum to which the organism belongs. Give a reason for your answer. (2marks).
   3.              
      1. Account for the length of hind limb (femur) between day 3 and day 7. (3 marks)
      2. Day 7 and day 10. (2 marks)
   4. State the hormones involved in the growth pattern represented by the graphs. (2 marks)
   5. State two advantages for metamorphosis in organisms. (2 marks)
7.                        
   1. Describe the structural adaptations of mammalian heart to its functions (10mks).
   2. Explain the role of osmosis in organisms (10mks)
8. Describe the movement of water from the soil up to the leaves and then into the atmosphere. (20 marks)