Biology Trial Exams Paper 1 Questions - Alliance Boys High School Mock December 2020

INSTRUCTIONS TO CANDIDATES

1. Write your name and admission number in the spaces provided above,
2. Sign and write the date of the examination in the spaces provided above.
3. Answer all the questions.
4. Answers must be written in the spaces provided in the question paper.
5. Additional papers must not be inserted.
6. This paper consists of 10 printed pages.
7. Candidates should check the question paper to ascertain that all pages are printed as indicated.
8. Candidates should answer the questions in English.

For Examiner's Use Only

QUESTIONS

1. Name two support tissues in herbaceous plants. (2 marks)
2. State the role of cones in the eye. (2 marks)
3.                
   1. Which Biological discipline informed the ban of plastic bag use in Kenya? (1 mark)
   2. What property of the plastic bags necessitated the ban? (1 mark)
4. Name cell organelles that would be abundant in the following cells: (2 marks)
   1. A secretory cell.
   2. Muscle cell.
5. Define the following terms: (2 marks)
   1. Carrying capacity.
   2. Ecological niche.
6. Study the diagram below and answer the questions that follow.
   
   
   1. Name the process under investigation. (1 mark)
   2. State the property of structure that allows the process named above. (1 mark)
   3. State the significance of the above process in plants. (2 marks)
7. Define the term photosynthesis. (1 mark)
8. Give two disadvantages of external fertilization in amphibians. (2 marks)
9. A form three student at Alliance High School, set up the following experiment.
   
   
   1.  What was the aim of the experiment? (1 mark)
   2. Suggest and explain the expected observation if the setup is left for two days. (2 marks)
10. Name two disorders caused by mutation of sex chromosomes in humans. (2 marks)
11. State two applications of anaerobic respiration in industry (2 marks)
12. Why do living organisms eliminate metabolic wastes? (1 mark)
13. State two properties of starch. (2 marks)
14. Explain the significance of sunken stomata in xerophytes. (3 marks)
15.                          
    1. What was the limitation of Lamarck's theory of "use and disuse". (1 mark)
    2. Explain the concept of adaptive radiation. (3 marks)
16. Study the diagram below represents a bone obtained from a mammal.
    
    
    1. Identify the bone, (1 mark)
    2. State the functions of the structures labeled J and K. (2 marks)
    3. Identify the bone of the appendicular skeleton that articulates with the bone above. (1 mark)
17. Name a trait that exhibits discontinuous variation in animals. (1 mark)
18. State three differences between the products of mitosis and those of meiosis. (3 marks)
     

    Mitosis	Meiosis

19. List two functional proteins. (2 marks)
20. A student was asked to carry out a starch test on a leaf. Give a reason for the following activities.
    1. Boiling the leaf. (1 mark)
    2. Dipping the leaf in methylated spirit over a water bath. (2 marks)
    3. Rinsing the leaf with water. (1 mark)
21. Complete the following table of blood groups, with a tick (V) where blood groups are compatible and a cross (*) where they are incompatible. (4 marks)
    

    DONOR RECIPIENT	A	B	AB	O
    A			x	✓
    B			x	✓
    AB			✓	✓
    O			x	✓

22. Distinguish between diffusion and active transport (2 marks)
23. Account for stomatal closure, according to the starch-sugar interconversion theory. (4 marks)
24. State one adaptation of the inner membrane of the mitochondrion. (2 marks)
25. What are the salient features of the members of phylum Arthropoda. (3 marks)
26. The diagram below illustrates a response by a certain plain
    
    
    1. Name the type of response. (1 mark)
    2. What is the survival value of the response named in (a), above? (1 mark)
    3. Explain how the response named above occurs. (3 marks)
27. Give three functions of green plants in an aquatic habitat. (3 marks)
28. A food test was carried out on a urine sample from a young lady to determine if she was suffering from diabetes mellitus.
    1. What food test was carried out? (1 mark)
    2. What was the colour of the sample at the end of the test procedure if the test was negative? (1 mark)
    3. The hormone used to manage diabetes mellitus is administered intravenously, why can't it be administered orally? (1 mark)
    4. Name the hormone in (c), above. (1 mark)
29. What are the functions of water during germination? (3 marks)
30. What property of the cell membrane makes it:
    1. Temperature sensitive? (1 mark)
    2. Selectively permeable? (1 mark)