Biology Paper 1 Questions with No Answers - Maseno Mock Exams 2020/2021

Kenya Certificate of Secondary Education
231/1 - BIOLOGY -Paper 1
(THEORY)
DEC. 2020 - 2 hours

INSTRUCTIONS TO CANDIDATES

1. Answer all the questions in the spaces provided.
2. Answers must be written in the spaces provided in the question paper.

Questions

1. Name the method of specimen collection by use of;
   Pooter ……………………………………………........................................……… (1mark)
   Pair of forceps……………………………………………………………….. …….. (1mark)
   Sweep net …………………………………………………………………………... (1mark)
2. Below is a diagram of a specialized tissue
   
   
   1. Name the organ where above tissue is found (1mark)
   2. State two adaptations of the above tissue to its function (2marks)
3. Give three adaptive features in tilapia which reduces friction between the body and the water during locomotion. (3marks)
4. Explain how adequate water supply increases the rate of glucose formation in plants (3marks)
5.  
   1. What is coexistence as used in ecology? (1mark)
   2. Give two ways in which coexistence eliminates competition among herbivores living in the same habitat. (2marks)
6. A group of Maseno school students made the following set up during class experiment.
   
   
   1. What was the aim of the experiment? (1mark)
   2. State and explain the observation made in the flask. (3marks)
   3. Suggest a suitable control for the experiment (1mark)
7. Name the polysaccharide which offers mechanical support in ;
   1. Arthropods…………………………………………………………………………. (1mark)
   2. Plants ……………………………………………………………………………… (2marks)
8. The equation below represents a reaction which occurs during strenuous physical activities in human muscles.
   Glucose → compound B + 150kj
   1. Give two effects of the above reaction to an individual (2marks)
   2. State two ways in which compound B is eliminated from the muscle tissue. (2marks)
9. Color blindness is caused by a recessive gene located on X chromosome. The flowchart below shows transmission of the trait through three generations.
   
   
   1. What is the name of the above flowchart? (1mark)
   2. Using letter N to represent the gene for normal color vision, give the genotype of the male parent (1mark)
   3. Explain why the two sons in F1 generation have normal color vision yet their father is color blind. (2marks)
10.  
    1. Differentiate between transpiration stream and transpiration pull (2marks)
    2. Explain how the following features adapts the root hair cell for absorption of mineral ions of varying concentration in soil water.
       1. Large vacuole (1mark)
       2. Numerous mitochondria (1mark)
11. Nutrients are recycled in an ecosystem but energy is not recycled. Explain (2marks)
12. State three differences between photosynthesis and respiration (3marks)
    

    Photosynthesis	Respiration

13.  
    1. Explain how the endolymph performs its function in the process of hearing. (2marks)
    2. The diagram below shows the shoot of a live seedling, fixed to a rotating platform that is lit from one side only
       The platform was allowed to rotate for two days then left stationary for a further two days.
       
       
       1. Draw a diagram of the seedling only to show its appearance after day four. (1mark)
       2. State the aim of the above experiment (1mark)
14. The diagrams below illustrates three types of fruits
    
    
    1. State the modes of dispersal for fruits F and H (2marks)
       F…………………………………………………………………………………………….
       H…………………………………………………………………………………………….
    2. Identify the type of fruit G (1mark)
15.  
    1. What are fossils as used in evolution? (1mark)
    2. State two views of the theory of chemical evolution (2marks)
16. State two possible effects of long-term drug abuse on the brain (2marks)
17. The diagram below shows the effect of enzyme inhibition on the rate of enzyme reaction
    
    
    1. Identify the curve that represents the non-competitive inhibitors (1mark)
    2. Explain your answer in (a) above (2marks)
18. The diagram below represents a certain organism collected by a form three student at the sea shore.
    
    
    1. Name the class to which the organism belongs (1mark)
    2. Give two reasons for your answer in (a) above (2marks)
    3. Give one ecological role of this organism in its habitat (1 mark)
19. The diagram below shows part of kidney nephron. Use it to answer the question that follow.
    
    
    1. Name the parts labelled A and C (2marks)
       A…………………………………………………………………………………………….
       C……………………………………………………………………………………………
    2. Explain how the fluid in D is formed. (2marks)
20. Name two parts of human brain involved in osmoregulation (2marks)
21. Both inhalation and exhalation reduce the amount of carbon (IV) oxide in the mammalian blood. Explain (3marks)
22.  
    1. State the function of spiral bands of chitin in the tracheae of terrestrial insects. (1mark)
    2. Explain why mosquito pupae cannot stay for long under the water. (2marks)
23. Explain the role of the hormone oestrogen in the process of parturition (3marks)
24. The average length of the chicken egg is 55cm while that of the human ovum is 0.1mm. Explain (3marks)
25. State three roles of osmosis in human body (3marks)