Biology Paper 1 Questions and Answers - Maranda Post Mocks 2020/2021

1. The study of birds is referred to as? (1 mark)
2. A field of view had a radius of 2cm. A student observed 10 onion cells across the field of view. Calculate the size of each of the onions cells. (2 marks)
3. Below is a diagram of a certain circulatory system.
   
   
   1.  
      1. Identify the circulatory system. (1 mark)
      2. In which class would you find the animals with this type of circulatory system? (1 mark)
   2. Name the parts labeled A and B: (2 marks)
4. A food substance is suspected to contain proteins. Briefly describe the test you would carry out on the food substance to confirm that it contains protein. (4 marks)
5. The diagram below shows a certain stem twining clockwise around a support.
   
   
   1. Identify the type of response shown. (1 mark)
   2. Describe how the response occurs. (3 marks)
6. A man and a woman got a child who was an albino. What is the probability of their 5th and 6th children being albino? show your working (5 marks)
7. Why is it difficult to calculate the respiratory quotient (RQ) is plants? (2 marks)
8. Below is a sequence of the bases along the DNA strand.
   

   T

   C

   G

   A

   G

   C

   T

   A

   
   
   1. Draw a m-RNA strand that would be gotten from this DNA strand. (1 mark)
   2. State three structural differences between DNA and RNA. (3 marks)
9.  
   1. State the functions of oxytocin hormone in females. (2 marks)
   2. What is the role of luteinizing hormone in human in males? (2 marks)
10. Distinguish between transpiration and guttation. (2 marks)
11. The diagram below shows the structures of chromosomes.
    
    
    1. Name the parts labeled A, B and C. (3 marks)
    2. Identify the type of nuclear division illustrated in the diagram below. (1 mark)
12. The diagram below shows surface view of human brain.
    
    
    1. Name the parts labelled B and C. (2 marks)
    2. State what would happen if the part labelled B was damaged. (2 marks)
    3. State two functions of the part labelled A. (2 marks)
13. Name the type of response exhibited by the following.(3 marks)
    1. Leaves of Mimosa pudica when they fold after being touched.
    2. Euglena when it swims towards source of light.
    3. Sperms when they swim towards the ovum.
14. Distinguish between ligaments and tendons. (2 marks)
15. Most of the carbon (IV) oxide is transported from tissues to the lungs within red blood cells and not within the plasma. State two advantages of this mode of transportation. (2 marks)
16. A tilapia fish was found to be 40cm in length and its length from its anus to tail was 20cm.
    1. Calculate the tail power of the fish. (2 marks)
    2. What is the significance of a high tail power? (1 mark)
17. 
     
    1. Identify with a reason the nerve cell represented below. (2 marks)
    2. What is the function of this nerve cell? (1 mark)
18. The diagram below represents a fern plant.
    
    
    1. Name the parts labeled A and B: (2 marks)
    2. Name the division to which the plant belongs. (1 mark)
    3. State the function of the part labeled A. (1 mark)
    4. A camel stores fat in the hump primarily as water source. By what metabolic process would water be made available from fat? (1 mark)
19. State three functions of Golgi apparatus. (2 marks)
20. Explain the role of antidiuratic hormone when there is excess water in the human body. (3 marks)
21. Give one word for the following descriptions. (3 marks)
    1. Occurrence of deposits of insoluble salts uric acid, or amino acids in the kidneys.
    2. Occurrence of sugar in the urine due to insufficient insulin in blood.
    3. Infection of glomeruli by bacteria or virus.
22.  
    1. State three important events that occur during interphase of mitosis. (3 marks)
    2. In a certain flowering plant, the number of chromosomes in each cell in the radicle is 16. State the number of chromosomes in the: (3 marks)
       1. The zygote
       2. Cell of endosperm
       3. Generative nucleus
23. The diagram below show the results obtained in an experiment on growth of a bean seedling.
    
    
    1. Suggest the aim of the experiment. (1 mark)
    2. State the processes that occur in each of the regions marked: (2 marks)
24. Identify the respiratory surfaces used by the following organisms: (3 marks)
    
    1. Locust
    2. Nile perch
    3. Paramecium

Marking Scheme

1. Ornithology
2.  
3.  
   1.  
      1. Single circulatory system
      2. Class Pisces
   2. A - Gills
      B - Body (tissue)
4. Put 2ml/2cm³ of the food substance into a test tube; Add 2ml/2cm³ of NaOH solution and shake the mixture; Add CuSO₄ solution dropwise; Purple/violet color indicates presence of proteins.
5.  
   1. Thigmotropism/Haptotropism
   2. Contact causes lateral migration of auxins to the outer side of the stem; the higher concentration of auxins on the outer side; causes faster growth on the outer side than part in contact with the object;
6.  
7. Some CO₂ produced during respiration is used in photosynthesis; while some O₂ produced during photosynthesis is used in respiration;
8.  
   1. 
      

      A

      G

      C

      U

      C

      G

      A

      U

   2. DNA	RNA
      Double Strand	Single Strand
      Has deoxyribose sugar	has ribose sugar
      Has bases G,C,T & A (Has thymine)	Has bases G, C, U and Adenine (Has uracil)

9.  
   1. Stimulate milk release/ milk let down from mammary glands; stimulates contraction of myometrium during parturition
   2. Stimulates the production of androgens; by the interstitial cells of the testes.
10. Transpiration is the loss of water from plants in form of vapour through stomata/cuticle/lenticels while gutation is loss of excess of water in form of droplets through hydathodes;
11.  
    1. A - Chromatids
       B - Centromere
       C - Chiasma; Chiasmata
    2. Meiosis 1; reject meiosis only
12.  
    1. B - Cerebellum
       C- Medulla Oblongata
    2. Loss of muscle co-ordination / balance / posture
    3.  
       • controls learning/memory;
       • controls voluntary body movement/locomotion
       • site for intelligence
       • Integration of sensory impulses
13.  
    1. Haptonasty/thigmonasty
    2. Positive phototaxis
    3. positive chemotaxis
14. Ligament is a tissue that holds two or more bones together while tendons attach a bone to a muscle.
15.  
16.  
    1. Anus to tail tip  x 100%
       Mouth to tail tip 
       = ²⁰/₄₀ x 100; = 50%
    2.  
17.  
    1. Sensory neurone; - cell body off the axon
    2. transmits impulses from the receptors to the central nervous system
18.  
    1. A - Sorus / Sori;
       B - Rhizome
    2. Pteridophyta
    3. Encloses sporangia which produces spores
19.  
    • Secretion of synthesized proteins
    • production of lysosomes
    • packaging of glycoproteins
    • transport of glycoproteins