Sample Online Biology Paper 1

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Answer all the questions in the spaces provided.

  1. 1. (a) Name the cell organelle found in abundance in the white blood cells. (1 mark)

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(b) Give a reason for your answer in (a) above.                                           (1 mark)

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  1. c) Name the only epidermal cell in plants to contain chloroplast. ( 1mk)

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  1. State two observable features that place a millipede into its Class. (2 marks)

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  1. Which sets of teeth would be used in chewing sugarcane for maximum extraction of sap?   (2 marks)

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  1. A group of font two students placed a fresh leaf in warm water. They observed that air bubbles formed on the surface of the leaf.

(a) What biological process were they investigating?                      (1 mark)

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(b) Name the structures from which the air bubbles were coming from.    (1 mark)

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(c) Explain the distribution of the structures named in (b) above on the leaf surfaces of a land plant.               (2mks)

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  1. State why it is important for plants to lose water to the atmosphere. (3 mark)

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  1. The diagram below illustrates tissue fluid and cells surrounding a capillary.

 

 

 

 

 

 

 

 

 

(i) Name fluid G.                                                                                  (1 mark)

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(ii) Give two ways by which fluid G is different from tissue fluid.         (2 mark)

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  1. (a) Define respiration.       (1 mark)

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(b) State three activities in the human digestive system that depend on respiration.      (3 mark)

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  1. State three ways in which blood capillaries are structurally adapted to their functions. (3 mks)

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  1. The diagram below represents an organ in a bony fish.

(a) Name the organ.                                                                  (1 mark)

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(b) Describe how air in water reach the capillaries inside structure B.         (3 mark)

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  1. Name two products of respiration in plants. (2 marks)

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  1. (a) State one homeostatic role of the human skin. (1 mark)

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(b) Name three structures of the skin essential for its homeostatic function.  (3 mks)

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  1. Explain why the nephron is long and convoluted.             (3 marks)

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  1. State two limitations of using a quadrat to estimate the population of organisms.  

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  1. The diagram below illustrates a germinating seedling.

 

 

 

 

 

 

(a) Name the type of germination illustrated in the diagram.                     (1 mark)

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(b) Describe how the type of germination named in (a) above is brought about.                 (3 mks)

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  1. Explain why a bony fish dies shortly after being removed from water. (4 mark)

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  1. Julie observed eight onion epidermal cells across the field of view of a light microscope. If the field of view was 4mm in diameter, estimate the average size of the cells in micrometers (1mm= 1000m).  (2 marks)

 

 

 

  1. Explain the role of carbonic anhydrase in red blood cells.      (3 marks)

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  1. State the circulatory system found in members of the class Insecta.  (1 mark)

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     (b) Name the blood vessels that transport blood from:          (2 marks)

  • Small intestine to the liver.

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  • Lungs to the heart.

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  1. Name two methods plants employ to remove excretory waste products. 2 mks

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  1. 5C51 H98 06 + 145 O2 102 CO2 + 98 H2O

           The above equation shows an oxidation reaction of food substances.

 

  1. What do you understand by the term respiratory quotient? (1 mark)

 

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  1. Calculate the respiratory quotient of the oxidation of food substances. (2 mk)

 

 

 

 

 

  1. Identify the food substances. (1 mark)

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  1. (a) State two modifications on the kidney nephron of desert mammals.(2 mks)

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  1. b) State two structural differences between the veins and arteries. 2 mks

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  1. State two ways in which plants with weak stems obtain mechanical support. (2 marks)

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  1. What does the term binomial nomenclature mean? (1 marks)

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  1. a) Name the hard outer covering of the members of the phylum Arthropoda.   (1mark)

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      (b) Name the roles played by the structures named in (a) above.       (1marks)

 

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  1. Explain why a camel has a longer nephron than a whale. (1 mark)

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  1. Desert kangaroo rats spend most of their time in underground burrows.

(a) Name this type of behavioural activity (1 mark)

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(h) Explain the significance of this behaviour to the organism. (3 marks)

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  1. State two advantages terrestrial animals have in excreting urea as their main nitrogenous waste product.        (2 marks)

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27.A process that occurs in plants is represented by the equation.

C6H12O6                     2C2H5OH  +  CO2  +  Energy

  1. Name the above process. (1mark)

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  1. State two industrial applications of the above process (2 marks)

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