Biology Questions and Answers - Form 1 End Term 3 2022 Exams

INSTRUCTIONS TO CANDIDATES:

• Answer ALL the questions
• Answers should be written in the spaces provided

1.  
   1. State one process that takes place during the light stage and one that takes place in the dark stage of photosynthesis. (2mks)
      
      1. Light stage;……………………………………………………………………………………………..
      2. Dark stage;……………………………………………………………………………………………..
   2. Name three products of the light stage of photosynthesis (3mks)
2. Name one example of the specialized cells in plants and one example in animals.
   1. Plants (1mk)
   2. Animals (1mk)
3. Identify the following apparatus and state its functions.
   
   1. Name………………………………………………………….(1mk)
   2. Function (1mk)………………………………………………….
4. A student measured the length of a mitochondrion on a photomicrograph whose magnification was X 40000 and found it to be 1mm. Calculate the actual size of the mitochondrion. (3mks)
5. State the type of solution that makes the plant cell. (2mks)
   1. Flaccid……………………………………………….……………………………………………………
   2. Turgid……………………………………………………………………………………………………
6. Name the carbohydrate stored in:
   1. Cell wall. ……………………………………………………………………………………. (1mk)
   2. Mammalian liver. …………………………………………………………………………. (1mk)
7. Name the monosaccharides that make up the disaccharides below
   1. Sucrose………………………………………………………………………………………….…(1mk)
   2. Lactose……………………………………………………………………………………………..(1mk)
   3. Maltose……………………………………………………………………………………………...(1mk)
8.  
   1. Name three characteristics of living organisms (3mks)
   2. Apart from Plantae and Animalia, name three other kingdoms. (3mks)
9. Draw a well labeled diagram show the external parts of a simple leaf (6mks)
10. Give two characteristics that distinguish scientific names from common names. (2mks)
11.  
    1. What is cell specialization (1mk)
    2. Name three types of tissues found in animals (3mks)
    3. Name three main types of lenses found on a light microscope (3mks)
12. The diagram below represents the digestive system in man. Study the diagram and answer the questions that follow
    
    
    1. Label the part K ,L, S and salivary glands M and P (5rnks)
    2. Name three hormones which are secreted along the alimentary canal (3mks)
13. List down four differences between a light microscope and an electron microscope (4mks)
14. List down four factors that determines energy requirements in human being: (4mks)
15. Define the following branches of Biology. (2mks)
    1. Genetics
    2. Entomology
16. State the functions of each of the following organelles.
    1. Nucleolus (1mk)
    2. Golgi apparatus (2mks)
17. The diagram below represents a longitudinal section of a human tooth.
    
    1. Identify the type of tooth. (1mk)
    2. Give one reason for your answer in (a) above. (1mk)
    3. State one function of the tooth. (1mk)
    4. State the function of the part labeled Q (1mk)
    5. Name the parts labeled P, Q, R, and S (3mks)

MARKING SCHEME

1.  
   1.  
      1. Light stage : Photolysis (1mk)
      2. Dark stage: Carbon (IV) fixation (1mk)
   2.  
      • Hydrogen ions
      • Adenosine triphosphate /energy rej; ATP
      • Oxygen
2.  
   1. In plants- Guard cells; root hair cells; palisade cells
   2. In animals- sperm cell; white blood cells; Red blood cells; nerve cells.
3.  
   1. pair of forceps’;
   2. picking up small stinging crawling animals;
4. Mag. = image size ; 1mm = 100m
                Actual size
   40000 = 1 x 1000μm
                  Actual size
   Actual size =  1000 μm ; = ¹/₄₀ = 0.015μm
                         40,000
5.  
   1. Hypertonic solution; acc. Highly concentrated solution (1mk)
   2. Hypotonic solution; acc. More dilute solution;
6.  
   1. Cellulose;
   2. Glycogen;
7.  
   • Glucose and fructose;
   • Glucose and galactose;
   • Glucose and glucose;
8.  
   1.  
      • Nutrition; Growth and development;
      • Respiration; Reproduction;
      • Gaseous exchange; Irritability;
      • Excretion; Movement;
        Mark the 1^st 3
   2.  
      • Monera;
      • Protoctista;
      • Fungi;
        Rej: If the name doesn’t begin with capital letter and wrong spelling.
9.  
   
   Mark any four correct
   Drawing 2mks
10.  
    • ( Two names used) first name – generic, second name species;
    • Two names italicized /underlined
    • Separately / first names capital, second; name small letter;
11.  
    1. Structural differentiation / modification of cells to perform specific function;
    2.  
       • Epithelial tissue;
       • Skeletal;
       • Blood;
       • Connective tissue; Mark the 1st 3
    3.  
       • Condenser lens
       • Objective lenses
       • Eye piece lens
12.  
    1.  
       • K – Liver
       • L- Oesophagus/gullet
       • S – ileum rej. Small intestines
       • M – Sublingual salivary glands
       • P- parotid salivary gland
    2.  
       • gastrin
       • Secretin
       • Cholecystokinin
13.  
    

    Light Microscope	Electron Microscope
    Low magnification power	High magnification power
    Low resolving/resolution power	High resolving/resolution power
    Uses light rays to illuminate specimens	Uses a beam of electrons to illuminate specimens
    Can be used to view both live and dead specimen	Used to view only dead specimen

14.  
    • basal metabolic rate
    • Age
    • S.A to volume ratio/ body size
15. Define the following branches of Biology. (2 marks)
    1. Genetics
       • Study of inheritance and variation
    2. Entomology
       • Study of insects
16.  
    1. Production of ribosomes.
    2.  
       • Packaging and transport of glycoprotein’s
       • Secretion of synthesized proteins and carbohydrates.
       • Production of lysosomes.
17.  
    1. Molar; accept pre-molar.
    2. Presence of two roots; presence of cusps; accept any one.
    3. chewing/crushing food;
    4. Detect stimuli;
    5.  
       • P - enamel
       • Q - nerve fibre
       • R - blood capillaries
       • S - pulp cavity