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    FORM 2 TERM OPENER EXAM IN PDF

    By Maverick JohnMay 31, 2025No Comments9 Mins Read

    Name:………………………………………….………………….Class:…………Adm No:…….

    BIOLOGY

    FORM 2 TERM 1 OPENER EXAM

    TIME: 1HR 30MINS

    INSTRUCTIONS.

    Answer all the questions in the spaces provided.

     

    1. State the function of the following organelles. (2mks)
    2. Lysosomes

     

     

    1. Ribosomes

     

     

    1. A student observed a row of 16 epidermal cells in a microscopic field that was 8mm in diameter. Calculate the average length of one cell in micrometres. Show your working.                                                                                                                                     (3mks)

     

     

     

     

    1. A student drew a 6cm diagram of a plant flower if the actual length of the flower was 12cm. calculate the magnification of the drawing made by the student. Show your working.                                                                                                                                     (3mks)

     

     

     

     

    1. State three factors that affect the rate of diffusion. (3mks)

     

     

     

     

    1. An experiment was set-up in a laboratory as shown below.

     

    1. What will happen to visking tubing in M and N after two hours. (2mks)

     

     

    1. Explain the observations made in M. (2mks)

     

     

    • What does visking tubing represent in a living organism?                         (1mk)

     

     

     

    1. Distinguish between autotrophism and heterotrophism modes of nutrition. (2mks)

     

     

     

     

    1. State three properties of monosaccharides. (3mks)

     

     

     

     

     

    1. The equation below shows formation of a disaccharide.

    Glucose + Glucose  process p      Q + water

    1. Name process P. (1mk)

     

    1. Product Q. (1mk)

     

    • Other than product Q named above name other two examples of disaccharides.                                                                                                                         (2mks)

     

     

    1. List four factors which affect enzyme controlled reaction. (4mks)

     

     

     

     

     

    1. Name two nutrients that are absorbed without being digested by the enzymes in humans.                                                                                                                                     (2mks)

     

     

    1. List three types of salivary glands. (3mks)

     

     

     

    1. Give two roles of saliva in the process of digestion. (2mks)
    2. Differentiate between homodonts and heterodonts. (2mks)

     

     

     

     

    1. The diagram below represents the lower jaw of a mammal.

     

     

    1. Name the mode of nutrition of the animal whose jaw is shown above. (1mk)

     

    1. Mode of feeding. (1mk)

     

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

     

    1. Diet of the animal. (1mk)

     

    1. Name the toothless gap labeled K. (1mk)

     

    1. Name the substance that is responsible for hardening of teeth. (1mk)

     

     

    1. State the roles of the structures found within a tooth:
    2. Blood vessels. (1mk)

     

    1. (1mk)

     

     

    1. List two major types of dental diseases. (2mks)

     

     

    1. Give two roles played by bile salts in the process of digestion. (2mks)

     

     

     

     

    1. Explain five ways in which the illume is adapted to its functions. (5mks)

     

     

     

     

     

     

     

     

     

     

     

     

    1. The following is a dental formula of a certain mammal.

    I0/3 C0/1 Pm3/3 m3/3

    1. Calculate the total number of teeth of the mammal. (2mks)

     

     

    1. Give the likely mode of feeding. (1mk)

     

     

    • Give a reason for your answer in (ii) above. (1mk)

     

     

    1. Name the disease in humans caused by deficiency the following: (5mks)
    2. Vitamin A

     

    1. Vitamin D

     

    • Vitamin C

     

    1. Iodine

     

    1. Iron

     

    1. State one function of water in the diet. (1mk)

     

     

     

     

    1. State five factors that determine energy requirements in human beings. (5mks)

    Name:………………………………………….………………….Class:…………Adm No:…….

     

    BIOLOGY

    MARKING SCHEME FORM 2 TERM 1 OPENER EXAM-AUGUST

    TIME:

     

    INSTRUCTIONS.

    Answer all the questions in the spaces provided.

     

    1. State the function of the following organelles. (2mks)
    2. Lysosomes

    Contain lytic enzymes that destroy worn out cells.

    1. Ribosomes

    They are sites for protein synthesis

    1. A student observed a row of 16 epidermal cells in a microscopic field that was 8mm in diameter. Calculate the average length of one cell in micrometres. Show your working.                                                                                                             (3mks)

    Size of one cell = diameter of field of view

                                Number of cells in field of view.

    8mm x 1000um

        1mm

    = 8000um

        16cells

    =500um

    1. A student drew a 6cm diagram of a plant flower if the actual length of the flower was 12cm. calculate the magnification of the drawing made by the student. Show your working.                                                                                                             (3mks)

    Magnification of a handlens = Drawing length

                                                      Actual length of the object

    6cm  = x0.5

    12cm

     

    1. State three factors that affect the rate of diffusion. (3mks)

    Diffusion gradient

    Thickness of tissues

    Size of molecules

    Temperature

    Type of medium

    Surface area to volume ratio

    1. An experiment was set-up in a laboratory as shown below.
    2. What will happen to visking tubing in M and N after two hours. (2mks)

    M – will swell / increase in size

    N – Will shrink / decrease

     

    1. Explain the observations made in M. (2mks)

    Sodium chloride solution is a hypertonic solution while distilled water is a hypotonic solution therefore distilled water molecules will move from the beaker to the visking tubing by osmosis making it to swell.

    • What does visking tubing represent in a living organism? (1mk)

    Cell membrane/ plasma membrane/plasmalema.

    1. Distinguish between autotrophism and heterotrophism modes of nutrition. (2mks)

    Autotrophism is a mode of nutrition in which some plants manufacture their own complex food substances from simpler substances such as carbon (IV) oxide and water while heterotrophism is a mode of nutrition that involves taking complex ready made food materials from plants and other animals.

    1. State three properties of monosaccharides. (3mks)

    They are soluble in water

    They form sweet tasting solution

    They are reducing sugars

    They are crystalisable.

    1. The equation below shows formation of a disaccharide.

    Glucose + Glucose  process p      Q + water

    1. Name process P. (1mk)

    Condensation

    1. Product Q. (1mk)

    Maltose

    • Other than product Q named above name other two examples of disaccharides.                                                                                                             (2mks)

    Sucrose

    Lactose

    1. List four factors which affect enzyme controlled reaction. (4mks)

    Temperature

    pH

    Specificity

    Enzyme co-factors and co-enzyme

    Enzyme inhibitors

    Substrate concentration and enzyme concentration.

     

    1. Name two nutrients that are absorbed without being digested by the enzymes in humans.                                                                                                                         (2mks)

    Water

    Vitamins

    Mineral ions/salts

    1. List three types of salivary glands. (3mks)

    Sublingual

    Sub-mandibular

    Parotial sub-maxillary

    1. Give two roles of saliva in the process of digestion. (2mks)

    Lubricates food

    Moistens food

    Softens food

    Dissolves food

    Contains salivary amylase hence digests starch to maltose

    Provides an alkaline medium for action of salivary amylase.

    1. Differentiate between homodonts and heterodonts. (2mks)

    Homodonts: are animals which have the same types, size and shape of teeth while heterodonts are animals with different types, size and shapes of teeth.

     

    1. The diagram below represents the lower jaw of a mammal.

     

     

     

     

     

     

     

     

     

     

     

     

    1. Name the mode of nutrition of the animal whose jaw is shown above. (1mk)

    Heterotrophism

    1. Mode of feeding. (1mk)

    Herbivorous

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

    Presence of a diastema

    1. Diet of the animal. (1mk)

    Vegetation/ grass/green leaves.

    1. Name the toothless gap labeled K. (1mk)

    Diastema

    1. Name the substance that is responsible for hardening of teeth. (1mk)

    Calcium phosphate

    1. State the roles of the structures found within a tooth:
    2. Blood vessels. (1mk)

    They supply nutrients to living tissues in the dentine.

    Remove waste products from the dentine

    1. (1mk)

    They detect heat, cold and pain in the tooth

    1. List two major types of dental diseases. (2mks)

    Dental carriers

    Periodontal disease

    1. Give two roles played by bile salts in the process of digestion. (2mks)

    They aid in the breakdown of fats into tiny fat droplets to increase their surface area for digestion (emulsification)

    They provide an alkaline medium which the enzymes work best.

    They neutralize the acidic chime from the stomach.

    1. Explain five ways in which the illume is adapted to its functions. (5mks)

    Long and narrow to increase surface area for digestion and bring digested food into close contact with walls of the ileum for easier absorption.

    Highly coiled to slow down movement of food thus allowing more time for digestion and absorption to take place.

    Large number of villi and micro-vill to increase surface area.

    Presence of thinner layer of cells to reduce diffusion distance of digested food.

    Presence of dense network of capillaries in the villi into which amino acids, sugar and vitamins are absorbed.

    Presence of lacteals in the villi for the absorption of fatty acids and glycerol.

    1. The following is a dental formula of a certain mammal.

    I0/3 C0/1 Pm3/3 m3/3

    1. Calculate the total number of teeth of the mammal. (2mks)

    0 + 0 + 3 + 3 x 2 = 12

    3 + 1 + 3 + 3 x 2 = 20

                                   32 teeth

    1. Give the likely mode of feeding. (1mk)

    Herbivorous

    • Give a reason for your answer in (ii) above. (1mk)

    It lacks incisors and canines in the upper jaw to create a horny pad.

    1. Name the disease in humans caused by deficiency the following: (5mks)
    2. Vitamin A

    Night blindness

    1. Vitamin D

    Rickets

    • Vitamin C

    Scurvy

    1. Iodine

    Goiter

    1. Iron

    Anemia

    1. State one function of water in the diet. (1mk)

    it is a solvent of soluble food substances cooling of the body.

    Provided the medium for transport of dissolved food substances.

    Facilitates hydrolysis of food substances.

    1. State five factors that determine energy requirements in human beings. (5mks)

    Basal metabolic rate

    Occupation/everyday activity

    Age

    Body size

    Sex

    biology form 2 exams biology form 2 pdf biology form 2 questions and answers pdf form 2 biology notes pdf form 2 biology questions and answers form 2 revision papers term 1 pdf download form 2 revision papers with answers pdf download form 2 term 1 opener exams
    Maverick John

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