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Define the term mutation Is a sudden change in the genetic make up of an individual A couple, George and Grace had a son who was suffering from haemophilia even though none of themshowed signs of haemophilia.i) State the genotype of George and Grace. Using a genetic cross work out the genotype of the couple’s […]
- Explain how an upright position is maintained in herbaceous plants
Explain how an upright position is maintained in herbaceous plants Plant cells have a cellulose cell wall; which is rigid; plants absorb water through osmosis and cells become turgid; which makes the tissues firm and erect; Collenchyma cells have thickened cell walls; to give strength; Xylem vessels have thick and lignified walls; that strengthen plants. […]
- Describe how xerophytes are adapted to living in their habitat
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- Describe how a mammalian heart is adapted for its function
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- Name the causative agents of the following diseases in humans
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- Give the meaning of the term binomial nomenclature
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- What is meant by the term allele?
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- State the functions of ribosomes and Golgi apparatus
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- A set up that was used to investigate a certain process in plants as shown in the diagram below.
a) What process was being investigated? (Rate of) transpiration b) i) State two precautions that should be taken when setting up the experiment. Cut shoot under water Apply petroleum jelly to cork-glass/Bung-glass/Bung-shoot connection Open reservoir tap ii) Give a reason for each precaution stated in b(i) above. To ensure no air enters leafy shoot/xylem To […]
- State how the following structures of the skin are adapted to their functions;
State how the following structures of the skin are adapted to their functions; i) Malphigian layer has actively dividing cells that give rise to new epidermal cells Epidermal cells contain Melanin that protects /prevents the skin against ultraviolet rays/UV light ii) Sebaceous glands Secrete sebum, an antiseptic/water repellent substance/prevent drying/cracking of skin/makes skin supple Post […]
- A certain animal has no incisors, no canines, 6 premolars and 6 molars in its upper jaw. It has 6 incisors, 2 canines, 6 premolars and 6 molars on the lower jaw. Write its dental formula
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