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Form 4 Term 1 2023 Biology Paper 1 Exam Set 9 [PDF]

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Question 1

Name the tissues whose cells are thickened with:
  1. Cellulose and pectin
  2. Lignin
Answer
  1. Collenchyma
  2. Sclerenchyma
Question 2.

The diagram below represents a fern.
  1. Name Parts labeled A and B
    • A
    • B
  2. To which division does the plant belong?
Answer
    • A - Sori
    • B - Rhizome
  1. Pteridophyta
Question 3

State three measures that can be taken to control infection of man by protozoan parasites.
Answer
- Improving sanitation/hygiene
- Using insecticides to kill vectors
- Avoiding indiscriminate sexual intercourse
- Clearing bushes/tall grass around the house
Question 4

Explain how the following factors hinder self pollination in plants
  1. Protogyny
  2. Dioecism
Answer
  1. Protogyny - Stigma matures earlier and is ready to receive pollen grains before the anthers are ready
  2. Dioecism - Male and female gametes occur in separate plants.
Question 5

Explain the likely effect on humans and other organisms of untreated sewage discharged into water body that supplies water for domestic use.
Answer
Contains disease – causing micro-organisms which may cause outbreak of water borne diseases; faecal material is broken down by saprophytes leading to depletion of dissolved oxygen thus suffocation of aquatic organisms; breakdown of matter releases nutrients which enrich the water resulting in eutrophication.
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- Form 4 Term 1 2023 Biology Paper 1 Exam Set 9 [PDF]