Question 1
State the characteristics of living organisms exhibited by the following
a) A mango tree producing flowers.
b) A man sneezing.
Answer
a) Growth and development
b) Irritability
b) Irritability
Question 2
Form one students went to collect tiny ants from a tree trunk. State the most suitable instrument to use.
Answer
A potter
Pit fall trap.
Pit fall trap.
Question 3
Calculate the magnification if the actual length of an ant was 5mm and the drawing length was 2cm. Show your working.
Answer
Question 4
The diagram below represents a plant cell
- Identify the part labeled S
- State two functions of the part labeled R
- Name one cell organelle present in a plant cell and absent in an animal cell
Answer
- S - cell wall
- 1. Stores salts and sugars for the cell
2. Controls the osmotic properties of the cells. - Chloroplast
Question 5
The diagram below shows a set-up for an experiment to demonstrate a certain physiological process.
a) What nature of solution is represented in 20% sugar solution.
b) Explain the observation made on the set-up after one hour.
Answer
a) Hypertonic solution ; highly concentrated solution
b) The amount of solution in thistle funnel increased/rose and amount of distilled water decreased this is because water molecules from the beaker moved into cellophane membrane through osmosis.
b) The amount of solution in thistle funnel increased/rose and amount of distilled water decreased this is because water molecules from the beaker moved into cellophane membrane through osmosis.