Page 48 - ScienceStd4

Activity 4: Investigating the stages of mosquito development

Materials: Hand lens, a bottle or coconut shell, fine mesh net
FOR ONLINE READING ONLY
Procedure

1. Collect water from a stagnant pool that has been there

for a long time. Make sure the water has mosquito eggs
or larvae.

2. Place some mosquito eggs or larvae from the water into
a bottle or coconut shell.

3. After two days use a hand lens to observe water for
changes of eggs into larvae.

4. Cover the bottle or coconut shell containing water with

larvae with a fine mesh net. Make sure it is securely
closed.

Questions
(a) What did you observe during your investigation?

(b) Draw a diagram of mosquito development stages.

Life cycle of a cockroach

Activity 5

Observe the stages of cockroach development in their natural

environment. Share your observations with your classmates
for discussion.

Cockroaches lay eggs in a hard casing. They hide their eggs in
places that cannot be easily seen. The eggs hatch into nymphs

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