Eggs


The egg carries everything the new animal needs to grow inside it. But the egg also needs warmth. A fertilised bird’s egg will hatch into a chick only if it is kept warm. The mother and father penguin sit on the egg for nine weeks. Crocodiles keep their eggs warm by burying their eggs under soil and rotting leaves.


crocodile egg


Activity 4 Look at hatching eggs Group work


Look at the pictures of the eggs in Figure 5 and answer the following questions. Write one sentence for each. 1 Describe how the penguin egg is kept warm. 2 Describe how the crocodile egg is kept warm. 3 Explain what happens when penguin eggs and crocodile eggs are not kept warm.


Dry yeast


If you add warm water and a bit of sugar to active dried yeast, it begins to foam. The yeast makes bubbles of gas as it feeds on the sugar.


Activity 5 Grow yeast


Group work Try growing your own yeast. Watch how your teacher does it, then follow the pictures in Figure 6 below. The water must be lukewarm. Do not make the water too hot or it will kill the yeast.


penguin egg


Figure 5 There is life inside these eggs.


Figure 6 Dry yeast needs just a teaspoon of sugar in half a cup of warm water to grow.


Unit 1: Living and non-living things: Living things


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