7Ba/1
Sexual reproduction
Name
7
B
a
?
Class
1 The pictures below show some adult animals and their young. Adult animals
which have reproduced are called parents and their young are called offspring.
a On the line below each animal, say whether it is a parent or offspring.
b Draw lines between the pictures to show which parents have which offspring.
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7Ba/1
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Sexual reproduction (continued)
2 Choose words from the brackets to complete these sentences.
For animals to produce offspring
pollination) must happen. In this process two
sex) cells join together. The male cell is called the
(egg/sperm) cell and the female cell is called the
sperm) cell. The joining of these cells makes a
(fertilised/pollinated) egg cell.
(fertilisation/
(body/
(egg/
3 Female frogs produce up to 20 000 egg cells at a time. If all of these were
fertilised, they would produce many thousands of tadpoles. Most female
cats, however, only produce four egg cells at a time.
a How many kittens does a female cat normally give birth to at a time?
b How many babies does a human woman normally give birth to
at a time?
c How many egg cells do you think a human woman produces
at a time?
d Look at the pictures in question 1. Apart from frogs, name one other
animal that you think produces thousands of egg cells at a time.
e Why do you think some animals produce so many egg cells at a time?
Tick the correct answer.
So more egg cells are likely to survive.
To provide food for other hungry animals.
So less egg cells get eaten.
So the egg cells can be easily spotted.
S
knowledge, literacy
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