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Activity 1Mixed-up meanings

Pupils should try to fill in the blanks in the final column with the words that match the meanings. The words needed are listed, randomly mixed, in the first column.

This exercise should not be tackled in isolation, but by a reader with access to the story itself: The contexts in which words are used provide powerful clues to their meanings.  

Word

Meaning

Word should be

1

defining

watery liquid that surrounds an embryo. It is contained in a thin, tough sac called the amnion.

2

flexibility

kept in reserve in case it’s needed

3

guidance

the building block of all living things except viruses

4

potential

fertilisation of egg by sperm

5

DNA

something that makes it what it is

6

endoderm

of a disease: in which the body or mind works less and less well, as time goes on

7

mesoderm

grow bigger and better formed

8

placenta

illness, often caused by something going wrong, rather than infection

9

resource

giant molecule that contains the genes; short for deoxyribonucleic acid

10

transplant

the outermost of the three layers of an embryo, which grows into the skin and nervous system

11

embryonic

early stage in development of an animal or plant following fertilisation of an egg cell. In humans the word is used for the fertilised egg during its first seven weeks of existence; from the eighth week on it is called a foetus.

12

tissue

of the embryo

13

expelled

the innermost of the three layers

real   science

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