Chapter 5: Reproduction and growth

Question 1

Animals have various ways to attract mates.
Give some examples

Answer 1

1. Peacock: showing beautiful feathers
2. cicada: making loud sounds
3. red-crowned crane: dancing

Question 2

ways of reproduction

Answer 2

Reproduction by giving birth to young
Reproduction by laying eggs

Question 3

Reproduction by giving birth to young

Answer 3

After matting (交配), a male’s sperm cell (精子細胞) fertilises a female’s eggs (卵子). the fertilised egg (受精卵) develops into an embryo (胚胎) and then a foetus (胎兒) inside the mother’s body. It gets nutrients (營養) from the mother’s body. When the foetus is fully developed into a baby, the mother gives birth.

Question 4

Reproduction by laying eggs

Answer 4

Their fertilised eggs (受精卵) develop outside the mother’s body. The embryos (胚胎) develop by getting nutrients (營養) from the eggs. When the embryos are fully developed, the young hatch (孵化) from the eggs.

Question 5

In general, animals change in _________ as they grow.

Answer 5

size

Question 6

Some animals change their _____________ completely as they grow

Answer 6

appearance

Question 7

The life cycle of animals

Answer 7

1. birth
2. growth
3. ageing
4. death

Question 8

Animals ________ to carry on their own kind.

Answer 8

reproduce

Question 9

How do some animals take care of their young?

Answer 9

1. feed them
2. protect them
3. teach them

Question 10

Give some examples of animals taking care of the young

Answer 10

1. A mother birds feeds its young
2. A mother elephant teaches its young to cross rivers
3. A mother kangaroo keeps her baby in her pouch until it can live on its own.