Reproduction and genetics, Year 7: more practice：全部卡片
整套按顺序列出——孩子看到之前，您可以先通读一遍。
- The main male sex hormone, made in the testes, is ____.
testosterone
提示It begins with "testo-", like the organ that makes it.
为什么Testosterone causes a boy's voice to deepen, his body hair to grow and his testes to start making sperm.
- Name the main female sex hormone, made in the ovaries, that causes breasts to develop and periods to start.
Oestrogen
提示It begins with "oe-".
为什么Oestrogen also helps control the menstrual cycle once periods have begun.
- During puberty there is a short, fast burst of increase in height. What is it called?
A growth spurt
提示Think of a sudden short burst of speed.
为什么Growth spurts happen at different ages for different people, so friends can differ a lot in height for a while.
- Hormones in puberty can make feelings change quickly, from happy to upset and back again. What is this called?
Mood swings
提示Feelings that rise and fall like a playground ride.
为什么Mood swings are a normal emotional change in puberty. Talking to someone you trust can help.
- The sticky top of a flower's female part, where pollen must land
The stigma
提示Pollen has to stick here for the next stage to happen.
为什么The stigma sits at the top of the style. Its sticky surface catches pollen grains.
- In a flower, the stamen and the carpel are the two reproductive parts. Which one is the female part?
The carpel
提示The stamen has the anther. The female part holds the ovary.
为什么The carpel is made of the stigma, the style and the ovary. The stamen is made of the anther and its filament.
- Inside the ovary of a flower are small structures that each contain a female gamete and can become a seed after fertilisation. What are they called?
Ovules
提示Each one can become a seed after fertilisation.
为什么An ovule contains the female gamete. After fertilisation the ovule grows into a seed.
- Why is a life cycle drawn as a circle, not a straight line?
The offspring grow up and reproduce, so the cycle starts again
提示What does the new generation do when it grows up?
为什么Each generation produces the next, so the stages repeat over and over.
- In a butterfly's life cycle, which stage comes between the caterpillar and the adult?
The pupa (chrysalis)
提示The caterpillar stays still inside a case while its body is rebuilt.
为什么The order is egg, caterpillar (larva), pupa, adult butterfly.
- A young frog lives in water, breathes with gills and has a tail but no legs at first. What is this stage called?
A tadpole
提示It hatches from frogspawn.
为什么The order is egg (spawn), tadpole, young frog, adult frog. The tadpole grows legs and lungs as it changes.
1★ KS3-BIOL-REP-0047
2★ KS3-BIOL-REP-0048
3★ KS3-BIOL-REP-0049
4★ KS3-BIOL-REP-0050
5★ KS3-BIOL-REP-0051
6★ KS3-BIOL-REP-0052
7★ KS3-BIOL-REP-0053
8★ KS3-BIOL-REP-0054
9★ KS3-BIOL-REP-0055
10★ KS3-BIOL-REP-0056