2010 年
生物 · 共 60 題 · 點擊選項即時核對答案
Nutrients for the development of the human embryo in the first three days come from
The following photograph shows the cross-section of the umbilical cord.
Which of the following combinations correctly states the difference between the contents of blood vessels X and Y?
| X | Y | |
|---|---|---|
| more nutrients | fewer nutrients | |
| more oxygen | less oxygen | |
| more carbon dioxide | less carbon dioxide | |
| more red blood cells | fewer red blood cells |
Which of the following statements about the placenta is incorrect?
What will be the effect of tying and cutting both sperm ducts in a man?
The length of wings of a fruitfly is controlled by a pair of alleles. A fruitfly homozygous for long wings was crossed with a fruitfly with short wings and all their offspring had long wings. The offspring were then allowed to interbreed. Which of the following statements about the F₂ generation are correct?
Which of the following human characteristics shows discontinuous variation?
The diagram below shows a set-up used to investigate the photosynthesis of a water plant.
The rate of bubble formation from the water plant may decrease when
The set-up below was placed in a well-illuminated area for 24 hours.
Which of the following correctly states the colour of the hydrogencarbonate indicator in the three boiling tubes at the end of the investigation?
| Tube P | Tube Q | Tube R | |
|---|---|---|---|
| purple | red | yellow | |
| purple | yellow | red | |
| yellow | purple | red | |
| yellow | red | purple |
The following photomicrographs show the change in size of a stoma of a plant in daytime and at night.
The importance of this change to the plant is to reduce
Which of the following processes is carried out by symbiotic bacteria inside the root nodules of a bean plant?