1. What does the iris do?
- Controls the amount of light entering the eye.
- Refracts light causing it to fall onto the fovea.
- Transparent, slightly refracts light.
- Protective layer to eye.
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Other questions in this quiz
2. How does vaccination prevent future diseases?
- Manufacture of memory cells. The memory lymphocytes can produce antibodies faster and in greater quantities.
- Greater manufacture of lymphocytes and phagocytes, allowing a quicker destruction of bacteria
- Gives body experience with disease, meaning lymphocytes remember the antibodies needed to destroy it.
- Manufacture of more red blood cells, carrying oxygen to muscles to fight micro-organisms.
3. Which of these is NOT a quality produced by selective breeding?
- Better balance of nutrients
- Immunity to certain diseases
- Resistance to pest damage
- Resistance to certain diseases
4. How can a runner produce asexually?
- Pollen is transferred from the male anther to the female stigma by wind or insects.
- Seed tips are removed and placed in a solution encouraging root growth and growing into new plants.
- As the plant grows, some part breaks away and touches the ground, growing into a new plant.
- Seeds are dispersed by wind, water, or animals.
5. What does the hormone insulin do?
- Stimulates the liver to become less permeable to glucose, increasing the concentration of urine.
- Stimulates the liver cells to take up glucose and convert it into glycogen, lowering the blood levels of glucose.
- Stimulates the liver to become more permeable to glucose, decreasing the concentration of it in urine.
- Stimulates the liver cells to take up glycogen and convert it into glucose, increasing the concentration of the blood.