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6. Describe the neck of a sperm.
- Contains nucleus of sperm.
- Main site of respiration, allowing the sperm to swim.
- Contains mitochondria providing energy for sperm movements.
- Contains protein filaments providing energy for sperm.
7. What does the placenta do?
- Grows the umbilical chord, providing the embryo with nutrients.
- Connects the embryo's heart with the mothers, keeping beating regular.
- Takes nutrients and O2 in, and takes waste and CO2 out.
- Takes waste and CO2 in, and takes nutrients and O2 out.
8. Describe the achromosome of a sperm.
- Membranous sac containing enzymes that destroy outer egg surface.
- Replacement for sperms nucleus- single chromosome, coding for DNA.
- Made of protein filaments which break through outer egg surface.
- Contains mitochondria providing energy for sperm movements.
9. What does the iris do?
- Transparent, slightly refracts light.
- Protective layer to eye.
- Controls the amount of light entering the eye.
- Refracts light causing it to fall onto the fovea.
10. Which of these is NOT an advantage of fish farming?
- Diets controlled
- Pesticides control parasites
- Cheap source of protein
- Selective breeding
- Demand easily reached
- Genetic modification
- Water quality easily controlled
- Fish protected from predators
11. How does nervous communication travel around the body and why is it different to endocrine?
- Nervous communication is nerve impulses, endocrine is hormones in the blood stream.
- Nervous communication is hormones in the blood stream, endocrine is nerve impulses.
- Nervous communication in through the bloodstream, and endocrine is muscle tensions.
- Nervous communication is nerve impulses, and it is the same as endocrine.
12. What do lymphocytes do?
- Produce anti-bodies destroying harmful micro-organisms.
- Build up the retina of the eye.
- Engulf infecting bacteria.
- Produce phagocytes.
13. What is recombinant DNA?
- DNA that has been taken out of one species and inserted into another.
- DNA from the nucleus of the surrogate mother of a cloned animal.
- DNA that "sticks" together two pieces of new DNA.
- Gene DNA that codes for a specific characteristic.
14. Which of these is NOT a quality produced by selective breeding?
- Resistance to certain diseases
- Better balance of nutrients
- Immunity to certain diseases
- Hardiness
- Resistance to pest damage
15. Which of these is NOT a use of genetically modified bacteria?
- Human growth hormone
- Bovine somatotropin
- Enzymes for alcoholic drinks
- Enzymes for washing powders
- Enzymes for food industry
- Making insulin
16. What are the differences in effects and responses of nervous and endocrine communication?
- Nervous = slower effect and short response, Endocrine = instant effect and short response.
- Nervous = instant effect and short response, Endocrine = slower effect an long lasting response.
- Nervous = instant effect and long lasting response, Endocrine = slower effect and short response.
- Nervous = slower effect and long lasting response, Endocrine = instant effect and short response.
17. What does the optic nerve do?
- Controls the human effector causing us to blink.
- Connects the eye to the brain.
- Traduces light energy into electrical energy using rods and cones.
- Gives the clearest image.
18. How does vaccination prevent future diseases?
- Manufacture of more red blood cells, carrying oxygen to muscles to fight micro-organisms.
- Manufacture of memory cells. The memory lymphocytes can produce antibodies faster and in greater quantities.
- Gives body experience with disease, meaning lymphocytes remember the antibodies needed to destroy it.
- Greater manufacture of lymphocytes and phagocytes, allowing a quicker destruction of bacteria
19. What is the greenhouse effect?
- Some long wave radiation from the sun is absorbed by greenhouse gases and emitted back onto earth.
- Radiation by the sun is absorbed by the greenhouse gases and does not emit back onto earth properly.
- Some short wave radiation from the sun is absorbed by greenhouse gases and emitted back onto earth.
- The ozone layer is destroyed by the toxic greenhouse gases.
20. What is a reflex arc?
- Stimulus, receptor, motor neuron, CNS (sensory neuron), relay neuron, effector, response
- Stimulus, receptor, relay neuron, CNS (motor neuron), sensory neuron, effector, response.
- Stimulus, receptor, sensory neuron, CNS (relay neuron), motor neuron, effector, response
- Stimulus, receptor, motor neuron, CNS (relay neuron), sensory neuron, effector, response