Share Revision biology year 8
Save to Folder
Name one type of sex cell in humans
Egg or sperm
Arrange from smallest to largest: [Organ, Tissue, Body System, Cell]
Cell, tissue, organ, organ system
Where is DNA located?
In the nucleus
I am a stretchy organ. I mix food with acid to help break it down. What am I?
Stomach
What would most likely happen if a primary consumer was removed from a food web?
The population of producers would increase due to reduced grazing, and secondary consumers might decline due to lack of food.
Why are food webs more stable than food chains?
Because they provide multiple pathways for energy flow; if one species is removed, others can fill its role.
What does each parent contribute to their offspring during fertilisation? A) A complete set of chromosomes B) One chromosome C) Half the genetic material D) Only dominant genes
C) Half the genetic material
What is a gene? (Short answer)
Answer: A section of DNA that codes for a particular characteristic.
Explain why giraffes with longer necks had a better chance to survive and reproduce.
Answer: They could reach food higher in trees, giving them a better chance of survival and reproduction.
What is the main function of alveoli in the lungs?
C) Exchange gases
Explain how oxygen enters the bloodstream from the lungs.
Oxygen diffuses from the alveoli into the capillaries due to a concentration gradient.
What is the role of bile in digestion?
Breaks down lipids into fatty acids
Which blood component is responsible for carrying oxygen?
Red blood cells
Which structure in a flower produces pollen?
Anther
What happens to the ovule after fertilisation?
It becomes a seed
What is are chloroplasts, where are they normally found and what gives them their colour?
Plant organelles where photosynthesis takes place. They are green because they contain chlorophyll. They are normally found in leaves and stems.
