biology mock mistakes

Question 1

how does carbon dioxide enter a plant

Answer 1

by diffusion

Question 2

give two uses of glucose in a plant

Answer 2

respiration and storage, celulose, amino acids, fats, oil

Question 3

descibe two changes that tale place in the breathing system when breathing in

Answer 3

the lungs expand and the diaphragm flatnes

Question 4

give two conditions that are automatically controlled in your body

Answer 4

• temperature
  -blood glucose
  -oxygen and carbon dioxide levels

Question 5

whats the name of the group of cells that controls the natural resting heart rate

Answer 5

pacemaker

Question 6

explain how a slime mould uses phagocytosis and enxymes to obtain nutrients from particles of food

Answer 6

• ingests food, enzymes break down large insoluble molecules into small soluble molecules so small so that they can be absourbed

Question 7

two spore cells fuse to form a zygote:
explain why the zygote is not genetically identical to the origianl slime mould cells

Question 8

give two differnces in the location of genes in a bacterial cell compared to in an animal cell

Answer 8

• its not in the nucleus
• in some cells dna can be found in plasmids

Question 9

two strands of DNA form a twisted spiral structure. Whats the scientific term

Answer 9

• double helix

Question 10

what’s the order for reflex actions

Answer 10

• stimulus
• receptor
  -sensory neurone
• coordinator
• motor neurone
  -effector
• response

Question 11

describe how the nerve umpulse is transferred across a synapse to continue in the second neurone

Answer 11

as a chemical whoch moves across the synpae and causes an impulse

Question 12

what are extremophiles

Answer 12

extremophiles are animals adapted to resist extreme temperatures

Question 13

explain the steps which take place to form a clot over the cut

Answer 13

platelets stitch to the wound site starting a series of enzyme controlled reactions which results in fibrinogen changing into fibrin forming a network of fibres which trap the blood cells forming a scab

Question 14

describe four features of the small intestine increase the efficiency of absorption

Answer 14

1-villi increase surface area which leads to greater diffusion
2- which provides shorter diffusion pat
3-a large cappilary network which increases concentration gradient
4-has many mitochondria to release energy for active transport