Questions I Got Wrong

Question 1

Suggest why fewer seeds germinate when they are stored in wet and warm conditions

Answer 1

• because more bacteria is in warm and wet conditions so they will kill the seeds

Question 2

What happens to the structures in the ovaries after fertilisation

Answer 2

• ovule becomes a seed
• ovule wall becomes a seed coat
• ovary becomes a fruit

Question 3

What happens to bacteria after they have been ingested by phagocytes

Answer 3

• they are absorbed by the phagocytes
• digestive enzymes are released within the phagocyte
• the enzymes kill the bacteria by digesting it

Question 4

Explain the role of lymphocytes in the immune response

Answer 4

• detect antigens
• produces antibodies that bind to the antigens
• makes it easier for phagocytes to find the pathogen
• makes the pathogens stick together to make it easier for phagocytes to digests many pathogens

Question 5

How do palisade cells help the learn to photosynthesise

Answer 5

• at the top of the cell to absorb lots of sunlight
• have loads of chloroplasts which help absorb lots of sunlight
• They are densely packed which helps them absorb sunlight

Question 6

How does the spongy mesophyll help the leaf photosynthesise

Answer 6

• located near the stomata to absorb CO2. Has many galopes for diffusion and gas exchange

Question 7

Heterozygous meaning

Answer 7

Different alleles

Question 8

Homozygous meaning

Answer 8

Same alleles

Question 9

What happens to glucose in the blood after eating

Answer 9

Glucose is absorbed from the blood. Insulin turns glucose into glycogen to be stored. Lower glucose in hepatic vein which is leaving the liver.

After 5 hours, less food in the gut, insulin is not created, glycogen turns into glucose, glucose is released from the liver into the blood

Question 10

Role of bile in digestion

Answer 10

• neutralises acid in the stomach
• Optimum PH for digestive enzymes
• increases surface area for digestion
• emulsifies fats

Question 11

Why do some farmers limit the amount of chemical fertiliser they use

Answer 11

• reduces water potential in the soil
• prevents water uptake into plants
• leads to algal bloom
• causes loss of aquatic life
• prefer to use natural fertiliser such as manure
• organic crops earn more money

Question 12

Role of magnesium in plants

Answer 12

Necessary to conduct photosynthesis

Question 13

Role of fibre

Answer 13

• fibres are involved in peristalsis which helps food move down the small intestine

Question 14

Differences between eukaryotes and prokaryotes

Answer 14

• eukaryotes have a nucleus, prokaryotes have a nucleoid
• eukaryotes have organelles such as mitochondria and chloroplasts
• eukaryotes have chromosomes whereas prokaryotes have circular chromosomes
• eukaryotes lack plasmids

Question 15

Why does lactic acid build up in muscles

Answer 15

• when there isn’t enough oxygen for the muscles to respire, anaerobic respiration has to take place to provide energy for the muscles
• lactic acid is a byproduct of anaerobic respiration