Bio Q I Got Wrong

Question 1

Give one reason why the total biomass of the daphnia is lower than the total biomass of the algae

Answer 1

non-digestible parts (of
algae) or lost in faeces
• not all absorbed
• lost in urine / urea
• used in respiration or lost
as carbon dioxide / CO2
• algae not all eaten or eaten by other organisms
• some algae decompose

Question 2

Why does a fertiliser present cause an increase in the pop of the primary consumer

Answer 2

increased (growth / reproduction of) algae

(more algae so) more food for Daphnia

Question 3

Why will the secondary consumer pop decrease when too much fertiliser is added

Answer 3

Hydra have) less food

because (graph shows) fewer Daphnia (with more fertilis

Question 4

Which structure in the ucleus of a human cell contains dna

Answer 4

Chromosome

Question 5

Two benefits of understading the human genome

Answer 5

diagnosis of inherited / genetic disorder
• gene therapy or treatment of inherited disorders
• understanding (human) evolution
or
understanding ethnic origins (of a person)
or
understanding ancestry
• tracing human migration patterns

Question 6

Explain how phototropism in a plant shoot helps the plant to survive

Answer 6

leaves / plant receive(s) / absorb(s) more light
(so) more photosynthesis
(so plant) produces more glucose

Question 7

Plant cloning why- several groups of cells are scraped off the leaf

Answer 7

so many / several plants can be produced

Question 8

Plant cloning why- nutrients are added to the agar jelly

Answer 8

for making protein / amino acids or for making chlorophyll

or for providing energy or for respiration

Question 9

Plant cloning why-hormones are added to the agar jelly

Answer 9

so differentiation occurs

or so roots / shoots develop

Question 10

Plant cloning why- the plant cells are kept in sterile conditions

Answer 10

to prevent growth / entry of microorganisms / named type or prevent decay / disease

Question 11

Plant cloning why- plant cells are kept at 20 C

Answer 11

So optimum/good growth

Question 12

Explain why plant cloning only produces one type of flower colour

Answer 12

all new plants have been) produced by asexual reproduction / mitosis or produced without (fusion of) gametes
(so) all are genetically identical /clones

Question 13

Explain how the pituitary and kidneys reduce water loss

Answer 13

high(er) concentration of blood causes (more) ADH / hormone release
(and hormone / ADH causes) increased permeability of kidney tubules (to water)
(so) increased water reabsorption

Question 14

Explain two biological reasons why most doctors think that a kidney transplant is a better method of treatment than dialysis

Answer 14

changes in concentrations / levels of substances / urea are minimised
(so) less / no chance of causing damage to body cells / tissues

not repeatedly puncturing skin or blood not in contact with machine
(so) less / no chance of infection or less / no chance of blood clots
or no need to take anti-clotting drugs

Question 15

Why did the rate of reproduction of acteria increase between 2h and 7h?

Answer 15

more bacteria so more divisions / reproduction (per unit time)

Question 16

Suggest three ways the scientist could maintain a high rate of reproduction in the bacterial culture

Answer 16

add (more) sugar
• add (more) amino acids / protein
• add (more) oxygen
• increase temperature
• remove toxins / waste or maintain pH
• stir the culture

Question 17

What is a herbicide

Answer 17

Kills weeds

Question 18

Explain the advantage of making crop pllants resistant to glyphosate (a herbicide)

Answer 18

can use the glyphosate / weed killer to kill weeds but not kill / affect crop

(so) less competition for light / water / minerals / ions
(so) crops have high(er) yield

Question 19

The body cells of a person with type 2 diabetes do not respond to insulin. A person with type 2 diabetes often has a higher blood insulin conc than a non diabetic person- explain why

Answer 19

cells / liver / muscles absorb less glucose
(so) glucose concentration in blood remains high
(high blood glucose stimulates / causes) pancreas to release more insulin