Bio unit 4 exam prep game

OP

that was a perfect answer lol. i think i even learned something there.... no prepare to see how i fale at biology....

Reply 3

OP

Original post by SarahP~

This is the Calvin Cycle. RuBP, a 5 carbon molecule, combines with CO2 to make 2 molecules of GP (3 carbon molecules). GP is reduced to TP. This uses reduced NADPH and ATP from the light-dependent stage. 1/6 of the TP formed is converted to organic molecules, e.g. glucose for use as respiratory substrate. 5/6 uses ATP from the light-dependent stage to reform RuBP.

Describe the advantages and disadvantages of using biological agents to control pests (5 marks)

The advantages of using biological agents to control pests are that they are cheaper to source than chemical agents beacause they must only be bought once. Another andvantage is that they have little or no side effects to other animals, so are more selective. They are better than chemical agents beacause you do not get run off causing eutophication neither.
the disadvantages are that if they are not sourced locally they may become a pest themselfves by eating animals that are wantet within the ecosystem and therefore they may reduce biodeversity. another disadvantage is that they dont always take immediate effect.

ok i dont think that was 5 marks... but how did i do? (ill think of a qeustion....)

Reply 4

Original post by SarahP~

This is the Calvin Cycle. RuBP, a 5 carbon molecule, combines with CO2 to make 2 molecules of GP (3 carbon molecules). GP is reduced to TP. This uses reduced NADPH and ATP from the light-dependent stage. 1/6 of the TP formed is converted to organic molecules, e.g. glucose for use as respiratory substrate. 5/6 uses ATP from the light-dependent stage to reform RuBP.

Describe the advantages and disadvantages of using biological agents to control pests (5 marks)

Advantages - the only need to be introduced once as they reproduce.
- one off payment as they dont need to be reintroduced like pesticide.
- they are very specific and only get rid of the chosen pest if done correctly

Disadvantages - they may become pests themselves
- may mess up the ecosystem and lead to biodiversity being reduced

What are the advantages of intensive farming? 3 marks

(edited 12 years ago)

Reply 5

Original post by chill543

The advantages of using biological agents to control pests are that they are cheaper to source than chemical agents beacause they must only be bought once. Another andvantage is that they have little or no side effects to other animals, so are more selective. They are better than chemical agents beacause you do not get run off causing eutophication neither.
the disadvantages are that if they are not sourced locally they may become a pest themselfves by eating animals that are wantet within the ecosystem and therefore they may reduce biodeversity. another disadvantage is that they dont always take immediate effect.

ok i dont think that was 5 marks... but how did i do? (ill think of a qeustion....)

Beat me to it! -_-

We got exactly the same point haaha :smile:

Reply 6

SarahP~

Original post by chill543

The advantages of using biological agents to control pests are that they are cheaper to source than chemical agents beacause they must only be bought once. Another andvantage is that they have little or no side effects to other animals, so are more selective. They are better than chemical agents beacause you do not get run off causing eutophication neither.
the disadvantages are that if they are not sourced locally they may become a pest themselfves by eating animals that are wantet within the ecosystem and therefore they may reduce biodeversity. another disadvantage is that they dont always take immediate effect.

ok i dont think that was 5 marks... but how did i do? (ill think of a qeustion....)

4/5

The mark scheme says:
Specific
Only needs 1 application/reproduces
Keeps/maintains low population
No resistance
No bioaccumulation
Can be used in organic farming
Doesn't completely eradicate pest
May become a pest itself
Slow acting

I've bolded the things you said :smile:

Reply 7

OP

hmm i think i see were i loose marks now lol... just from that....

Increased food production within a smaller area. so better use of land.
more energy is transfered throught trophic levels.
makes it a cheaper for the consumer (humans).

Q. What is the Hardy Wineberg Princible (3 marks)

Reply 8

OP

whey, this is getting kind of fun already!

Reply 9

SarahP~

Original post by eemooz

What are the advantages of intensive farming? 3 marks

The temperature is higher so less energy is lost in maintaining a high body temperature in birds/mammals. The diet can be controlled to maximise absorption, by using a diet high in protein, so less energy is lost as waste and more is used in tissues and therefore available to the next comsumer. Antibiotics can be added to the feed to reduce the risk of disease, so the organisms have higher survival chances, and to reduce the cost as antibiotics in the feed cost less than a vet would.

How does speciation occur? (5 marks)

Reply 10

OP

looks like i need to revise speciation....

Reply 11

Original post by chill543

hmm i think i see were i loose marks now lol... just from that....

Increased food production within a smaller area. so better use of land.
more energy is transfered throught trophic levels.
makes it a cheaper for the consumer (humans).

Q. What is the Hardy Wineberg Princible (3 marks)

Original post by SarahP~

The temperature is higher so less energy is lost in maintaining a high body temperature in birds/mammals. The diet can be controlled to maximise absorption, by using a diet high in protein, so less energy is lost as waste and more is used in tissues and therefore available to the next comsumer. Antibiotics can be added to the feed to reduce the risk of disease, so the organisms have higher survival chances, and to reduce the cost as antibiotics in the feed cost less than a vet would.

How does speciation occur? (5 marks)

you've both said what the other hasn't :tongue:

but it was only three marks so full marks! :biggrin:

I need to revise speciation -_-

is this aqa...?

OP

Original post by SarahP~

The temperature is higher so less energy is lost in maintaining a high body temperature in birds/mammals. The diet can be controlled to maximise absorption, by using a diet high in protein, so less energy is lost as waste and more is used in tissues and therefore available to the next comsumer. Antibiotics can be added to the feed to reduce the risk of disease, so the organisms have higher survival chances, and to reduce the cost as antibiotics in the feed cost less than a vet would.

How does speciation occur? (5 marks)

ok i got scared about its name but now i remeber what it truelly is.

- a single species inhabits one area.
- area is split by geagraphical isolation (be it lava flow of water drying up)
- diffrent climate conditions arise in the areas (e.g temp)
-alles are naturally selected for these new condition
- after hundreds of years gene pool is now diffrent
- the animals are no longer able to interbreed

How did i do??

Q. what is the hardy wineberg princible ( 3 marks)

Reply 14

OP

Original post by rf229

is this aqa...?

erm well im doing AQA, i dont know about the others?

Reply 15

Original post by rf229

is this aqa...?

I believe so. :smile:

Reply 16

orange.bananna

9

Original post by chill543

Q. what is the hardy wineberg princible ( 3 marks)

Allele frequency within a population stays the same from generation to generation.
Equation to work out allele frequency is
p^2 + 2pq + q^2 = 1
and there are 5 assumptions to be made in order to use the equation:
-population is large
-there is no movement of organisms
-random mating occurs
-no gene mutation
-all genotypes have the same reproductive success

What is glycolysis and where in the cell does it take place? (3 marks)

Reply 17