Biology paper 2

Question 1

State the stages of meiosis

Answer 1

Organelles and chromosomes replicates.
They move to the other end of the cell.
cell divides.
Copies separate and the second division takes place.
Four haploid cells (gametes) each with half the number of chromosomes of the parent cell.

Question 2

what happens when blood glucose concentration is to low?

Answer 2

pancreas releases glucagon which stimulates the glycogen to be converted into glucose and releases

Question 3

Type 1 diabetes?

Answer 3

when somebody produces little to no insulin.

Question 4

Type 2 diabetes?

Answer 4

when someone is resistant to their own insulin

Question 5

what hormone is released at the beginning of the menstrual cycle.

Answer 5

FSH

Question 6

what happens during day 14 to day 28 of the menstrual cycle

Answer 6

lining of the uterus is maintained

Question 7

name every hormone involved in the menstrual cycle.

Answer 7

Follicle stimulating hormone.
oestrogen.
progesterone.
luteinising hormone

Question 8

what is in a food chain.

Answer 8

producer-primary consumer-secondary consumer-tertiary consumer(or apex predator).

Question 9

what is a producer.

Answer 9

plants that make energy or food from the energy of the sun

Question 10

what is biodiversity?

Answer 10

variety of all different species of organisms on earth.

Question 11

list ways to manage biodiversity

Answer 11

Breeding programmes for endangered species.
protecting rare habitats.
encouraging farmers to keep margins and hedgerows in fields
Reducing deforestation and co2 emissions
recycling other than dumping waste in landfills

Question 12

what is an ecosystem?

Answer 12

All living and non-living parts of a habitat.

Question 13

what is interdependence?

Answer 13

when species rely on each other for food shelter and pollination as well as seed dispersal.

Question 14

what is the term used for when species try to get enough resources to themselves amongst other species?

Answer 14

Competition

Question 15

what can doctors give to woman if their level of FSH is too low to stimulate maturation in eggs.

Answer 15

FSH and LH in a fertility drug

Question 16

What does in vitro fertilisation consist of?

Answer 16

• giving women FSH and LH to stimulate the growth of many eggs.
• collecting the eggs from the woman
• fertilising the egg with the fathers sperm in a laboratory
• inserting an egg/s into the woman’s uterus.

Question 17

what are disadvantages of IVF?

Answer 17

emotionally and physically stressful
low success rates
multiple births can cause risk to babies and mother

Question 18

List the stages of the water cycle.

Answer 18

1) the sun’s energy evaporates the water on land turning it into water vapour.
2) the vapour rises and condenses as clouds
3) water falls from the clouds as precipitation
4) it drains into the sea and repeats

Question 19

list the stages of the carbon cycle

Answer 19

1) co2 is removed from the atmosphere by plants(carbon is stored)
2) when plants and respire some carbon is returned into the atmosphere as co2
3) when animals eat plants carbon is stored in them
4) animals respire and some carbon is returned into teh atmosphere as co2
5) animals die and microorganisms feed on their remains and respire
6) combustion of wood also releases co2