bio paper 2 short QandA

Question 1

internal conditions that need to be maintained

Answer 1

body temp
water content
blood glucose concentration

Question 2

homeostasis

Answer 2

maintaining stable internal environment

Question 3

what changes the shape of the lens by contracting or relaxing?

Answer 3

ciliary muscles

Question 4

what refracts light onto the retina?

Answer 4

cornea and then the lens

Question 5

cerebral cortex

Answer 5

control consciousness, intelligence, memory and language

Question 6

medulla

Answer 6

controls unconscious activities- heartbeat and breathing

Question 7

cerebellum

Answer 7

concerned with coordiantion of muscular activity

Question 8

sensory neurone

Answer 8

carries impulse from receptors to CNS

Question 9

relay neurone

Answer 9

link neurones in CNS

Question 10

motor neurone

Answer 10

carries impulses from CNS to effetor

Question 11

nervous system order

Answer 11

stimulus
receptors
coordinator
effector
response

Question 12

FSH

Answer 12

pituatary gland- makes egg mature

Question 13

Oestrogen

Answer 13

ovaries-stimulates lining of uterus to grow again

Question 14

LH

Answer 14

pituitory gland- causes ovulation

Question 15

Progesterone

Answer 15

ovaries- maintains lining of uterus

Question 16

Progesterone inhibits or causes FSH production?

Answer 16

inhibits

Question 17

Progesterone inhibits or causes LH production?

Answer 17

inhibits

Question 18

Oestrogen inhibits or causes FSH production?

Answer 18

inhibits

Question 18

close focus

Answer 18

lens is thicker so light is refracted more strongly

Question 19

distance focus

Answer 19

lens is thinner so light only slightly refracted

Question 20

if object is near then ciliary muscles…

Answer 20

contract

Question 21

if object is far then ciliary muscles…

Answer 21

relax

Question 22

if object is near then suspensory ligaments are…

Answer 22

slack

Question 23

if object is far then suspensory ligaments are…

Answer 23

tight

Question 24

near object means...

Answer 24

rounder/ flatter lens

Question 25

far object means...

Answer 25

stretched/thinner lens

Question 26

DNA bases pairing

Answer 26

A-T C-G

Question 27

vasodilation

Answer 27

body temp too high

Question 28

vasoconstriction

Answer 28

body temp too low

Question 29

hypertonic

Answer 29

more sat/less water on outside of cell

Question 30

isotonic

Answer 30

same salt/water inside and outside cell

Question 31

hypotonic

Answer 31

lower salt/ more water outside cell

Question 32

osmoregulation

Answer 32

regulation of water levels

Question 33

polydactyl

Answer 33

extra fingers/toes dominant allele

Question 34

cystic fibrosis

Answer 34

mucus in air passages recessive allele

Question 35

genotype

Answer 35

genetic makeup in a nucleus

Question 36

phenotype

Answer 36

characteristic caused by genotype

Question 37

homozygous

Answer 37

chromosome pair made of same alleles

Question 38

heterozygous

Answer 38

pair of chromosomes made of different alleles

Question 39

species

Answer 39

group of organisms that can interbreed to produce fertile offspring

Question 40

central nervous system

Answer 40

brain and spinal chord

Question 41

peripheral nervous system

Answer 41

connects CNS to rest of body

Question 42

phototropism

Answer 42

response to light

Question 43

geotropism

Answer 43

response to gravity

Question 44

hydrotropism

Answer 44

response to water

Question 45

posotive tropism

Answer 45

towards stimulus

Question 46

negative tropsim

Answer 46

away from stimulus

Question 47

What hormone is responsible for growth in plants?

Answer 47

auxin

Question 48

hyperopia

Answer 48

long sighted cant see up close rays meet behind retina

Question 49

myopia

Answer 49

short sighted cant see far away rays meet in front of retina

Question 50

type 2 diabetes

Answer 50

body stops responding to insulin

Question 51

type 1 diabetes

Answer 51

pancreas doesnt make enough insulin

Question 52

synapse

Answer 52

gap between neurones

Question 53

effectors

Answer 53

muscles or glands that bring about a response

Question 54

receptors

Answer 54

cells that detect change in environment

Question 55

nerve

Answer 55

bundle of neurones

Question 56

stimuli

Answer 56

changes in environment

Question 57

coordination centres

Answer 57

areas that receive and process information and coordinate a response

Question 58

where is the thermoregulatory centre?

Answer 58

hypothaloumus of the brain

Question 59

neurone pathway

Answer 59

stimulus receptor sensory neurone CNS-relay neurone motor neurone effectors response

Question 60

if light intensity low then..

Answer 60

pupil dilated circular muscles relaxed radial muscles contracted

Question 61

if light intensity high then

Answer 61

pupil constricted circular muscles contracted radial muscles relaxed

Question 62

iris

Answer 62

has sets of muscles that control the size of the pupil and regulate the light reaching the retina

Question 63

ciliary muscles ans suspensory ligaments

Answer 63

hold lens in place and allow focusing of the light onto the retina

Question 64

retina

Answer 64

stimulates light sensitive cells and sends nerve impulses

Question 65

optic nerve

Answer 65

carries impulses from retina to brain

Question 66

sclera

Answer 66

stops eyeball being easily damaged