multicellular organisms

Question 1

use of mitosis

Answer 1

produces new cells for growth and repair of damaged cells, maintains chromosome complement.

Question 2

a cell divides every twenty minutes how many cells produced after one hour?

Answer 2

8

Question 3

what is produced at the end of mitosis

Answer 3

2 identical daughter cells

Question 4

what controls mitosis

Answer 4

nucleus

Question 5

the central nervous system contains

Answer 5

brain and spinal cord

Question 6

cerebrum controls

Answer 6

movement and conscious thoughts

Question 7

cerebellum controls

Answer 7

balance and posture

Question 8

medulla controls

Answer 8

heart rate and breathing

Question 9

how are messages carried around the body

Answer 9

hormones + nerves

Question 10

what are the 3 neurons

Answer 10

sensory- inter - motor

Question 11

what is function of sensory neuron

Answer 11

pass information from sense organs (ears,nose,eyes,hands) to the CNS

Question 12

what is the function of the motor neuron

Answer 12

enable a response to occur at an effector

Question 13

what is the function of an inter neuron

Answer 13

processes information from senses that require a response

Question 14

flow of information order

Answer 14

stimuli-receptor-sensory-motot-effector-response

Question 15

what travels along the sensory neuron

Answer 15

electrical impulses

Question 16

how are responses carried

Answer 16

eletrical impulses

Question 17

how do messages travel from one neuron to another

Answer 17

synapse

Question 18

hormones are released from

Answer 18

endocrine gland

Question 19

hormones are

Answer 19

chemicals traveling in the blood acting slower

Question 20

what hormone causes an increase in blood pressure

Answer 20

insulin

Question 21

what hormone causes a decrease in blood pressure

Answer 21

glucagon

Question 22

what organ produces insulin

Answer 22

pancreas

Question 23

what is the target tissue for insulin and glucagon

Answer 23

liver

Question 24

glucose is

Answer 24

a small soluble carbohydrate

Question 25

what are hormones

Answer 25

chemical messengers

Question 26

what is fertilization

Answer 26

fusion of nuclei of two haploid gametes to produce a diploid zygote which divides to form an embryo

Question 27

describe pollen

Answer 27

male gamete in plants, found in the anthers.

Question 28

describe ovules

Answer 28

female gametes in plants, found in the ovary.

Question 29

events of pollination

Answer 29

transfer of pollen from the anther to the stigma. often carried out by bees.

Question 30

what is variation

Answer 30

genetic differences between individuals of the same species.

Question 31

two types of variation are

Answer 31

discrete, continous

Question 32

example of discrete variation

Answer 32

eye colour, blood type ear lobes

Question 33

example of continuous variation

Answer 33

human hand span, shell diameter in limpets

Question 34

definition of an allele

Answer 34

different forms of a gene

Question 35

definition of phenotype

Answer 35

physical appearance based on the genotypes

Question 36

definition of genotype

Answer 36

an indivuduals allels for a particular characteristiv

Question 37

what organs do plants have

Answer 37

leaves , stem , roots

Question 38

xylem structure

Answer 38

one direction , dead cells, ligmified, water only

Question 39

phloem structure

Answer 39

both direction , living cells , sieve tubes, glucose only

Question 40

whats transpiration

Answer 40

process of water moving through a plant and its evaporation through the stomata in the leaves.

Question 41

what can be used to measure transpiration

Answer 41

potometer

Question 42

what affects transpiration positively

Answer 42

wind speed, temperature, surface area

Question 43

what affects transpiration negatively

Answer 43

humidity

Question 44

how can the cytoplasm be continuous

Answer 44

sieve plates

Question 45

what job does the blood do

Answer 45

transport nutrients ,oxygen and carbon dioxide around the body

Question 46

what is blood made of

Answer 46

red blood cells, white blood cells, plasma

Question 47

name 2 white blood cells

Answer 47

phagocytes lymphocytes

Question 48

atrierys carry blood ________ from the heart

Answer 48

away

Question 49

veins carry blood _____ to the heart

Answer 49

back

Question 50

describe veins

Answer 50

large central channel, thin muscular walls , high pressure

Question 51

describe arteries

Answer 51

small central channels , thick muscular walls, low pressure

Question 52

describe capillarys

Answer 52

allow efficent exchange of materials, large surface area.