Biology

Question 1

what do animal cells and plant cells have in common?

Answer 1

nucleus, cell membrane, mitochondria, ribosomes, cytoplasm

Question 2

what do plant cells have that animal cells dont?

Answer 2

cell wall, chloroplasts, permanent vacuole

Question 3

job of the..

1) nucleus
2) cell membrane
3) ribosomes
4) mitochondria
5) chloroplasts
6) cell wall

Answer 3

1) contains genetic material and controls cell activity
2) controls what enters and leaves the cell
3) where proteins are made in the cell
4) reactions for respirations take place
5) contain chlorophyll which is used in photosynthesis
6) supports the cell and strengthens it

Question 4

what does a yeast cell contain that a bacterial cell doesnt? explain.

Answer 4

a nucleus.

in a bacterial cell the genetic material is not contained in a nucleus

Question 5

what is diffusion?

Answer 5

diffusion is the spreading out of particles from an area of high concentration to an area of low concentration

Question 6

how does diffusion link to a cell membrane? e.g?

Answer 6

a cell membrane contorls what enters and leaves the cell…

dissolved substances can move in and out of the cell via diffusion. e.g is glucose, amino acids and water.

Question 7

name and explain a specialised cell?

Answer 7

sperm cell or red blood cell
sperm cells have tails so they can swim better and are full of mitochondria so that the reaction of respiration to create energy is much higher
red blood cells contain no nucleus so that there is more room for haemoglobin

Question 8

what is a tissue? e.g muscular tissue.

Answer 8

a group of similar cells that carry out a function.

e.g. muscular tissue which contracts to move whatever it is attached to.

Question 9

what is an organ? e.g stomach.

Answer 9

an organ is a group of different tissues which work together to perform a specific function. e.g. muscular tissue moves the stomach to churn up food

Question 10

what is an organ system? e.g. digestive system

Answer 10

a group of organs working together to perform a function. e.g. stomach and small intestines which digest food

Question 11

what is mesophyll tissue?

Answer 11

where most of the photosynthesis takes place

Question 12

what is the xylem and phloems job?

Answer 12

transport minerals and water around the plant.

xylem-water phloem-minerals

Question 13

equation for photosynthesis?

Answer 13

carbon dioxide + water –> oxygen +glucose

Question 14

limiting factors of photosynthesis?

Answer 14

carbon dioxide, light and temperature.

Question 15

what is the green substance in leaves that is used in photosynthesis?

Answer 15

chloroplasts/chlorophyll

Question 16

why is it important that a plant doesnt get too hot?

Answer 16

the enzymes will denature if the plant gets too hot and therefore it will die.

Question 17

three things a gardener can do to make sure they have good plants?

Answer 17

grow in a a greenhouse so that the plants have maximum sunlight, use a paraffin heater which releases co2 and gives off heat.

Question 18

different ways a plant uses glucose?

Answer 18

for respiration, making cell walls, making proteins, stored seeds and stored as starch.

Question 19

what is a habitat?

Answer 19

the place where an organism lives

Question 20

5 environmental factors that can effect the distribution of a organism?

Answer 20

1) temperature
2) water
3) oxygen and carbon dioxide
4) nutrients
5) light

Question 21

two ways of measuring organisms?

Answer 21

1) quadrats in two sample areas

2) placing quadrats along a transect

Question 22

how do you work out the population size?

Answer 22

work out the mean of each quadrat

then multiply the mean by the total area of the habitat