model of cells

Question 1

Cell theory includes

Answer 1

-all oragnism are made of one or more cells
-The cell is the basic unit of structure and oraganisation in organism
- All cells come from pre-existing cells that have multiplied.

Question 2

What are cells

Answer 2

They are the basic unit of life (since they are the simplest units which make up living organism)

Question 3

Looking at cells

Answer 3

-Human eyes cannot see most cells
-hand lens magnifies 10 times(seen as dots)
-light microscope magnifies 1500(some structures of cell seen)
- Electron microscope can magnify many times more(details seen)

Question 4

name the components of animal cells

Answer 4

nucleus
cytoplasm
mitochondrion
vacuole
cell surface membrane

Question 5

Name the components of plant cells

Answer 5

nucleus
cell surface membrane
cytoplasm
vacuole
mitochondrion
cell wall
chloroplast

Question 5

cells that are diff

Answer 5

red blood cells do not have nucleus
root hair cell do not have chloroplast
cells with diff shapes, e.g. neutron, stomata

Question 6

chracteristics of cell surface membrane

Answer 6

-thin outer layer surrounding cell
-partially or selectively permeable(allow selected substance)
- thin layer of fats and proteins

Question 7

Function of cell surface membrane

Answer 7

controls the movement of substances in and out of the cell

Question 8

Characteristics of cytoplasm

Answer 8

-mostly water with different type of substances such as proteins, carbohydrate, fats and salts
-Contains organelles with specific functions(e.g. nucleus)

Question 9

Function of cytoplasm

Answer 9

Site where most cellularactivities take place

Question 10

Characteristics of nucleus

Answer 10

-Nucleus contain chromating which coils to form a rod like structure called chromosomes.
-each nucleus have 46 chromosomes, in 23 pairs made of DNA.
- Gene is a section of DNA for a special chracteristics(looks)

Question 11

function of nucleus

Answer 11

-controls all cellular axctivities
- contain dna, the hereditary or genetic material in living thing passed down form parents to offspring

Question 12

chracteristics of vacuole

Answer 12

-Fluid filled space
-animal cell-numerous small
plant celss-large central vacuole

Question 13

Functionsof vacuole

Answer 13

animal- store liquid, nutrients and waste material
plant- store cell sap, liquid, nutrients and waste materials

Question 14

characteristics of mitochondrion

Answer 14

-rod shaped organelle

Question 15

Which cell is likely to contain large numers of mitocondrion

Answer 15

Muscles for more energy

Question 16

Function of mitochondrion

Answer 16

Respiration occurs and food substances are oxidised to release energy
Energy released is use for cellular activities e.g. growth

Question 17

Chloroplast charactreristics

Answer 17

Oval shaped organelle
Contains a green pigment called chlorophyll that absorbs light energy

Question 18

Functrion of chloroplast

Answer 18

Allows photosynthesis to occur
(during photosynthesis- light energy is absorbed and then used to convert carbon dioxide and water into sugar for the plant. Oxygen is also produced.

Question 19

characteristic of cell wall

Answer 19

-Every plant cell have cell wall
-mainly mad up of cellulose which form fibre which criss cross to form stong outer opening surrounding cell membrane
-fully permeable(allows all substances to move in and out of the cell

Question 20

Function of cell wall

Answer 20

-Portect and support the cell
-provide rigidity and gives the cell a regular shape
-prevent the cell from bursting

Question 21

why plant cells have cell wall and animal, cell do not

Answer 21

the cell wall provides th eplant cell with strength , shape and rigidity contrbuting to the overall rigidity of the plant ad keep it upright.

Question 22

Why plant cell have chloroplast but not animal cell

Answer 22

Plants do not get their sugar molecules from eating, unlike animals. Hence, plants need chloroplast to trap sunlight to photosynthesis and produce sugar molecules.

Question 23

Why plant cell have large central vacuole and animal cell have numerous small vacuoles.

Answer 23

the vacuole in plant cell mwaintain presure against the inside of the cell wall, giving the cell shape and helping to support the plant

Question 24

what are unicellular organism

Answer 24

Organism made up of only one cell e.g. bacteria, amoebea

Question 25

what are multicellular organism

Answer 25

organisms mad eup of many cells cells specialised in same activity work togeyher.

Question 26

organisation of cells oin a multicellular oranism.

Answer 26

cells with similiar structure group to persom a function is a tisiie(cell of same kind) siff type sof tissue work together to form and organ diff oragn made up organ system(e..g digestive system)

Question 27

oran system in plants

Answer 27

shoot syustem and rootsystem

Question 28

what is the division of labour

Answer 28

brekdown of workload to smaler and mor especific tasks for efficiency.