chapt 6 : model of cells

Question 1

what is a unicellular organism

Answer 1

an organism that is only made up of 1 cell

Question 2

what is a multicellular organism

Answer 2

an organism that is made up of many cells .

Question 3

what is a vacuole and what does it contain in an animal cell

Answer 3

a vacuole is a fluid filled space enclosed in a membrane
it contains liquid, food and waste substances

Question 4

what is the function of a mitochondria

Answer 4

it is involved in the release of energy from food substances during respiration .

Question 5

what does a nucleus contains and what is its function

Answer 5

the nucleus contains DNA
its function is to control chemical reactions in the cell

Question 6

what is a cytoplasm, what does it contain and what is its function

Answer 6

a cytoplasm is a jelly-like substance which contains water and other substances . it is a medium for chemical reaction to take place in

Question 7

what is a cell membrane, what is it made up of and what is its function

Answer 7

a cell membrane is a thin outer layer that surrounds the cell. it is made up of fats and protein and its function is to control the movement of substances in and out of the cell

Question 8

what does a vacuole in a plant cell contain and what is its function

Answer 8

the cell sap contains water and dissolved food substances like salt and sugar.
its function is to help keep the cell firm by taking in water

Question 9

what is a chloroplast, what does it contain and what is its function

Answer 9

a chloroplast has a disc-like structure
and it contains chlorophyll which absorbs energy for the plant to make food. it is the site of photosynthesis

Question 10

what is the cell wall, what is it made up of and what is its function

Answer 10

a cell wall is a tough outer covering of the plant cell. it is made up of cellulose and its function is to protect and support the cell, giving the cell a regular shapen

Question 11

what is a chromosome and what does it contain

Answer 11

a chromosome are like hair like structures in the nucleus which contains genes and DNA.

Question 12

what are genes

Answer 12

genes contains information for a specific feature

Question 13

what is DNA

Answer 13

dna contains all the necessary information for the devlopment of cells in an organism

Question 14

what is a protoplasm and what does it contain

Answer 14

a protoplasm is made up of 70%-90% water and has mineral salts and organic compounds. it contains of a nucleus, cytoplasm and cell membrane.

Question 15

what are the level of organisation in an organism

Answer 15

cell>tissue>organ>system>organism

Question 16

definition of cell

Answer 16

cells are the smallest unit of life

Question 17

definition of tissues

Answer 17

tissues are a group of the same types of cell working together to perform a common function

Question 18

definition of organs

Answer 18

organs are a group of different tissues working together to perform a common function

Question 19

defintiion of systems

Answer 19

systems are a group of different organs working together to perform a common function.

Question 20

definition of organism

Answer 20

organism is formed when a group of different systems work togehter to support its life

Question 21

what are the advantages of the division of labour in a multicellular organism

Answer 21

it ensures a smooth and efficient functioning of the multicellular organism and its survival
it enables different functions to be carried out at the same time.

Question 22

definition of division of labour at a cellular level

Answer 22

different parts of a single cell perform different functions in a coordinated way, this allows the ccell to function effectiviely and efficiently