The Nature And Variety Of Organisms

Question 1

Tissue

Answer 1

A group of similar cells that work together to carry out a particular function. Eg xylem tissue

Question 2

Organ

Answer 2

A group of different tissues that work together to perform a function.

Question 3

Organ system

Answer 3

A group of organs that work together to perform a particular function

Question 4

Eukaryotic cells, and eukaryotes

Answer 4

Cells that contain a nucleus and other membrane-bound organelles. Found in multicellular organisms such as animals, plants and fungi.

Question 5

Prokaryotic cells, prokaryotes

Answer 5

Simple cells that lack a nucleus and other membrane bound organelles, do have ribosomes, plasmids(extra bits of DNA), circular chromosome, cell wall and membrane.
eg bacteria.

Question 6

Heterotrophs

Answer 6

Animals are heterotrophs meaning they have to get their energy from other organisms

Question 7

Autotrophs

Answer 7

Get energy from the sun, produce their own food

Question 8

Saprotrophs

Answer 8

Eg most fungi, feed using saprophytic nutrition (secrete digestive enzymes, and absorb broke down nutrients)

Question 9

Protoctists

Answer 9

-Single called organism
-have a eukaryotic cell (have a nucleus and some are like plant cells some are like animal cells

Question 10

Pathogens

Answer 10

Organisms that cause disease include some fungi, bacteria and bacteria. Viruses are also pathogens.
Eg
Protoctist- plasmodium, causes malaria
Bacterium- pneumococcus, causes pneumonia
Viruses- influenza virus, causes flu

Question 11

Population

Answer 11

All the organisms of one species in a habitat

Question 12

Community

Answer 12

All the different species in a habitat

Question 13

Ecosystem

Answer 13

All the organisms living in a particular area and all the non-living conditions

Question 14

Abiotic factors

Answer 14

Non living factors eg environmental conditions and toxic chemicals

Question 15

Biotic factors

Answer 15

Availability of food, number of predators, competition