September-Life Processes 15/09/16

Question 1

What can pathogens be?

Answer 1

Protoctists-plasmodium>malaria, Fungi-yeast>ring worm, Bacteria-e.coli>food poisoning, Viruses-HIV,flu

Question 2

Describe common features of fungi:(6) and give an example

Answer 2

Example-yeast

• most feed by saprotrophic nutrition(they secrete extra cellular enzymes into the area outside of their body to dissolve the food, so they can absorb the nutrients)
• cell walls, made of chitin
• store carbohydrates as glycogen
• some are single-celled
• others have a body called mycelium made up of hyphae(hyphae contain lots of nuclei)
• can’t photosynthesise

Question 3

Describe common features of protoctists:(2) and give an example

Answer 3

Example-amoeba

• single-celled and microscopic
• some have chloroplasts and are similar to plant cells, others are more like animal cells

Question 4

Describe common features of bacteria:(4) and give an example

Answer 4

Example-e.coli

• most feed off other organisms(both living or dead)
• no nucleus, instead they have a circular chromosome of DNA
• some can photosynthesise
• single-celled and microscopic

Question 5

What is homeostasis?

Answer 5

Control enteral conditions like body temperature and blood glucose, so conditions round the cells remain constant.

Question 6

What are the 8 life processes?

Answer 6

Movement
Respiration

Growth
Reproduction
Excretion
Nutrition
Sensitive
Homeostasis

Question 6

What is respiration?

Answer 6

Process by which living cells release energy from their food.

Question 7

What is nutrition?

Answer 7

Obtaining food/nutrients either by eating or making food.

Question 7

What is movement?

Answer 7

Plants move slowly usually by growing towards light. Animals move faster due to muscle contraction away from predators.

Question 8

What is excretion?

Answer 8

Removal of waste products.

Question 9

What is sensitive?

Answer 9

Able to detect changes in the environment and respond accordingly.

Question 10

What is growth?

Answer 10

Increase in size and a change in the relative size of body parts.

Question 11

What is reproduction?

Answer 11

Producing offspring in order for species to survive.

Question 13

Describe common features of plants:(4) and give an example

Answer 13

Example-flowering plants such as maize

• have chloroplasts so they can photosynthesise
• cells have cell walls, made of cellulose
• store carbohydrates as starch or sucrose
• multicellular

Question 15

Describe common features of animals:(5) and give an example

Answer 15

Example-mammals, humans

• most have some form of nervous coordination, so they can respond rapidly to changes in their environment
• move around from one place to another
• often store carbohydrate in the form of glycogen
• multicellular
• cells-no chloroplast, no cell wall

Question 16

Describe common features of virus:(4) and give an example

Answer 16

Example-HIV

• have a protein coat around some genetic material
• no cellular structure, particles rather than cells-smaller than bacteria
• only reproduce inside living cells
• they infect all types of living organisms

Question 17

What is a pathogen?

Answer 17

A disease causing organism.

Question 18

Why are viruses not classed as an organism?

Answer 18

Viruses don’t excrete
Viruses don’t grow
Viruses don’t control internal conditions

Out of MR GRENSH only does movement and reproduction

Question 19

What are the levels of organisation in an organism?

Answer 19

Organelles ➡️ Cells ➡️ Tissues ➡️ Organs ➡️ Organ System