Modes Of Nutrition

Question 1

Autotrophs

Answer 1

Use simple inorganic molecules to synthesise its own complex organic compounds like sugars (use light or chemical energy and have chloroplasts)

Question 2

Photoautotrophic

Answer 2

Use light energy to convert simple inorganic molecules into complex organic ones (plants + algae and have chloroplasts)

Question 3

Chemoautotrophic

Answer 3

Uses chemical energy from reactions to convert simple inorganic molecules to complex organic ones

Question 4

Heterotrophic

Answer 4

Consume complex organic compounds produced from other organisms as a source of energy to produce its own organic compounds (animals and fungi)

Question 5

Saprotrophic nutrition

Answer 5

Feed on dead decaying matter by extracellular digestion and absorption by diffusion
Bacteria and fungi are saprophytes/ saprobionts

Question 6

Saprotrophs

Answer 6

• Feed on dead/ decaying matter
• No specialised digestive system
• Branching hyphae grow over food material
• Secrete digestive enzymes on food material and food digested outside body
• Soluble products absorbed by diffusion or active transport

Question 7

Holozoic

Answer 7

Involves ingestion, digestion and egestion
Digested intracellularly/ internally

Engulfs prey by endocytosis and contains digestive enzymes
Waste excreted by exocytosis