Life processes

Question 1

What is the acronym for the life proccess? And what does the acronym stand for?

Answer 1

MRS GREN

• Movment
• Resperation
• Sensitivity
• Growth
• Reproduction
• Excretion
• Nutrition

Question 2

What is movement?

Question 3

What is nutriton?

Question 4

What is excretion?

Answer 4

The removal of metabolic waste (chemical reactions in cells) from the system. (E.G. H₂O, CO₂ and urea). Also any excess substances.

Question 5

What is respiration?

Answer 5

A chemical reaction that increases the breakdown of glucose to release energy, this occours in living cells.

Question 6

What is growth?

Answer 6

A permanent increase in size, mass and complexity.

Question 7

What is reproduction?

Answer 7

The ability to produce fertile offspring of the same species.

Question 8

What is aerobic resperation?

Answer 8

Oxygen is needed in order co create energy.

Formulae:

Glucose + oxygen == carbon dioxide + water + energy

C₆H₁₂O₆ + 6O_{2 ++}

Question 9

What is anerboic resperation?

Answer 9

• Does not require oxygen
• Used during high intesity exercise where the body cannot supply enough oxygen to the muscles
• Formulae:

Glucose == lactic acid + energy

C₆H₁₂O₆ == 2C₃H₆O₃ + 2ATP

• Lactic acid is a bi-product which is toxic to the muscles. It restricts movement and can cause cramps.

Question 10

What is a eukaryotic cell?

Answer 10

Cells that contain a nucleus (E.G. plant, animal and fungi cells).

Question 11

What is a prokaryotic cell?

Question 12

What is heterotrophic nutrition?

Question 13

What is autotrophic nutrition?

Answer 13

Ability to make own food (E.G photosynthesis)

Question 14

What is saprotrophic nutrition?

Answer 14

External digestion of dead organisms (E.G fungi on dead trees).