section 1) the nature and variety of living organisms

Question 1

MRS GREN

Answer 1

MOVEMENT.
RESPIRATION. (They create chemical reactions breaking down nutrients molecules in a living cell to release energy.
SENSITIVITY. (They can detect or sense stimuli and respond to them.
GROWTH. (They can permanently increase their size or dry mass by increasing cell size or amount.)
REPRODUCTION. (They can make more of the same type of organism as them.)
EXCRETION (They respire waste from metabolism and excess product or toxic substances)
NUTRITION (They can take in or absorb nutrients like organic substances and mineral ions. They contain the raw materials needed for growth and tissue repair)

Question 2

plants

Answer 2

_ Multi-cellular
- Cells contain chloroplast (eg. can carry out photosynthesis)
-have cellulose cell walls
- store carbohydrates like starch or sucrose
EXAMPLES: maize, peas and beans.

Question 3

ANIMALS

Answer 3

• Multicellular
• don’t contain chloroplast (eg. no photosynthesis)
• No cell wall
• have nervous coordination
• can move
• often store carbohydrates like as glycogen.
• EXAMPLES: mammals,insects

Question 4

FUNGI

Answer 4

cant carry out photosynthesis.
- body is usally into a mycelium made from thread like structures called hyphae which contain many nuclei..
- cell walls made of chitin
- they use saprotrophic nutrition.
they may store carbohydrate as glycogen..
- EXAMPLES: Mucor, yeast.

Question 5

BACTERIA

Answer 5

microscopic single celled organisms.
- cell wall
- cell membrane
- cytoplasm
- plasmids.
- no nuclues, contain a circular chromosome of dna.
- most feed off other living or dead organisms.
EXAMPLES: Lactobacillus bulgaricus. Pneumococcus.

Question 6

PROTOCTIST

Answer 6

• Microscopic single-celled organisms.
• some eg.AMOEBA live in pond water and have features like animal cells
• others like CHLORELLA have chloroplasts and are like plants.
  PLASMODIUM - responsible for causing malaria.

Question 7

VIRUSES

Answer 7

• Small particles,
• parasitic
• reproduce only inside living cells
• infect every type of living organism
• wide variety of shapes and sizes
• no cellular structure.
• protein coat
• contain either DNA or RNA
• EXAMPLES: tobacco mosaic virus, flue, HIV

Question 8

pathogen

Answer 8

pathogens are microorganisms that cause disease

may be fungi, bacteria, protoctist or viruses. eg. bacteria release toxins