Biology Grade 8 Question Preview (ID: 42760)


Biology Grade 8. TEACHERS: click here for quick copy question ID numbers.

What is autotroph
a) Organism that produces it's own food
b) Is dependent on another source
c) None
d) All

What is photosynthesis
a) Plants make their own food
b) It causes a chemical reaction using light energy
c) All
d) None

Photo means _____ Synthesis means ______
a) Photo - light
b) Synthesis - putting together
c) All
d) None

Raw materials
a) Comes from the air and soil
b) Carbon dioxide
c) Water
d) All

Clhorplasts
a) Contains chlorophyll (found in plants)
b) Found in trees
c) Found in the energy of sunlight
d) None

What does Chlorophyll do
a) Absorbs energy from the sun
b) Allows carbon dioxide and water to react
c) All
d) None

Glucose is useful for _____
a) Plants
b) Some of it is used straight away
c) some converted to starch for storage and used later
d) All

What is oxygen
a) A waste product
b) It transports out of leaves into the air
c) All
d) None

Photosynthesis is used to convert
a) carbon dioxide
b) and water into glucose
c) and oxygen
d) All

Maximation
a) Leaves are the most efficient solar panels on earth
b) Light energy is absorbed by chlorophyll
c) Leaves comes in all shapes and sizes but have common features
d) All

Factors of a leave
a) They are wide and flat
b) This creates a large surface to absorb
c) As much light as possible
d) All

Factors of a leave
a) They are thin for gases to reach them easily
b) Has lots of veins to carry water to the cells
c) And carries glucose away
d) All

Factors of a leave
a) It has holes called stomata
b) where gases move in and out
c) All
d) None

Factors of a leave
a) Photosynthesis is a chemical reaction
b) The rate varies depending on 3 main factors
c) Light, carbon dioxide and temperature
d) All

Light and Rate
a) Light energy has to be absorbed by chlorophyll
b) for photosynthesis to take place
c) all
d) none

Light and rate
a) Brighter more energy
b) More light faster
c) All
d) None

Carbon Dioxide is used by plants for
a) food
b) the concentration is low (0.03%)
c) All
d) None

Photosynthesis works best
a) In warm temperatures
b) It is also controlled by enzymes
c) All
d) None

What is a limiting factor - What is the ideal combination of factors for the maximum rate photosynthesis
a) Enough light, Carbon dioxide
b) Ideal temperature
c) All
d) none

What is a limiting factor - What is the ideal combination of factors for the maximum rate photosynthesis
a) If one is restricted the rate will be below maximum possible rate
b) The restricted factor controls how quickly photosynthesis occurs
c) It limits the rate
d) All

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