Biology Grade 8 Question Preview (ID: 42716)


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How is BALANCED CHEMICAL different to photosynthesis
a) Photosynthesis needs
b) CO2+H20----------Glucose + Oxygen
c) All
d) None

What are the steps to test Carbon Dioxide in a Lab
a) Pour lime water into Test Tube
b) Put rubber tube inside the test tube
c) Breath in and out until water becomes merky
d) Al

What is a by-product of photosynthesis
a) Water
b) Air
c) Oxygen
d) None

What are the main sections for a scientific report
a) Hypothesis - Question
b) Discussion - Aim
c) All
d) None

Need for energy drives the interactions and interdependence in an
a) Environment
b) Area
c) Ecosystem
d) None

How does the sun provide energy to the earth
a) The form of radiant light (energy)
b) Heat Energy
c) All
d) none

Photosynthesis is the process
a) Whereby green plants use carbon dioxide from the air
b) Water from the soil
c) And radiant energy from the sun
d) All

Photosynthesis produces a chemical reaction to produce
a) Glucose (food)
b) And oxygen
c) All
d) None

Equation for Sunlight
a) 6CO2+6H20---------(sunlight)C6H12O6+6O2
b) Carbon dioxide, water glucose oxygen
c) All
d) None

Why can plants photosynthesis
a) They are green
b) A pigment that can capture light energy from the sun
c) The contain chlorophyll
d) The last 2

What do plants to glucose
a) Change glucose that they produce into starch
b) That can be stored easily
c) All
d) None

What else do plants produce
a) Cellulose fibres
b) That gives plants strength and support
c) Which provides roughage for our digestive system
d) All

The food that plants produced
a) Are eaten by animals
b) And other animals that eat animals
c) All
d) None

What chemical does the food contain
a) saved energy
b) potential energy
c) water energy
d) none

Starch Testing
a) This test shows that
b) Photosynthesis has occured
c) The production of glucose
d) All

What do you use to test for Starch
a) Salt water
b) Iodine solution
c) Plain water
d) None

Steps for testing Starch
a) Heat a plant in boiling water for 30 seconds
b) Heat in boiling ethanol for a few minutes
c) Ethanol boils at 78o
d) All

Balanced chemical equation for photosynthesis
a) 6CO2 + 6H2O --------------- C6H12O6 + 6O2
b) the aim is to see if leave contains starch
c) All
d) None

What is the result on a leaf after the starch test
a) The colour changes to blue black
b) The colour changes to red
c) The colour changes to black
d) None

When the leaf changes colour
a) starch was not found
b) It means that the leaf contained starch
c) None
d) All

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