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49 Cards in this Set
- Front
- Back
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Name a chemical which is allowed enter through the cell membran |
Water |
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Name a plant tissue |
Xylem |
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What is the function of Xylem |
transport |
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The radicle always grows downwards. What is this called |
Geotropism |
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What is an advantage of a root growing downwards |
A root can get water/minerals and also for anchorage |
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What is the fertile period of the menstrual cycle |
Time during which fertilization/pregnancy can occur |
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When is the fertile period of the menstrual cycle |
1-5 |
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What is the normal temperature of the human body |
37 degrees celcius |
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Name two products excreted by the skin |
Salt and Water |
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How many pairs of chromosones are normally found in a human cell |
23 |
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What name is given to chromosones that affect inheritable traits |
Genes |
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Name two substances from which chromosones are made |
DNA and protein |
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Why do we need to eat starchy foods |
Energy |
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What is an enzyme |
A biological catalyst. Speeds up biological reactions |
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Why is it neccessary to remove chlorophyll from leaf? |
so as to see the colour change. Chlorophyll is a green colour plants use to make food |
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What are the next steps a student would take to see the colour change in the leaf |
Remove the leaf from Alcohol Dip in boiling hot water Add iodine RESULT: Colour change Blue/Black |
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How do apples help the bees? |
They provide food for the bees (nectar/pollen). Provide shelter |
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How do bees help the apples |
Pollination |
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Effect of decrease of bees on apple yield |
fewer apples because there is less polination |
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Which one is in less light intensity |
Pupil dilates to allow more light in to the eye |
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What are the bones X and Y |
X= Femur Y= Fibula |
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Which one is the fibula? |
Fibula is the small one. Tibula is the big one |
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What hydrocarbon compound is the major component of natural gas |
Methane (CH4) |
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What is the meaning of the large number at the beginning of hydrogen peroxide |
There are two moles of hydrogen peroxide present |
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What is the meaning of the small number at the end of O |
There are two atoms of oxygen present |
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Give a balanced equation for the reaction between HCL and Calcium Carbonate |
CaCO3 + 2HCl -------> CO2 + H2O + CaCl2 |
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What type of bonding is present in magnesium oxide |
Ionic |
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What colour does moist litmus paper turn in the present of magnesium oxide |
Blue |
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Name two products formed between the reaction of an acid and base |
a salt and water |
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name two errors the student made |
No clamp, Tap of Burette is open |
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What is the first part of cleaning water called |
Screening |
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What is removed at this stage |
Litter, plastics, etc. |
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One reason why the water is taken from the top at B |
Water at the top is clean because solids have settled to the bottom |
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Why at C is the water passed through a filtration bed |
to remove suspended/small particles |
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Micro-organisms are killed when a certain chemical is added. What is this chemical |
Chlorine Cl2 |
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Name the final process in water treatment |
Flouridation
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Give reasons why the water supplied to our homes is treated |
So that water is safe to drink. Helps teeth. Prevents disease |
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Why do water pipes get damaged during cold winters |
Water expands when cooled below 4 degrees. |
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Metal ion that causes water to be hard |
Calcium |
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Name one way to remove hardness from water: |
Ion exchange. Deionization |
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Name the gas at the right side of the electrode |
Hydrogen |
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Name a material from which the electrodes may be made |
Carbon/Graphite |
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What chemical must be added for electrolysis |
Sodium Sulfate |
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What is the name given to group one of the periodic table |
Alkali metals |
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Diagram of Sodium |
12n, 11p. 2,8,1 |
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Why do sodium and potassium have similar properties |
They both have one electron in their outer shell |
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Potassium plus water |
Potassium Hydroxide + Hydrogen |
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The experiment with the limewater and the air
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Lime water turns milku |
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Why do we know air is a mixture and not a compound? |
Composition of air changes |
