tavua college year 9 basic science worksheet 1- …
TRANSCRIPT
TAVUA COLLEGE
YEAR 9 BASIC SCIENCE WORKSHEET 1- SOLUTION
INSTRUCTIONS- attempt questions at the back of exercise book / on a page and attach to
book later
DAY 1 (31/05)
1. State 2 general safety rules of the science laboratory (any 2)
- Do not enter the science room unless you are with your teacher. Always
wear a lab coat and proper footwear (closed shoes flat shoes) in the
laboratory.
- No running or pushing. The floor is slippery and hard.
- Keep your notebook neat and tidy, and away from where you are doing your
experiment.
- Never eat food or lollies or chew gum in the laboratory, or drink from laboratory
glassware.
- Do not taste or inhale any chemicals or lick anything in the laboratory.
- Always wash your hands after working in the laboratory, and especially
before eating food.
- Pour waste liquids into sinks or waste bottles. Place waste solids into rubbish bins.
Broken glass should be placed in special bins.
- Clean all equipment after use and put it back where you got it from. Clean your work bench after doing experiments.
2. State 2 rules when mixing chemicals
- When heating or mixing substances, never look inside the flask or beaker
.Do not point the open end of test tubes or beakers towards you or others.
Wear safety goggles while heating.
- Follow the correct method for lighting a Bunsen burner.
- After heating equipment, let it cool down before picking it up. This will avoid
burns.
- If you have long hair, keep it tied back and away from flames and chemicals.
- Do not place flammable substances near naked flames.
3. What is the first thing you should do if accidents occur
- Inform the teacher (if spilled chemical then wash affected area with running tap water
first)
4. Draw the safety symbol that you would see on a methylated spirit bottle.
5. The part of leaf which allows gas exchange is
- Stomata
6. The plants can prevent dehydration through their
- Leaf- shiny waxy layer
7. In which part of the plant does sexual reproduction takes place?
- Flower
DAY 2 (1/06)
8. What are the 2 types of microscopes used in a science lab
- Simple
- Compound
9. Differentiate the 2 microscopes
- Simple microscope has only one lens and compound microscope has 2
10. 2 important rules for caring for a microscope (any 2)
- Carry the microscope with two hands: one hand under it (base) and one hand holding
it using the arm.
- Store the microscope in its box or under a dustproof cover.
- Do not try to clean the microscope. Wiping the lenses need only special tissue paper.
- Check that the microscope is working and has all its pieces attached.
11. Write down the steps for lighting a Bunsen burner
- Push the rubber tube on to the gas outlet.
- Close the air hole. You do this by turning the collar.
- Light the match and hold it over the top of the barrel (refer to diagram above).
- Turn on the gas. Always turn on the gas last. (Note: When the air hole is
closed, no air gets in and the colour of the flame is bright yellow. This flame
is called the safety flame. It is not very hot and not good for heating).
- Open the air hole, so that air mixes with gas to produce a hotter, pale blue flame. This
flame is used for heating.
- When the Bunsen burner is not being used for heating, the yellow safety should be
used.
12. Part of the plant responsible for the absorption of sunlight for photosynthesis is
- Leaf
13. Two main products of photosynthesis are
- Oxygen
- Glucose
14. Female parts of the flower is collectively known as
- pistil
DAY 3 (2/06)
15. Give 2 important rules to be followed when heating in a test tube
- Never have the test -tube more than one third full.
- Always use a test- tube holder.
- Point the test-tube away from yourself and others.
- Heat the side of the test-tube, not the bottom.
- Move the test-tube in the flame as you heat it.
16. How are you supposed to hold a thermometer
- Hold it in the middle-never by the bulb as you do not want to measure the temperature
of your hand
17. How should you store thermometer
- In its case
18. Draw the equipment’s used in the science laboratory and state its function: beaker conical
flask, test tube, test tube holder, test tube rack
19. Roots of the plant growing towards water shows positive
- Hydrotropism
20. Secchi disk is a tool used to detect water
- Turbidity
21. Calculate:
- mass of salt = 20 =0.2g/ml
100ml seawater 100
DAY 4 (3/06)
22. Write a report on dissolving salt
Title – Dissolving Salt
DAY 5 (4/06)
23. Write down the symbols of kilo, deca, mili, and micro
- kilo- k
- deca- da
- micro- µ
24. Define volume and mass and how it can be measured
- Volume – how much space something takes up, measured using beakers and
measuring cylinders
- Mass – amount of matter in an object, measured using balance and scales
25. What is the difference between observation and inference
- Observation –something you notice using your senses
- Inference – explanation of what you observed
26. State the importance of a control
- Helps to compare results
27. Label
A – shiny waxy
layer
B- upper
protecting layer
C – palisade
layer
D- stomata
28. DAY 6 (07/06)
TITLE: comparing plastic cups
temp
TIME
0
10
20
30
40
50
60
70
80
90
100
0 10 20 30 40 50
liti's
leilani's
2. leilanis
3. 47ºC
4. 60mins
DAY 7 (08/06)
29. What are corals
- Corals are colonial animals made of interconnected polyps
30. Why are corals easily damaged when touched
- New individuals grow on top of old structure and very less living tissues are found on
top therefore ot gets easily damaged when touched/ disturbed
31. What are the 4 types of coral reef
- Fringing
- Barrier
- Lagoon
- Platform
32. What is the importance of coral reef
- habitat
- source of employment
- source of income
33. Answer questions based on the Food chain
- Sea weed small fish shark
- Sea weed
- Makes food
DAY 8 (09/06)
34. State the difference between hard and soft coral
Hard coral Soft coral
- Have calcium carbonate - Lack calcium carbonate
- Reef building - Does not build reef
35. Explain biotic and abiotic features with two examples of each
- Biotic – living factors eg. Competition, parasitism( symbiotic relationship)
- Abiotic – non living factors eg. Salinity, flood( environmental conditions)
36. How can one measure temperature, humidity, turbidity and salinity
- Temperature – thermometer
- Humidity – cobalt chloride paper
- Turbidity – secchi disc
- Salinity - mass of salt
100ml seawater
DAY 9 (10/06)
37. Write an essay based on the types of interactions
DAY 10 (11/06)
38. Define food chain, producer, herbivore, carnivore, omnivore, decomposer
- Food chain- food/ feeding relationship amongorganism
- Producer – organisms that make their own food
- Herbivore – organisms that feeds on plants
- Carnivore –organisms that feeds on other animals
- Omnivore – organisms that feed on both plants and animals
- Decomposers- breaks down dead matter
39. State how much of energy is passed on and why
- 10% energy is passed on- 90% is used up by the organism for MRS GREN
40. Use the illustration of starch test given below to answer the questions that follow.
(i) Name the chemical substance used to test for the presence of starch.
- Iodine
(ii) What does a negative test indicate?
- Starch is not present
(iii) State the need for boiling the leaf in methylated spirit.
- To remove the green color
(iv) Write the colour observed when starch is present
- Bluish black
DAY 11 (14/06)
41. Explain the phrase MRS GREN
- M – movement
- R – respiration
- S – sensitivity
- G – growth
- R – reproduction
- N - nutrition
42. What is an environment
- Everything around us
43. What are the 2 types of ecosystems
- Terrestrial and aquatic
44. Mangroves play a very important part in our survival.
(i) Describe two ways mangroves are threatened by human activities.
- Land reclamation
- Deforestation
(ii) Describe two ways in which you can contribute to the conservation of our mangroves.
- Fine public
- Have sign boards/educate/ create awareness
45. Describe the role of decomposers in a forest ecosystem.
- Break down dead matter
46. State one importance of transpiration to the plant.
-cools plant
- Helps to draw more water and minerals upwards
- Allows for photosynthesis to occur
47. State the role of guard cells in transpiration.
- Opens and closes the stomata
DAY 12 (15/06)
48. Plant reproduction
- X- ovary
- Function- Contains egg
- Develops into fruit
49. Match the sentences
- Most leaves are broad and flat because this helps the plant to collect more light
- The outer surface is waxy , because this cuts down water loss in dry conditions
- There are many stomata because they help CO2 get into the leaf
- The inner cells have chloroplast because these are where sugars are actually made
- There are veins going to the leaves because they carry water to the leaves
- There are also sieve tubes in the veins because they carry sugar away to the rest of the
plant
DAY 13 (16/06)
50. Matching – match list A with list B
1. B
2. E
3. A
4. F
DAY 14 (17/06)
51. The part of plant which provides anchorage is
A. Leaf
B. Stem
C. Root
D. Flower
52. The process of photosynthesis takes place mainly in
A. Leaf
B. Stem
C. Root
D. Flower
53. The part of the stem which carries food and water to all parts of the plant is
A. Phloem
B. Xylem
C. Epidermis
D. Vascular bundle
DAY 15 (18/06)
54. Essay – Corals
(i) Define corals
(ii) Two types of corals and state two differences of each
(iii) State three importance of corals to humans
(iv) How do humans impose threat to corals and how can it be reduced.