Introducing Science
What is a hypothesis?
A testable idea that explains an observation.
What is the SI unit of length?
Metre (m)
Where is genetic material stored in a cell?
Nucleus
How many life processes must something carry out to be considered alive?
ALL seven
What is the main source of energy for most food chains?
The Sun
Name one difference between observation and prediction.
Observation = using senses;
Prediction = explaining what you observed, with if..then statement
What error occurs when your eye is not at the same level as the measurement?
Name ONE organelle that plant cells have but animal cells do not.
Chloroplast OR Cell Wall OR Large Vacuole
What tool uses YES/NO questions to identify organisms?
Dichotomous Key
What do we call organisms that make their own food?
Producers
What is a variable that you change on purpose?
Independent variable
Name the method used to measure the volume of an irregular object.
Water Displacement Method
Arrange these from smallest to largest:
tissue, cell, organ system, organ, organelles, organisms
Organelles → Cell → Tissue → Organ → Organ system → Organisms
What is the smallest group in the classification system?
Species
What is the role of decomposers in an ecosystem?
Break down dead material and recycle nutrients.
State one strength and one limitation of using scientific models.
Strength: Helps us understand things too small or complex.
Limitation: Not fully accurate; simplified.
A stone increases water level from 50 mL to 67 mL. What is its volume?
17 mL
Which specialised cell has no nucleus and why?
Red blood cell — to carry more oxygen.
Which kingdom does a mushroom belong to?
Fungi
Arrange the food chain:
Hawk, Sun, Grasshopper, Grass, Snake
Sun → Grass → Grasshopper → Snake → Hawk.
Explain why repeating an experiment?
More repeated experiment get more readings to obtain more reliable results.
Define accuracy and precision.
Accuracy: How close to true value.
Precision: How close repeated measurements are to each other.
Explain ONE adaptation of a palisade cell and how it helps its function.
Has many chloroplast. In chloroplast there is a lot of chlorophyll that help to carry out photosynthesis.
Why are horses and donkeys NOT the same species?
Their offspring (mule) is infertile.
If the number of rabbits decreases, what happens to foxes in the same food web? Why?
Foxes decrease (less food).