Characteristics
Cells and Organelles
Plants vs Animals
Organ Systems
Food Chains
100
This process is how living things take in and use food for energy and growth.
Nutrition
100
The basic unit of living things is called a __________.
Cell
100
Which group can make their own food using sunlight?
Plants
100
Which system breaks down food into nutrients the body can use?
Digestive system
100
In the food chain Grass → Cow → Man, what role does the cow play?
Primary consumer
200
Name the characteristic of living things that involves removing waste products from the body.
Excretion
200
Which cell structure controls what enters and leaves the cell?
Cell membrane
200
True or False: Animals usually respond more quickly than plants to stimuli.
True
200
Name the organ system responsible for exchanging gases.
Respiratory system
200
What term is used for organisms that make their own food?
Producers
300
Which characteristic allows an organism to react to light, heat, sound, or touch?
Sensitivity (response to stimuli)
300
Name the organelle that produces a cell’s energy.
Mitochondrion (mitochondria)
300
List two major differences between plant and animal cells.
Plant cells have cell walls and chloroplasts; animal cells do not.
300
Match the organ to its system:
Heart
Kidneys
Brain.
Heart — circulatory system
Kidneys — excretory system
Brain — nervous system
300
Give a simple 3-link food chain.
Leaves → Caterpillar → Bird
400
A permanent increase in size and complexity is called __________.
Growth
400
Which two structures are found only in plant cells and not in animal cells?
Cell wall and chloroplasts
400
Give one example of a way plants move to respond to the environment.
Growing toward light (phototropism)
400
Name one specialized cell that is formed in the reproductive system.
Egg cell or Sperm cell
400
What happens if the population of producers decreases dramatically?
Primary consumers would have less food and decline, which would also reduce secondary consumers and disrupt the entire food chain.
500
Give two reasons why reproduction is important for species survival.
Reproduction ensures the continuation of a species and increases genetic variation, which helps organisms adapt over time.
500
Identify these organelles.
1. Cytoplasm
2. Nucleus
3. Cell membrane
4. Mitochondria
5. Cell wall
6. Permanent Vacuole
7. Chloroplast
500
Explain how chloroplasts and cell walls help plants survive in ways animals do not.
Chloroplasts allow plants to make their own food through photosynthesis. Cell walls provide support and protection, helping plants stay upright without moving.
500
In plants, which structures perform a transport function similar to the circulatory system?
Xylem and phloem
500
What is a food web, and how is it related to food chains?
A food web is the combination of several interconnected food chains. It shows how different organisms are linked through multiple feeding relationships within an ecosystem.