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Question 1: What is considered the smallest unit that can be alive?
- A cell
- An organ
- A molecule
- An atom
Answer: A. A cell
Explanation: According to cell theory, the cell is the basic structural and functional unit of all living organisms, making it the smallest unit that is considered alive.
Question 2: Which part of a cell acts as a boundary to control what enters and leaves?
- The nucleus
- The cell wall
- The cell membrane
- The cytoplasm
Answer: C. The cell membrane
Explanation: The cell membrane serves as a protective barrier that regulates the movement of substances into and out of the cell, maintaining internal balance.
Question 3: What pigment in plant cells captures sunlight energy for photosynthesis?
- Chlorophyll
- Carbon dioxide
- Glucose
- Oxygen
Answer: A. Chlorophyll
Explanation: Chlorophyll is the green pigment found in plant cells that absorbs light energy, which is then used to drive the chemical process of photosynthesis.
Question 4: What are the primary products created during photosynthesis?
- Water and sunlight
- Nitrogen and heat
- Carbon dioxide and soil
- Sugar and oxygen
Answer: D. Sugar and oxygen
Explanation: During photosynthesis, plants use sunlight, water, and carbon dioxide to produce sugar, which provides energy, and oxygen, which is released into the air.
Question 5: Which organisms make their own food in an ecosystem?
- Producers
- Consumers
- Predators
- Decomposers
Answer: A. Producers
Explanation: Producers, such as plants, are organisms that create their own food using energy from the sun, forming the base of most food webs.
Question 6: What is the role of decomposers in a food web?
- Hunting prey
- Breaking down dead matter
- Eating producers
- Creating sunlight
Answer: B. Breaking down dead matter
Explanation: Decomposers play a vital role by breaking down dead organic matter, which recycles nutrients back into the ecosystem for other living things to use.
Question 7: What is the relationship called when one animal hunts and eats another?
- Producer-consumer
- Decomposer-producer
- Abiotic-biotic
- Predator-prey
Answer: D. Predator-prey
Explanation: In an ecosystem, a predator is an organism that hunts and eats another organism, known as the prey, which is a fundamental biological relationship.
Question 8: Which of these is an example of an abiotic factor in an ecosystem?
- Plants
- Animals
- Temperature
- Bacteria
Answer: C. Temperature
Explanation: Abiotic factors are non-living parts of an environment, such as temperature, water, and sunlight, which influence the survival of living organisms.
Question 9: What is the first part of a plant to emerge from a seed?
- The stem
- The leaf
- The flower
- The root
Answer: D. The root
Explanation: The root is the first structure to emerge from a germinating seed, allowing the young plant to anchor itself and begin absorbing water and nutrients.
Question 10: Which of these is an example of an organism reacting to its environment?
- A rock rolling down a hill
- A lizard warming up in the sun
- A cloud moving with the wind
- A river flowing to the ocean
Answer: B. A lizard warming up in the sun
Explanation: Living things react to their environment; for example, a lizard becomes more active as it warms up in the sun to regulate its body temperature.