Science worksheet featuring multiple-choice questions on biology concepts such as photosynthesis, nutrients, and body systems.
Science worksheet with multiple-choice questions about biology topics including photosynthesis, organisms, and human body systems.
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Step-by-step solution for: 18 7th Grade Science Cells Worksheets | Science worksheets, Free ...
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Show Answer Key & Explanations
Step-by-step solution for: 18 7th Grade Science Cells Worksheets | Science worksheets, Free ...
Let's solve the worksheet step by step and explain each answer.
---
- Options:
a. their roots
b. the Sun
c. water
d. soil
Explanation:
Photosynthesis is the process by which plants convert light energy into chemical energy. The primary source of this light energy is sunlight. While water and carbon dioxide are also essential for photosynthesis, the energy comes directly from the Sun.
Answer: b. the Sun
---
- Options:
a. data
b. graph
c. conclusion
d. response
Explanation:
In scientific experiments, the information gathered during the experiment is referred to as "data." Graphs, conclusions, and responses are derived from or based on the data but are not the raw information collected.
Answer: a. data
---
- Options:
a. cells
b. DNA
c. oxygen
d. nutrients
Explanation:
Organisms need nutrients (such as carbohydrates, proteins, fats, vitamins, and minerals) from food to provide energy and support growth. Cells, DNA, and oxygen are important components of life but are not obtained directly from food.
Answer: d. nutrients
---
- Options:
a. scales
b. lungs
c. blood
d. gills
Explanation:
Fish breathe through gills, which extract oxygen from water. Scales protect the fish, lungs are used by terrestrial animals, and blood is part of the circulatory system but not the breathing mechanism.
Answer: d. gills
---
- Options:
a. veins
b. capillaries
c. arteries
d. valves
Explanation:
Veins are blood vessels that transport deoxygenated blood from body tissues back to the heart. Arteries carry oxygenated blood away from the heart, capillaries facilitate exchange between blood and tissues, and valves regulate blood flow but are not vessels.
Answer: a. veins
---
- Options:
a. tissues
b. cells
c. organ systems
d. muscles
Explanation:
Cells are the fundamental units of life and the basic building blocks of all living organisms. Tissues, organ systems, and muscles are composed of cells but are not the most basic unit.
Answer: b. cells
---
- Options:
a. warm-blooded vertebrates
b. cold-blooded vertebrates
c. warm-blooded invertebrates
d. cold-blooded invertebrates
Explanation:
Reptiles, fish, and amphibians are all vertebrates (animals with backbones). They are also ectothermic (cold-blooded), meaning they rely on external sources to regulate their body temperature. Warm-blooded animals include birds and mammals.
Answer: b. cold-blooded vertebrates
---
- Options:
a. immune system
b. digestive system
c. nervous system
d. circulatory system
Explanation:
The immune system defends the body against pathogens (e.g., bacteria, viruses) and other harmful substances. The digestive system processes food, the nervous system controls bodily functions, and the circulatory system transports blood and nutrients.
Answer: a. immune system
---
- Options:
a. Fungi
b. Protista
c. Animalia
d. Plantae
Explanation:
Birds, reptiles, fish, and mammals are all animals, so they belong to the kingdom Animalia. Fungi, Protista, and Plantae are different kingdoms that include non-animal organisms.
Answer: c. Animalia
---
- Options:
a. viruses
b. cells
c. bacteria
d. biomes
Explanation:
All organisms, whether single-celled or multicellular, are composed of cells. Viruses are not considered living organisms because they cannot reproduce independently. Bacteria are single-celled organisms, and biomes refer to large ecosystems, not the structure of individual organisms.
Answer: b. cells
---
1. b. the Sun
2. a. data
3. d. nutrients
4. d. gills
5. a. veins
6. b. cells
7. b. cold-blooded vertebrates
8. a. immune system
9. c. Animalia
10. b. cells
---
\[
\boxed{b, a, d, d, a, b, b, a, c, b}
\]
---
1. Plants are able to carry out photosynthesis using energy from
- Options:
a. their roots
b. the Sun
c. water
d. soil
Explanation:
Photosynthesis is the process by which plants convert light energy into chemical energy. The primary source of this light energy is sunlight. While water and carbon dioxide are also essential for photosynthesis, the energy comes directly from the Sun.
Answer: b. the Sun
---
2. Information collected in an experiment is called
- Options:
a. data
b. graph
c. conclusion
d. response
Explanation:
In scientific experiments, the information gathered during the experiment is referred to as "data." Graphs, conclusions, and responses are derived from or based on the data but are not the raw information collected.
Answer: a. data
---
3. What do organisms obtain in food for growth and energy?
- Options:
a. cells
b. DNA
c. oxygen
d. nutrients
Explanation:
Organisms need nutrients (such as carbohydrates, proteins, fats, vitamins, and minerals) from food to provide energy and support growth. Cells, DNA, and oxygen are important components of life but are not obtained directly from food.
Answer: d. nutrients
---
4. What do fish use to breathe?
- Options:
a. scales
b. lungs
c. blood
d. gills
Explanation:
Fish breathe through gills, which extract oxygen from water. Scales protect the fish, lungs are used by terrestrial animals, and blood is part of the circulatory system but not the breathing mechanism.
Answer: d. gills
---
5. The blood vessels that carry blood back to the heart are
- Options:
a. veins
b. capillaries
c. arteries
d. valves
Explanation:
Veins are blood vessels that transport deoxygenated blood from body tissues back to the heart. Arteries carry oxygenated blood away from the heart, capillaries facilitate exchange between blood and tissues, and valves regulate blood flow but are not vessels.
Answer: a. veins
---
6. The basic building blocks of all living things are
- Options:
a. tissues
b. cells
c. organ systems
d. muscles
Explanation:
Cells are the fundamental units of life and the basic building blocks of all living organisms. Tissues, organ systems, and muscles are composed of cells but are not the most basic unit.
Answer: b. cells
---
7. Reptiles, fish, and amphibians are all
- Options:
a. warm-blooded vertebrates
b. cold-blooded vertebrates
c. warm-blooded invertebrates
d. cold-blooded invertebrates
Explanation:
Reptiles, fish, and amphibians are all vertebrates (animals with backbones). They are also ectothermic (cold-blooded), meaning they rely on external sources to regulate their body temperature. Warm-blooded animals include birds and mammals.
Answer: b. cold-blooded vertebrates
---
8. The human body system that protects the body from diseases is the
- Options:
a. immune system
b. digestive system
c. nervous system
d. circulatory system
Explanation:
The immune system defends the body against pathogens (e.g., bacteria, viruses) and other harmful substances. The digestive system processes food, the nervous system controls bodily functions, and the circulatory system transports blood and nutrients.
Answer: a. immune system
---
9. Birds, reptiles, fish, and mammals belong to the kingdom
- Options:
a. Fungi
b. Protista
c. Animalia
d. Plantae
Explanation:
Birds, reptiles, fish, and mammals are all animals, so they belong to the kingdom Animalia. Fungi, Protista, and Plantae are different kingdoms that include non-animal organisms.
Answer: c. Animalia
---
10. Every organism is made up of one or more
- Options:
a. viruses
b. cells
c. bacteria
d. biomes
Explanation:
All organisms, whether single-celled or multicellular, are composed of cells. Viruses are not considered living organisms because they cannot reproduce independently. Bacteria are single-celled organisms, and biomes refer to large ecosystems, not the structure of individual organisms.
Answer: b. cells
---
Final Answers:
1. b. the Sun
2. a. data
3. d. nutrients
4. d. gills
5. a. veins
6. b. cells
7. b. cold-blooded vertebrates
8. a. immune system
9. c. Animalia
10. b. cells
---
Boxed Final Answer:
\[
\boxed{b, a, d, d, a, b, b, a, c, b}
\]
Parent Tip: Review the logic above to help your child master the concept of science worksheet for 7th grade free.
