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Practice Class 8 Science MCQ Questions with Answers based on the latest NCERT syllabus. Learn about Kharif crops, microorganisms, yeast, fermentation, cells, and metals with detailed explanations, formulas, concepts, and exam-oriented solutions for CBSE and State Board students.
Do You Know
Chapter Information
Subject: Science
Class: 8
Topics Covered:
- Crop Production and Management
- Microorganisms: Friend and Foe
- Cell – Structure and Functions
- Materials: Metals and Non-metals
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Easy to Moderate
Based On: Latest NCERT Syllabus
Introduction
Science helps us understand how living organisms, crops, microorganisms, and materials behave in our daily life. These concepts are important for developing scientific thinking and are frequently asked in school examinations. Practicing MCQs strengthens conceptual understanding and improves confidence in solving objective questions.
What You Will Learn
✔ Kharif and Rabi crops
✔ Useful microorganisms
✔ Fermentation process
✔ Cell as the basic unit of life
✔ Metals and non-metals
✔ Important NCERT concepts
Why This Topic Is Important
The topics covered in this quiz are frequently asked in CBSE, State Board, Olympiad, and scholarship examinations. Understanding crop seasons, microorganisms, cells, and material properties also helps students relate science to agriculture, food production, medicine, and everyday life.
Exam Relevance
These questions are useful for:
✔ CBSE Exams
✔ State Board Exams
✔ School Tests
✔ Unit Tests
✔ Half-Yearly Exams
✔ Annual Exams
✔ Scholarship Exams
Q1. Which of the following is a Kharif crop?
A) Wheat
B) Gram
C) Pea
D) Maize
Answer: Maize
Concept Behind This Question
Kharif crops are grown during the rainy season and are harvested after the monsoon.
Step-by-Step Solution
Kharif crops are sown with the arrival of the monsoon, generally from June to July.
Examples include:
- Rice
- Maize
- Cotton
- Soybean
- Groundnut
Wheat, gram, and pea are Rabi crops.
Therefore, the correct answer is: Maize.
Exam Tip
Remember:
Kharif = Rainy Season
Rabi = Winter Season
Q2. Which microorganism is used to produce alcohol?
A) Penicillium
B) Yeast
C) Lactobacillus
D) Amoeba
Answer: Yeast
Concept Behind This Question
Yeast converts sugar into alcohol during fermentation.
Step-by-Step Solution
Yeast is a useful fungus used in brewing and baking industries.
It breaks down sugar in the absence of oxygen to produce:
- Alcohol
- Carbon dioxide
Penicillium produces antibiotics.
Lactobacillus converts milk into curd.
Amoeba is a protozoan.
Therefore, the correct answer is: Yeast.
Exam Tip
Remember:
Yeast → Alcohol + Carbon dioxide
Q3. The basic structural unit of living organisms is:
A) DNA
B) Cell
C) Tissue
D) Organ
Answer: Cell
Concept Behind This Question
Every living organism is made up of cells.
Step-by-Step Solution
A cell performs all essential life processes.
Groups of cells form tissues.
Tissues form organs.
Therefore, the cell is the smallest structural and functional unit of life.
Therefore, the correct answer is: Cell.
Exam Tip
Remember:
Cell → Tissue → Organ → Organ System
Q4. The process of conversion of sugar into alcohol is called:
A) Nitrogen fixation
B) Infection
C) Pasteurization
D) Fermentation
Answer: Fermentation
Concept Behind This Question
Fermentation is carried out by yeast.
Step-by-Step Solution
During fermentation,
Sugar is converted into:
- Alcohol
- Carbon dioxide
This process is widely used in food and beverage industries.
Nitrogen fixation is performed by bacteria.
Pasteurization kills harmful microorganisms.
Therefore, the correct answer is: Fermentation.
Exam Tip
Fermentation always involves Yeast in Class 8 NCERT.
Q5. Which of the following is a non-metal but is liquid at room temperature?
A) Oxygen
B) Bromine
C) Mercury
D) Iodine
Answer: Bromine
Concept Behind This Question
Most non-metals are solids or gases, but bromine is an exception.
Step-by-Step Solution
Bromine is the only non-metal that exists as a liquid at room temperature.
Mercury is also liquid, but it is a metal.
Oxygen is a gas.
Iodine is a solid.
Therefore, the correct answer is: Bromine.
Exam Tip
Remember this famous NCERT exception:
Bromine → Liquid Non-metal
Mercury → Liquid Metal
Important Formulas & Concepts
1. Kharif Crops
- Sown during the rainy season.
- Harvested after the monsoon.
- Examples: Rice, Maize, Cotton, Soybean.
2. Rabi Crops
- Grown during the winter season.
- Examples: Wheat, Gram, Mustard, Pea.
3. Fermentation
Sugar → Alcohol + Carbon Dioxide (by Yeast)
4. Cell Theory
- Cell is the basic structural and functional unit of life.
5. Bromine
- Only liquid non-metal at room temperature.
6. Mercury
- Only liquid metal at room temperature.
Related Practice Questions
- Which crop is mainly grown during the winter season?
- Which microorganism is used in baking bread?
- Who discovered the cell?
- Which gas is released during fermentation?
- Which metal is liquid at room temperature?
Mini Quiz Challenge
True or False
- Wheat is a Kharif crop.
- Yeast is used in baking.
- Cell is the basic unit of life.
- Mercury is a non-metal.
- Bromine is a liquid non-metal.
Exam Tips
✔ Remember the difference between Kharif and Rabi crops.
✔ Learn the uses of important microorganisms.
✔ Revise the functions of cells.
✔ Remember important exceptions like bromine and mercury.
✔ Focus on NCERT definitions and examples.
Quick Revision Notes
✔ Maize is a Kharif crop.
✔ Yeast produces alcohol.
✔ Cell is the basic unit of life.
✔ Fermentation converts sugar into alcohol.
✔ Bromine is the only liquid non-metal.
✔ Mercury is the only liquid metal.
Common Mistakes Students Make
❌ Confusing Kharif crops with Rabi crops.
❌ Selecting Lactobacillus instead of Yeast for alcohol production.
❌ Thinking tissue is the basic unit of life.
❌ Confusing fermentation with pasteurization.
❌ Assuming mercury is a non-metal.
Key Takeaways
- Kharif crops are grown during the rainy season.
- Yeast is widely used in alcohol production.
- Cells are the building blocks of all living organisms.
- Fermentation is an important industrial process.
- Bromine is the only liquid non-metal at room temperature.
FAQs
1. Which crop is a Kharif crop?
Maize is a Kharif crop.
2. Which microorganism produces alcohol?
Yeast produces alcohol through fermentation.
3. What is the basic unit of life?
The cell is the basic structural and functional unit of life.
4. What is fermentation?
Fermentation is the process in which yeast converts sugar into alcohol and carbon dioxide.
5. Which non-metal is liquid at room temperature?
Bromine is the only liquid non-metal at room temperature.
Conclusion
These Class 8 Science MCQs cover important NCERT concepts related to agriculture, microorganisms, cells, and materials. Regular practice of objective questions with detailed explanations improves conceptual understanding, boosts confidence, and helps students perform well in school and competitive examinations.
NCERT Reference
Book: NCERT Science Class 8
Relevant Chapters:
- Chapter 1 – Crop Production and Management
- Chapter 2 – Microorganisms: Friend and Foe
- Chapter 8 – Cell – Structure and Functions
- Chapter 4 – Materials: Metals and Non-metals
Based on: Latest NCERT Curriculum (CBSE)
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