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Cell :The Building Block of Life

CBSE · Class 9 · Science

Flashcards for Cell :The Building Block of Life — CBSE Class 9 Science. Quick Q&A cards covering key concepts, definitions, and formulas.

84 questions90 flashcards5 concepts

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A hierarchical flowchart illustrating the complete classification of matter, starting from 'Matter' and branching into 'Physical Classification' (Solids, Liquids, Gases, Plasma, Bose-Einstein Condensa
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90 Flashcards
Card 1कोशिकाओं का परिचय

कोशिका क्या है?

Answer

कोशिका सभी जीवों में संरचना और कार्य की मूल इकाई है। कुछ जीवों में केवल एक कोशिका होती है, जबकि अन्य में कई कोशिकाएँ एक साथ काम करती हैं।

Card 2Introduction to Cells

What is a cell?

Answer

A cell is the basic unit of structure and function in all living organisms. Some organisms have only one cell, while others have many cells working together.

Card 3Introduction to Cells

Why is the cell called the basic unit of life?

Answer

All living organisms are made of cells, and all life processes happen inside cells. Tissues, organs, and organ systems are all built from cells.

Card 4कोशिकाओं का परिचय

कोशिका को जीवन की मूल इकाई क्यों कहा जाता है?

Answer

सभी जीव कोशिकों से बने होते हैं और सभी जीवन क्रियाएँ कोशिकाओं के अन्दर ही होती हैं। ऊतक, अंग और अंग-तंत्र सभी कोशिकाओं से ही बनते हैं।

Card 5कोशिका की खोज और आकार

कोशिकाएँ आम तौर पर नग्न आंखों से क्यों दिखाई नहीं देती हैं?

Answer

मानव नेत्र की विभेदन सीमा 0.1 mm पर 25 cm है। अधिकांश कोशिकाएं इससे बहुत छोटी होती हैं, इसलिए उन्हें स्पष्ट रूप से देखने के लिए एक सूक्ष्मदर्शी की आवश्यकता होती है।

Card 6Cell Discovery and Size

Why are cells usually not visible to the naked eye?

Answer

The limit of resolution of the human eye is 0.1 mm at 25 cm. Most cells are much smaller than this, so a microscope is needed to see them clearly.

Card 7Cell Discovery and Size

What did Robert Hooke observe in 1665?

Answer

Robert Hooke observed box-like compartments in cork using a self-designed microscope of about 200 to 300X magnification and named them cells.

Card 8कोशिका की खोज और आकार

1665 में रॉबर्ट हुक ने क्या देखा?

Answer

रॉबर्ट हुक ने लगभग 200 से 300 गुना आवर्धन वाले स्व-निर्मित सूक्ष्मदर्शी का उपयोग करके कॉर्क में डिब्बे जैसे डिब्बों का अवलोकन किया और उन्हें कोशिकाएँ नाम दिया।

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Frequently Asked Questions

What are the important topics in Cell :The Building Block of Life for CBSE Class 9 Science?
Cell :The Building Block of Life covers several key topics that are frequently asked in CBSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Cell :The Building Block of Life — CBSE Class 9 Science?
Understand the core concepts first, then work through the 84 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
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There are 90 flashcards for Cell :The Building Block of Life covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.

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