11 Questions
सबै जीवको समूह एक कोशिकाबाट गठित हुन्छ।
True
रोबर्ट हुकले 1665 मा जीवकोशिका खोजेका थिए।
True
कोशिकामा विभिन्न अंगसार्वजनिक कार्यहरूको लागि विभिन्न अंगसहितका अंगहरू छन्।
True
प्लाज्मा मेम्ब्रेन पनि कोशिकाको प्रमुख अंग हो।
True
न्यूक्लियस कोशिकाको नियन्त्रण केन्द्र हो।
True
मिटोकंड्रिया कोशिकाको संजीवनी हुन्।
True
प्लाज्मा मेम्ब्रेनले केवल पादपहरूले मात्र सतत कुरा हेर्ने सेवा प्रदान गर्दछ।
False
कोहि समूहि १00% संरक्षित समूह हुन्।
False
मिटोकंड्रिया ATP मा प्राणीकता माध्यममा मात्र ऊर्जा उत्पन्न गर्दछ।
True
समुद्री पेसीले पानीमा समुनेपनी प्रतिरक्ति हुने कार्यप्रति प्रमुख कुट्पुत्पत् हुन्।
False
कोहि समूह 100% संरक्षित समूह हुन्।
False
Study Notes
A Comprehensive Guide to Science Class 9: Biology
Introduction
Science Class 9 is a fundamental chapter in Biology that provides students with a deeper understanding of life and its various forms. This unit covers topics such as the cell as the fundamental unit of life, the structure of the cell, and the different organelles that perform specific tasks within it.
The Cell as the Fundamental Unit of Life
Every living organism is composed of cells, with unicellular and multicellular organisms being the two primary classifications. The first person to discover the cell was Robert Hooke in 1665.
Organelles and Their Functions
A cell has various organelles, each with a specific role. Some of the key organelles include the plasma membrane, nucleus, mitochondria, endoplasmic reticulum, and vacuoles.
The Plasma Membrane
The plasma membrane, also known as the cell membrane, is a lipid bilayer that surrounds the cell and serves as a selective barrier, controlling the passage of substances in and out of the cell.
The Nucleus
The nucleus is the control center of the cell, containing the genetic material (DNA) that determines the cell's characteristics and functions.
Mitochondria
Mitochondria are often referred to as the powerhouse of the cell, as they generate energy through cellular respiration in the form of ATP.
Endoplasmic Reticulum
The endoplasmic reticulum is involved in protein synthesis and lipid metabolism, with rough ER containing ribosomes and smooth ER lacking them.
Vacuoles
Vacuoles are membrane-bound compartments within the cell that store or transport various substances, such as water, nutrients, or waste products.
Conclusion
Understanding the structure and function of cells is crucial in Biology, as it lays the foundation for understanding the complexity of living organisms. By studying the cell and its various organelles, students can gain a deeper appreciation for the intricacies of life and the processes that sustain it.
Explore the fundamental concepts of Biology Class 9, focusing on the cell as the basic unit of life and the functions of various organelles within it. Learn about the structure of the cell, the roles of organelles like nucleus, mitochondria, endoplasmic reticulum, and vacuoles, and their significance in maintaining life processes.
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