5. The Fundamental Unit of Life Class 9 Science [LATEST] Solutions Chapter Review in English - CBSE Study
NCERT Solutions for Class 9 Science are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important 5. The Fundamental Unit of Life with detailed explanations and step-by-step answers for better exam preparation. Each Chapter Review is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 9 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science.
Class 9 English Medium Science All Chapters:
5. The Fundamental Unit of Life
1. Chapter Review
Chapter Review:
- The fundamental organisational unit of life is called cell.
- Cells were first discovered by Robert Hooke in 1665.
- The movement of water molecules through such a selectively permeable membrane is called osmosis.
- The plasma membrane is flexible and is made up of organic molecules called lipids
and proteins. - Nucleus is a largest cell organelle which consists inside the cell. Nuclei are found in all eukaryotic cells. It contains chromatin. Nucleus is a largest cell organelle which consists inside the cell. Nuclei are found in all eukaryotic cells. It contains chromatin.
- Cellulose is a complex substance and provides structural strength to plants.
- The nucleus has a double layered covering called nuclear membrane.
- Functional segments of DNA are called genes.
- Mitochondria are known as the powerhouses of the cell.
- ATP is known as the energy currency of the cell.
- The internal organisation of the plastids consists of numerous membrane layers embedded in a material called the stroma.
- Most plant cells have large membranous organelles called plastids, which are of two types – chromoplasts and leucoplasts.
- Chromoplasts that contain chlorophyll are called chloroplasts and they perform photosynthesis.
- Most mature plant cells have a large central vacuole that helps to maintain the turgidity of the cell and stores important substances including wastes.
- If the medium surrounding the cell has a higher water concentration than the cell is known as hypotonic solution.
- If the medium has exactly same water concentration than the cell is known as isotonic solution.
- If the medium surrounding the cell has a lower concentration then the cell is known as hypertonic solution.
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