Chapter 5: The Fundamental Unit of Life
Learning Notes (Set 1) for Class 9 Science
Exam oriented Study Guide for CBSE Class 9 Science
Here are 10 quick question-and-answer notes to help you revise the key concepts from the chapter on The Fundamental Unit of Life. Use these for a quick study session before your exam!
Question 1: Who was the first person to observe and name "cells"?
Answer: Robert Hooke first observed and named "cells" while examining a thin slice of cork in 1665.
Question 2: What is the primary function of the plasma membrane?
Answer: The plasma membrane regulates the movement of materials in and out of the cell, acting as a selectively permeable membrane.
SOURCE: WWW.QUIZNEST.INQuestion 3: What is diffusion, as it relates to a cell?
Answer: Diffusion is the spontaneous movement of a substance from a region of high concentration to a region of low concentration.
You are on Chapter 5: The Fundamental Unit of Life (Learning Notes for Class 9 Science) Set 1
Question 4: What is osmosis?
Answer: Osmosis is the movement of water molecules through a selectively permeable membrane from a region of high water concentration to a region of low water concentration.
Question 5: What happens to a cell when placed in a hypotonic solution?
Answer: The cell will gain water by osmosis and is likely to swell up.
Question 6: What is the main component of a plant cell wall?
Answer: The plant cell wall is a rigid outer covering mainly composed of cellulose, which provides structural strength.
SOURCE: WWW.QUIZNEST.INQuestion 7: Why are lysosomes also known as "suicide bags" of a cell?
Answer: Lysosomes are called "suicide bags" because their powerful digestive enzymes can burst and digest their own cell if it gets damaged.
Question 8: What is the main role of the Endoplasmic Reticulum (ER)?
Answer: The ER serves as a network of channels for the transport of materials within the cytoplasm and between the cytoplasm and the nucleus.
You are on Chapter 5: The Fundamental Unit of Life (Learning Notes for Class 9 Science) Set 1
Question 9: What are the two types of plastids found in plant cells?
Answer: The two types of plastids are chromoplasts (coloured plastids) and leucoplasts (white or colourless plastids).
Question 10: What is the function of the Golgi apparatus?
Answer: The Golgi apparatus functions in the storage, modification, and packaging of substances manufactured in the cell.
SOURCE: WWW.QUIZNEST.IN
