ICSE Class 9: Cell chapter 2 Question set – The Unit of Life (Comprehensive Guide) unlock

icse class 9 biology Chapter 2 Cell

Explore detailed ICSE Class 9 notes on “Cell – The Unit of Life” with solved questions, MCQs, and explanations. Understand cell structure, functions, and essential concepts.

ICSE Class 9: chapter 2 Question set Cell – The Unit of Life

Answer the Following

Question 1

1. Which type of microscope operates using a single convex lens?
   • A simple microscope operates using a single convex lens.
2. What kind of mirror did Hooke use in his microscope for specimen illumination?
   • Hooke used a concave mirror to illuminate specimens.

Question 2

1. Indicate the maximum magnification possible with a compound microscope.
   • A compound microscope can magnify up to 1000 times.
2. Indicate the maximum magnification possible with an electron microscope.
   • An electron microscope can magnify up to 1,000,000 times.

Provide Answers to the Following

Question 1

1. Mention two organisms consisting of a single cell.
   • Amoeba and Paramecium.
2. Which animal cells are recognized as the longest?
   • Nerve cells.
3. Which cells in the human body can change shape like an amoeba?
   • White blood cells (WBCs).
4. What is the structural form of white blood cells?
   • Irregular.

Question 2

• Cells with a larger surface area-to-volume ratio enhance diffusion. Name the substances that benefit from this feature.
  • Oxygen, carbon dioxide, and nutrients.

Identify Cellular Parts

Question 1

1. Diverse chemical reactions occur with enzyme involvement: Cytoplasm.
2. Chromatin fibers establish a network: Nucleus.
3. The main structural component is cellulose: Cell wall.

Question 2

1. Distinguish between an organ and an organelle.
   • An organ is a structure performing a specific function in the body, whereas an organelle is a specialized structure within a cell performing specific cellular functions.
2. Distinguish between plant and animal cells, highlighting the presence of plastids.
   • Plant cells have plastids, animal cells do not.

Question 3

• Recognize the organelles responsible for:
  1. Enzyme production: Ribosomes.
  2. Solar energy absorption: Chloroplasts.
  3. Protein manufacturing: Ribosomes.
  4. Digestion within the cell: Lysosomes.
  5. Energy production (ATP): Mitochondria.

Question 4

1. Composition of cellulose: Cell wall.
2. An irregular double membrane network: Endoplasmic Reticulum (ER).
3. Presence of a clear aqueous solution: Cytoplasm.
4. Visibility during cell division: Chromosomes.

Question 5 (True/False)

1. Prokaryotic cells possess larger ribosomes. – False. (They have smaller ribosomes.)
2. Mitochondria are present in eukaryotic cells. – True.
3. Amoeba belongs to prokaryotic organisms. – False. (It is eukaryotic.)
4. Nuclear membranes are present in bacteria. – False. (Bacteria are prokaryotic and lack nuclear membranes.)

Match the Following

• Match activities in Column I with corresponding cellular activities in Column II.

Identify Essential Cell Organelles

• The nucleus is crucial for cell survival.

Lifecycle and Functions

1. Lifecycle and death of cells: Cells undergo a lifecycle including division, growth, and death. For example, skin cells regenerate continuously.
2. Excretion of waste by cells: Cells expel waste through the plasma membrane. Example: carbon dioxide from respiration.
3. Nutrient requirements of cells: Cells require nutrients for energy and growth, like glucose for cellular respiration.

Multiple Choice Type Questions (MCQs)

1. Life originates from:
   • (b) A single cell.
2. What is common between a mango plant and a monkey?
   • (d) Cell membrane.
3. Identify the correct pair of organelle and function:
   • (a) Ribosomes — Protein synthesis.
4. How can one differentiate a plant cell from an animal cell?
   • (a) Lack of centrosome.
5. The main component of the plant cell wall is:
   • (c) Cellulose.
6. Which organelle is involved in cellular respiration?
   • (a) Mitochondria.

Very Short Answer Type Questions

1. Cell parts responsible for:
   • Releasing energy: Mitochondria.
   • Producing proteins: Ribosomes.
   • Transferring hereditary information: Nucleus.
   • Starting cell division: Centrosome.
   • Performing hydrolytic functions: Lysosomes.
   • Allowing selective substance entry: Plasma membrane.

True/False

• All animal cells have a cell wall. – False.
• Cell walls are composed of protein. – False.
• Centrosomes are present in animal cells. – True.
• Large vacuoles are characteristic of plant cells. – True.
• Protoplasm surrounds the nucleus. – True.
• Genes are part of chromosomes. – True.
• Anthocyanin pigments are present in cell sap. – True.

Additional Questions

1. How many chromosome pairs are there in human cells? – 23 pairs.
2. Name the chemical substance that makes up genes. – DNA.
3. Match items from Column A with Column B.
4. Fill in the blanks with suitable terms.
5. Write the full forms for abbreviations: DNA, RNA, ATP, SER, RER.
6. Identify plastids and pigments in plant parts.

Short Answer Type Questions

1. Define: Cell organelles, cell inclusions, cytosol, cell sap, cytoplasm.
2. Locations of: Centrosome, chromosome, genes, mesosome, plasmid.
3. Three exclusive features of plant cells and one of animal cells.
4. Why are cells generally small in size?
5. Why is chemical analysis of protoplasm challenging?
6. Difference between organ and organelle.
7. Are elephant cells larger than rat cells? Explain.

Descriptive Answer Type Questions

1. Define cell theory and its proponents.
2. Differences between protoplasm and cytoplasm, nucleolus and nucleus, etc.
3. Explain functions of plasma membrane, ribosome, lysosome, etc.
4. State differences between living cells and bricks.
5. List common characteristics of plant and animal cells.

Structured/Application/Skill Type Questions

1. Given two cell sketches:
   • Identify plant and animal cells.
   • Mention common structures.
   • Specify unique structures for each.

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