Class 9 Science: Cell – The Building Block of Life | Competency-Based Case, Image & Data Questions + One-Mark Questions
EnglishWithMRK
@englishwithmrk · englishwithmrk.co.in
DAV Centenary Public School
Ukkunagaram, Visakhapatnam
Ukkunagaram, Visakhapatnam
Cell — The Building Block of Life
Class IX · Science · Biology · Case-Based / Image-Based / Data-Based Questions (NEP 2020 / NCF 2023 pattern)
| Name | Class / Sec | IX / ____ | |
| Roll No. | Date |
Instructions: This paper contains 5 competency-based questions — case-based, image-based and data-based. Each question carries 3 sub-questions of 1 mark each (Total: 15 Marks). Study each passage, diagram or table carefully before answering.
Q1 Case-Based3 × 1 Mark
In 1665, Robert Hooke examined a thin slice of cork under a simple microscope. He observed small, empty, box-like compartments arranged like a honeycomb and named them "cells". Later, Anton van Leeuwenhoek observed living cells swimming in pond water and called them "animalcules".
- Name the structure Robert Hooke observed in cork, and what did he name it?
- Why did Hooke's cork cells appear empty and box-like rather than alive?
- What term is used today for the living moving organisms Leeuwenhoek first observed?
Q2 Image-Based3 × 1 Mark
Study the labelled diagram of a plant cell given below and answer the questions.
- Identify the structure labelled A (the rigid outer boundary present only in plant cells).
- Identify the structure labelled B, which controls all cellular activities.
- Identify the structures labelled C, which are the site of photosynthesis.
Q3 Data-Based3 × 1 Mark
A student compared a plant cell and an animal cell under a microscope and recorded her observations in the table below.
| Feature | Plant Cell | Animal Cell |
|---|---|---|
| Cell wall | Present | Absent |
| Plastids | Present | Absent |
| Vacuole | Large, single, central | Small, few or absent |
| Shape | Fixed, rectangular | Irregular/round |
- Based on the table, which structure gives the plant cell its fixed shape?
- Why does the plant cell not need a large number of small vacuoles, unlike the animal cell?
- Name one organelle present in the plant cell but absent in the animal cell, as shown in the table.
Q4 Case-Based3 × 1 Mark
A student places a peel of onion on one slide and a smear of cells scraped from the inside of his cheek on another slide, stains both with safranin/methylene blue, and views them under a microscope. The onion cells show a distinct rigid outer boundary and are brick-shaped, while the cheek cells are irregular in shape and lack that rigid outer boundary.
- Which structure, seen only in the onion peel cells, helps the student identify them as plant cells?
- Why do the cheek cells appear irregular in shape while onion cells appear regularly brick-shaped?
- Name the outermost living boundary common to both types of cells.
Q5 Image + Data Based3 × 1 Mark
Study the comparison of two basic cell types shown below.
| Feature | Cell Type X | Cell Type Y |
|---|---|---|
| Nuclear membrane | Absent | Present |
| Average size | 0.1 – 5.0 μm | 5 – 100 μm |
| Example | Bacteria | Plant / animal cells |
- Identify Cell Type X and Cell Type Y based on the data given.
- What term describes a cell whose genetic material is not enclosed by a nuclear membrane?
- Which of the two cell types is generally larger in size, according to the table?
Answer Key (For Teacher Use)
Q1 — Case-Based
(a) Small box-like compartments; he named them "cells".(b) Because cork is dead tissue — Hooke was observing empty cell walls, not living contents.
(c) Today they are called unicellular microorganisms/protozoans.
Q2 — Image-Based
(a) A: Cell wall.(b) B: Nucleus.
(c) C: Chloroplasts (plastids).
Q3 — Data-Based
(a) The cell wall gives the plant cell its fixed shape.(b) The single large central vacuole is sufficient to maintain turgor pressure/store cell sap, so many small vacuoles are not required.
(c) Plastids (chloroplasts) or cell wall (any one, as per table).
Q4 — Case-Based
(a) The cell wall.(b) Cheek cells lack a rigid cell wall (bounded only by a flexible cell membrane), so they take irregular shapes; onion cells have a rigid cell wall that gives them a fixed, brick-like shape.
(c) Cell membrane (plasma membrane).
Q5 — Image + Data Based
(a) Cell Type X: Prokaryotic cell (bacterium); Cell Type Y: Eukaryotic cell.(b) Prokaryotic cell.
(c) Cell Type Y (eukaryotic cell) is generally larger.
EnglishWithMRK
@englishwithmrk · englishwithmrk.co.in
Cell — The Building Block of Life
Class IX · Science · Biology · One-Mark Objective / Very Short Answer Questions
| Name | Class / Sec | IX / ____ | |
| Roll No. | Date |
Instructions: Answer all questions. Each question carries 1 mark. Choose the correct option or write the answer in one word/sentence as required.
One-Mark Questions 20 Marks
- Who discovered the cell, and in which year?
- Which structure did Robert Hooke observe and name "cells"?
(a) Onion peel(b) Cork slice(c) Cheek cell(d) Pond water
- Who discovered the living cell (calling it an "animalcule")?
- State the cell theory in one sentence.
- Name the scientist who modified the cell theory to state that all cells arise from pre-existing cells.
- What is the basic structural and functional unit of life called?
- Name the organism considered the smallest complete living cell.
- Define a unicellular organism, and give one example.
- Define a multicellular organism, and give one example.
- Which type of cell lacks a well-defined nuclear membrane?
(a) Eukaryotic(b) Prokaryotic(c) Both(d) Neither
- Give one example of a prokaryotic organism.
- Name the outermost, selectively permeable layer of an animal cell.
- Which cell organelle is known as the "powerhouse of the cell"?
- Name the organelle responsible for photosynthesis in plant cells.
- Which organelle is called the "kitchen of the cell"?
(a) Mitochondria(b) Chloroplast(c) Ribosome(d) Golgi body
- Name the site of protein synthesis in a cell.
- Which organelle packages and sends materials out of the cell?
- Name the organelle known as the "suicide bag" of the cell.
- What is present in a plant cell but absent in an animal cell (name any one rigid structure)?
- What is the function of the large central vacuole found in plant cells?
Answer Key (For Teacher Use)
1. Robert Hooke, in 1665.
2. (b) Cork slice.
3. Anton van Leeuwenhoek.
4. All living organisms are composed of cells, and the cell is the basic structural and functional unit of life.
5. Rudolf Virchow.
6. Cell.
7. Mycoplasma (PPLO).
8. An organism made of a single cell that performs all life functions; e.g., Amoeba.
9. An organism made of many cells that work together; e.g., human beings.
10. (b) Prokaryotic.
11. Bacteria (e.g., E. coli) or blue-green algae (cyanobacteria).
12. Cell membrane (plasma membrane).
13. Mitochondria.
14. Chloroplast.
15. (c) Ribosome.
16. Ribosomes.
17. Golgi apparatus (Golgi body).
18. Lysosome.
19. Cell wall (or plastids).
20. It stores water, ions, and waste materials, and maintains turgor pressure/cell shape.
2. (b) Cork slice.
3. Anton van Leeuwenhoek.
4. All living organisms are composed of cells, and the cell is the basic structural and functional unit of life.
5. Rudolf Virchow.
6. Cell.
7. Mycoplasma (PPLO).
8. An organism made of a single cell that performs all life functions; e.g., Amoeba.
9. An organism made of many cells that work together; e.g., human beings.
10. (b) Prokaryotic.
11. Bacteria (e.g., E. coli) or blue-green algae (cyanobacteria).
12. Cell membrane (plasma membrane).
13. Mitochondria.
14. Chloroplast.
15. (c) Ribosome.
16. Ribosomes.
17. Golgi apparatus (Golgi body).
18. Lysosome.
19. Cell wall (or plastids).
20. It stores water, ions, and waste materials, and maintains turgor pressure/cell shape.
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