Cell organisation

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शिक्षकों के लिए: Cell organisation (KS3 Science, Biology) के लिए इस्तेमाल के लिए तैयार लेसन स्लाइड्स, रिवीज़न नोट्स — इन्हें अपने लेसन में इस्तेमाल करें, या टॉपिक को एक इंटरैक्टिव क्लास एक्टिविटी की तरह चलाएं जिसे आपके शिक्षार्थी लाइव गेम की तरह खेलें।

लेसन नोट्स

The Levels of Organisation

Multicellular organisms organise their cells into a hierarchy, from simple to complex: cells → tissues → organs → organ systems → organism.
A cell is the basic unit of life. Similar cells group together to form a tissue.
A tissue is a group of similar cells working together to do one job.
An organ is made of several different tissues working together.
An organ system is a group of organs working together to carry out a major body function.
The whole organism is made up of all its organ systems working together.

The levels of cell organisation, from a single cell to the whole organism

Animal Example: The Mouse Digestive System

Epithelial cells line the stomach. They provide a protective barrier and help absorb nutrients.
Epithelial cells group together to form epithelial tissue.
Epithelial tissue joins with other tissues (such as muscle tissue) to form the stomach, an organ.
The stomach combines with other organs, such as the intestines, to form the digestive system, an organ system.
The digestive system is one of several organ systems that together make up the whole organism (the mouse).

Summary of cell organisation: the mouse digestive system

Plant Example: The Leaf

Palisade cells are found near the surface of a leaf. They contain many chloroplasts for photosynthesis.
Palisade cells group together to form palisade tissue.
Palisade tissue joins with other tissues to form a leaf, an organ.
Leaves combine with other organs, such as stems and roots, to form the shoot system, an organ system.
The shoot system is part of the whole plant organism.

Summary of cell organisation: the leaf

Tissues vs Organs

A tissue is a group of similar cells working together to do one job, for example epithelial tissue or palisade tissue.
An organ is made of several different tissues working together, for example the stomach contains epithelial tissue, muscle tissue and connective tissue.
An organ has a more complex structure than a tissue, and usually does more than one job.

Organelles in the Palisade Cell

Chloroplast: the site of photosynthesis; contains chlorophyll to absorb light energy.
Nucleus: contains DNA and controls the activities of the cell.
Vacuole: stores cell sap and helps keep the cell firm (turgid).
Cell wall: made of cellulose; supports and protects the cell.
Cytoplasm: the jelly-like substance where most chemical reactions in the cell happen.

Palisade cells in leaf tissue, with organelles labelled

स्लाइड्स

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साइन अप करें — फ्री लॉग इन

प्रैक्टिस सवाल

फ्री प्रीव्यू — 26 में से 8 सवाल। सभी देखने के लिए साइन अप करें।

1.What is the correct order of cell organisation from simplest to most complex?
Easy
- Acells → tissues → organs → organ systems → organisms
- Btissues → cells → organs → organ systems → organisms
- Ccells → organs → tissues → organ systems → organisms
- Dcells → tissues → organ systems → organs → organisms
2.A group of similar cells working together is called a:
Easy
- Atissue
- Borgan
- Corgan system
- Dorganism
3.Which of the following correctly describes an organ?
Medium
- AA structure made of different tissues working together
- BA group of similar cells performing a specific function
- CA group of organs working together
- DA single cell performing a specific function
4.Which of the following is an organ system?
Easy
- AStomach
- BEpithelial tissue
- CDigestive system
- DPalisade cell
5.What type of cell lines the stomach and provides a protective barrier?
Easy
- Aepithelial cell
- Bpalisade cell
- Cnerve cell
- Dred blood cell
6.In the digestive system, epithelial cells form epithelial tissue. Epithelial tissue, along with other tissues, forms the stomach. This is an example of:
Medium
- Acell organisation in an animal
- Bcell organisation in a plant
- Ca unicellular organism
- Da prokaryotic cell
7.Epithelial cells line the stomach. What is the main function of these cells?
Medium
- ATo produce enzymes
- BTo provide a protective barrier and aid in nutrient absorption
- CTo contract and move food
- DTo carry oxygen
8.In a leaf, which cells contain many chloroplasts for photosynthesis?
Easy
- Apalisade cells
- Bepithelial cells
- Cguard cells
- Dspongy mesophyll cells

और सवाल

9.Which organelle is abundant in palisade cells and is the site of photosynthesis?
Easy
- Achloroplast
- Bmitochondrion
- Cnucleus
- Dribosome
10.Which of the following lists the levels of organisation in a plant from simplest to most complex?
Medium
- Apalisade cell → palisade tissue → leaf → shoot system
- Bpalisade tissue → palisade cell → leaf → shoot system
- Cleaf → palisade tissue → palisade cell → shoot system
- Dpalisade cell → leaf → palisade tissue → shoot system
11.Which of the following is an example of an organ system in a plant?
Easy
- ALeaf
- BPalisade tissue
- CShoot system
- DChloroplast
12.A leaf is an example of which level of organisation?
Easy
- ACell
- BTissue
- COrgan
- DOrgan system
13.Which of the following statements is true?
Medium
- AMulticellular organisms are made of many individual cells.
- BThe stomach is a tissue.
- CPlant leaves are not organs.
- DEpithelial cells are needed for photosynthesis.
14.Which statement about palisade cells is correct?
Medium
- AThey contain few chloroplasts because they are near the leaf surface.
- BThey are adapted for photosynthesis by having many chloroplasts.
- CThey form part of the leaf's vascular tissue.
- DThey are found in the lower epidermis of the leaf.
15.Which of the following statements about cell organisation are correct? Select all that apply.
Medium
- AEpithelial cells line the stomach and aid in nutrient absorption.
- BPalisade cells contain many chloroplasts for photosynthesis.
- CThe stomach is an example of a tissue.
- DA leaf is an organ composed of different tissues.
- EThe shoot system includes leaves and stems.
16.Match each level of organisation to the correct example from a plant.
Medium
- Cell
- Tissue
- Organ
- Organ system
- Palisade cell
- Palisade tissue
- Leaf
- Shoot system
17.Arrange the following levels of organisation in the correct order from simplest to most complex.
Easy
- Organ system
- Tissue
- Organism
- Cell
- Organ
18.Multicellular organisms are made of many individual cells.
Easy
True or false?
19.The stomach is a tissue.
Easy
True or false?
20.Plant leaves are organs.
Easy
True or false?
21.Epithelial cells are needed for photosynthesis.
Easy
True or false?
22.Describe the difference between tissues and organs.
Easy
23.Describe an example of cell organisation in a plant. Include a description of how cells are organised into tissues, organs and organ systems.
Medium
24.Describe an example of cell organisation in an animal. Include a description of how cells are organised into tissues, organs and organ systems.
Medium
25.A student counts the number of chloroplasts in 10 palisade cells from a leaf and records: 38, 42, 45, 40, 39, 41, 43, 44, 42, 41. What is the mean number of chloroplasts per cell? Give your answer to one decimal place.
Medium
26.A student counts the number of chloroplasts in 10 palisade cells from a leaf and records: 38, 42, 45, 40, 39, 41, 43, 44, 42, 41. What is the mean number of chloroplasts per cell? Give your answer to one decimal place.
Medium
- A37.3
- B45.7
- C49.9
- D41.5

रिवीज़न नोट्स

## Cell Organisation Multicellular organisms organise cells into a hierarchy: **cells → tissues → organs → organ systems → organism**. - **Cells**: Basic unit of life. E.g., epithelial cells line the stomach (protection, absorption); palisade cells in leaves have many chloroplasts for photosynthesis. - **Tissues**: Groups of similar cells working together. E.g., epithelial tissue (from epithelial cells); palisade tissue (from palisade cells). - **Organs**: Different tissues joined together. E.g., stomach (made of epithelial tissue and others); leaf (made of palisade tissue and others). - **Organ Systems**: Organs working together. E.g., digestive system (stomach, intestines); shoot system (leaves, stems). - **Organism**: The whole living thing. ### Examples - **Animal (mouse digestive system)**: Epithelial cells → epithelial tissue → stomach (organ) → digestive system → mouse. - **Plant (leaf)**: Palisade cells → palisade tissue → leaf (organ) → shoot system → plant. ### Key Points - The stomach is an **organ**, not a tissue. - Epithelial cells are for protection/absorption, **not** photosynthesis. - Palisade cells contain chloroplasts for photosynthesis.

Cell: The basic unit of life.
Tissue: A group of similar cells working together to perform a function.
Organ: A structure made of different tissues working together.
Organ system: A group of organs working together to perform a major function.
Epithelial cell: A cell that lines the stomach, providing a protective barrier and aiding in nutrient absorption.
Palisade cell: A leaf cell near the surface with many chloroplasts for photosynthesis.

फ्लैशकार्ड

What is the hierarchy of cell organisation from simple to complex?

Cells, tissues, organs, organ systems, organisms.

What are multicellular organisms made of?

Many individual cells that work together.

What is a tissue?

A group of similar cells working together.

What is an organ?

A structure made of different tissues working together to perform a specific function.

What is an organ system?

A group of organs that work together to perform a major function.

Give an example of cell organisation in an animal.

Epithelial cells form epithelial tissue; epithelial tissue and other tissues form the stomach; the stomach and other organs form the digestive system; the digestive system is part of the mouse organism.

What are epithelial cells?

Cells that line the stomach, providing a protective barrier and aiding in nutrient absorption.

What tissue do epithelial cells form?

Epithelial tissue.

What organ is formed from epithelial tissue and other tissues?

The stomach.

What organ system includes the stomach and intestines?

The digestive system.

Give an example of cell organisation in a plant.

Palisade cells form palisade tissue; palisade tissue and other tissues form a leaf; leaves and other organs form the shoot system.

What are palisade cells?

Cells near the leaf surface with many chloroplasts for photosynthesis.

What tissue do palisade cells form?

Palisade tissue.

What organ is formed from palisade tissue and other tissues?

A leaf.

What organ system includes leaves?

The shoot system.

True or false: Multicellular organisms are made of many individual cells.

True.

True or false: The stomach is a tissue.

False. The stomach is an organ.

True or false: A tissue is made from a group of similar cells working together.

True.

True or false: Plant leaves are organs.

True.

True or false: Epithelial cells are needed for photosynthesis.

False. Palisade cells are needed for photosynthesis.

What is the difference between a tissue and an organ?

A tissue is a group of similar cells working together; an organ is made of different tissues working together.

Describe an example of cell organisation in a plant.

Palisade cells (with chloroplasts) form palisade tissue; palisade tissue and other tissues form a leaf (organ); leaves combine with other organs to form the shoot system (organ system).

Describe an example of cell organisation in an animal.

Epithelial cells line the stomach; they form epithelial tissue; epithelial tissue and other tissues form the stomach (organ); the stomach and intestines form the digestive system (organ system).

Name three organelles found in a palisade cell and their purposes.

Chloroplasts (photosynthesis), nucleus (controls cell activities), cell wall (provides structure and support).

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