Cell organisation

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Apuntes de la lección

Hierarchy of Cell Organisation

Multicellular organisms organise cells into a hierarchy: cells → tissues → organs → organ systems → organism.
Cells are the basic unit of life; similar cells group to form tissues.
Tissues are groups of similar cells working together to perform a specific function.
Organs are made of different tissues working together; they have a specific function.
Organ systems are groups of organs that work together to carry out a major life process.
The whole organism is made of all organ systems working together.

Example: Animal (Mouse Digestive System)

Epithelial cells line the stomach, providing a protective barrier and aiding nutrient absorption.
Epithelial cells group to form epithelial tissue.
Epithelial tissue joins with other tissues (e.g., muscle, connective) to form the stomach (an organ).
The stomach combines with other organs (e.g., intestines) to form the digestive system.
The digestive system is one of several organ systems that make up the whole organism (mouse).

Example: Plant (Leaf)

Palisade cells are near the leaf surface and contain many chloroplasts for photosynthesis.
Palisade cells group to form palisade tissue.
Palisade tissue joins with other tissues (e.g., spongy mesophyll, epidermis) to form a leaf (an organ).
Leaves combine with other organs (e.g., stems, roots) to form the shoot system.
The shoot system is part of the whole plant organism.

Key Differences: Tissues vs Organs

A tissue is a group of similar cells working together (e.g., epithelial tissue).
An organ is made of different tissues working together (e.g., stomach contains epithelial, muscle, and connective tissues).
Organs have a more complex structure and specific function than tissues.

Palisade Cell Organelles

Chloroplasts: site of photosynthesis; contain chlorophyll to absorb light energy.
Nucleus: contains DNA; controls cell activities.
Vacuole: stores cell sap; helps maintain turgor pressure.
Cell wall: provides structural support (made of cellulose).
Mitochondria: site of aerobic respiration; produce ATP.

Hierarchy of cell organisation in animals (top) and plants (bottom).

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Preguntas de práctica

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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.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.
3.Which of the following is an example of a tissue?
Easy
- Aepithelial tissue
- Bstomach
- Cdigestive system
- Dpalisade cell
4.What type of cell lines the stomach and provides a protective barrier?
Easy
- Aepithelial cell
- Bpalisade cell
- Cnerve cell
- Dred blood cell
5.A group of similar cells working together is called a:
Easy
- Atissue
- Borgan
- Corgan system
- Dorganism
6.In a leaf, which cells contain many chloroplasts for photosynthesis?
Easy
- Apalisade cells
- Bepithelial cells
- Cguard cells
- Dspongy mesophyll cells
7.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
8.What is the organ system that includes the stomach and intestines?
Easy
- Adigestive system
- Brespiratory system
- Ccirculatory system
- Dnervous system

Más preguntas

9.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
10.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
11.Which organelle is abundant in palisade cells and is the site of photosynthesis?
Easy
- Achloroplast
- Bmitochondrion
- Cnucleus
- Dribosome
12.The diagram shows a plant cell. Which labelled structure is the site of photosynthesis?
Medium
- AA
- BB
- CC
- DD
13.In the cell organisation hierarchy, which level comes immediately after 'tissues'?
Easy
- ACells
- BOrgans
- COrgan systems
- DOrganisms
14.Which of the following is a tissue found in the stomach?
Medium
- AEpithelial tissue
- BPalisade tissue
- CNervous tissue
- DMuscle tissue
15.A leaf is an example of which level of organisation?
Easy
- ACell
- BTissue
- COrgan
- DOrgan system
16.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.
17.Which of the following is an organ system?
Easy
- AStomach
- BEpithelial tissue
- CDigestive system
- DPalisade cell
18.In a plant, the shoot system is an example of which level of organisation?
Medium
- ATissue
- BOrgan
- COrgan system
- DOrganism
19.A student observes a sample of cells under a microscope. The cells are rectangular, have a cell wall, and contain many chloroplasts. Which type of cell are they most likely observing?
Medium
- AEpithelial cell
- BPalisade cell
- CRed blood cell
- DNerve cell
20.In the digestive system, which level of organisation does the stomach represent?
Easy
- ACell
- BTissue
- COrgan
- DOrgan system
21.Which of the following correctly 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
- DShoot system → leaf → palisade tissue → palisade cell
22.A student observes a sample of cells under a microscope. The cells are rectangular, have a cell wall, and contain many chloroplasts. Which type of cell are they most likely to be?
Medium
- APalisade cell
- BEpithelial cell
- CRed blood cell
- DNerve cell
23.Which of the following is the correct hierarchy of organisation in a multicellular organism from simplest to most complex?
Easy
- ACells → tissues → organs → organ systems → organism
- BTissues → cells → organs → organ systems → organism
- CCells → organs → tissues → organ systems → organism
- DOrgans → tissues → cells → organ systems → organism
24.A student is asked to prepare a slide of leaf tissue to observe palisade cells. Which of the following steps is essential for obtaining a clear view of chloroplasts?
Medium
- AStaining with iodine solution
- BUsing a thin section of the leaf
- CAdding a drop of water before placing the coverslip
- DUsing the highest magnification objective immediately
25.In the cell organisation of the digestive system, which level does the stomach represent?
Easy
- ATissue
- BOrgan
- COrgan system
- DOrganism
26.Which of the following statements about palisade cells is correct?
Easy
- AThey are found in the roots of plants.
- BThey contain few chloroplasts.
- CThey are adapted for photosynthesis.
- DThey are part of the vascular tissue.
27.A student investigates the effect of light intensity on the rate of photosynthesis in pondweed. Which piece of apparatus is essential for measuring the rate of photosynthesis?
Medium
- AThermometer
- BRuler
- CStopwatch
- DBalance
28.A student is asked to design an experiment to test the effect of temperature on the rate of digestion of starch by amylase. Which of the following would be the most appropriate way to measure the rate of reaction?
Medium
- AMeasure the change in pH over time
- BMeasure the time taken for starch to disappear using iodine solution
- CMeasure the change in mass of the starch solution
- DMeasure the volume of gas produced
29.Which of the following is an example of an organ system in a plant?
Easy
- ALeaf
- BPalisade tissue
- CShoot system
- DChloroplast
30.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
31.A student wants to compare the number of stomata on the upper and lower surfaces of a leaf. Which method would give the most reliable results?
Hard
- ACount stomata in one field of view on each surface under the microscope
- BTake several random samples from each surface and calculate the mean
- CEstimate the number based on leaf size
- DUse a hand lens to count all stomata on both surfaces
32.Which of the following correctly describes the relationship between cells, tissues, and organs?
Easy
- ACells are made of tissues, which form organs.
- BTissues are made of organs, which form cells.
- COrgans are made of tissues, which are made of cells.
- DCells are made of organs, which form tissues.
33.A student sets up an experiment to investigate osmosis in potato cylinders. They place potato cylinders in different concentrations of sugar solution and measure the change in mass after 30 minutes. Which of the following is the independent variable?
Medium
- AChange in mass
- BTime
- CConcentration of sugar solution
- DType of potato
34.A student is testing a food sample for the presence of starch. They add iodine solution and observe a blue-black colour. What does this indicate?
Easy
- AThe food contains protein
- BThe food contains reducing sugar
- CThe food contains starch
- DThe food contains lipid
35.A student wants to investigate the effect of pH on the activity of an enzyme. Which of the following would be the most suitable method to measure the rate of reaction?
Medium
- AMeasure the time taken for a set amount of product to appear
- BMeasure the change in temperature
- CMeasure the change in pH over time
- DMeasure the volume of enzyme used
36.Which of the following is the correct order of cell organisation from simplest to most complex?
Easy
- ACell → tissue → organ → organ system → organism
- BTissue → cell → organ → organ system → organism
- CCell → organ → tissue → organ system → organism
- DOrgan → tissue → cell → organ system → organism
37.A scientist observes a sample of cells from a leaf. The cells are elongated, packed with chloroplasts, and located near the upper surface. Which type of cell are they most likely to be?
Medium
- APalisade cells
- BSpongy mesophyll cells
- CGuard cells
- DEpidermal cells
38.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?
Medium
- A41.5
- B42
- C41
- D40.5
39.In an experiment, a student places a piece of potato (an organ) in a beaker of water. The potato is composed of several tissues. After one hour, the potato becomes firmer. Which process explains this change?
Medium
- AOsmosis
- BActive transport
- CPhotosynthesis
- DTranspiration
40.A student investigates the effect of temperature on the rate of photosynthesis in pondweed. They count the number of bubbles released per minute at 10°C, 20°C, and 30°C. Results: 10°C: 5 bubbles/min; 20°C: 12 bubbles/min; 30°C: 18 bubbles/min. Which conclusion is best supported by the data?
Hard
- AIncreasing temperature increases the rate of photosynthesis up to 30°C.
- BPhotosynthesis occurs fastest at 10°C.
- CTemperature has no effect on photosynthesis.
- DThe optimum temperature for photosynthesis is 30°C.
41.Multicellular organisms are made of many individual cells.
Easy
True or false?
42.The stomach is a tissue.
Easy
True or false?
43.A tissue is made from a group of similar cells working together.
Easy
True or false?
44.Plant leaves are organs.
Easy
True or false?
45.Epithelial cells are needed for photosynthesis.
Easy
True or false?
46.Which level of organisation comes immediately after 'tissues' in the hierarchy?
Easy
- ACells
- BOrgans
- COrgan systems
- DOrganisms
47.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
48.Arrange the following levels of organisation in the correct order from simplest to most complex.
Easy
- Organ system
- Tissue
- Organism
- Cell
- Organ
49.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.
50.A scientist observes a sample of cells from an unfamiliar plant. The cells are rectangular, have a thick cell wall, and contain many chloroplasts. Which level of organisation do these cells represent?
Medium
- ATissue
- BOrgan
- CCell
- DOrgan system
51.Describe the difference between tissues and organs.
Easy
52.Describe an example of cell organisation in a plant. Include a description of how cells are organised into tissues, organs and organ systems.
Medium
53.Describe an example of cell organisation in an animal. Include a description of how cells are organised into tissues, organs and organ systems.
Medium
54.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
55.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

Apuntes de repaso

## 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.

Tarjetas

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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