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Clarisse
1) Cells - a basic unit of organism
2) Tissue - a group of similar cells performing a specific function
3) Organ - consists of several different tissues working together to perform a specific function
4) Cell specialisation - each type of cell performing a specific function in a multicellular organism

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cell, tissue, organ, organ system, organism

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3) Chloroplast
Emily — Chloroplast contains chlorophyll which absorbs light energy from the sun and converts it into chemical energy in the synthesis of glucose during photosynthesis.

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Su Yeon
3) Vacuole has small vesicles containing temporary storage of food, air and water. They have many small temporary vacuoles.
4) Nucleus is the largest organelle in the cell that contains genetic material (DNA) in chromosomes. It controls activities of the cell including cell reproduction, growth, repair of worn-out parts and others.

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Aathmika
1) Cellulose cell wall
- It is made up of cellulose
- supports the cell
- gives the cell a regular shape.
- fully permeable --> allows all substances to pass through

2) Vacuole
- Large central vacuole
- contains cell sap --> consists of water, sugar, salts and other dissolved substances
- It contains temporary storage of food, air and water

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Parts of animal cells
Karissa
1) Cytoplasm/Cytosol - is the site of most chemical reactions occur
Cytosol - fluid portion of the cytoplasm
Cytosol + organelles = cytoplasm

2) Cell surface membrane- selectively permeable and controls movement of substances in and out of the cell.

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1. Cells consists of protoplasm: consists of cytoplasm, nucleus, cell surface membrane

2. Cells contain organelles: organized and specialised structures within the cell that each have a specific function

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Chloe
Prokaryotic cells
- no nucleus as the DNA exists as nucleoids
- its DNA is circular
- it has no membrane-bound organelles
- reproduce quickly
- genetic material are not enclosed in nucleus,
- eg. bacteria, archaea

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Reanne
- contain a nucleus - genetic material (DNA - Linear DNA)
- contains many membrane bound organelles
- enclosed by a plasma membrane
- reproduce slowly (24 hour)
e.g. fungi, plants, animals

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roxanne
- function: open and close the stomata to facilitate gaseous exchange

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Sze Hann
- long and narrow extension--> which increases the surface area to volume ratio for the root hair cell to absorb water and mineral salts from the soil to the rest of the plants, increasing the rate of absorption

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Muhan
- xylem vessels are found in plants. They transport water and mineral salts.

Structure 1:

- in the xylem vessel, there are dead cells along long hollow tubes, without cross walls and does not have protoplasm.

Function 1:
to allow the transport of water and mineral salts upwards easily and quickly without resistance.

Structure 2:
- xylem vessel walls are deposited with lignin.

Function 2:
to provide mechanical support to the plant and prevent collapse of xylem vessels.

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- Contains haemoglobin
-> Haemoglobin combines with oxygen easily, and this helps to absorb and transport oxygen around the body
- Does not contain a nucleus
-> To contain more haemoglobin for transport of more oxygen
- Circular, Biconcave shape
-> Increases surface area to volume ratio of the cell, increasing rate of diffusion of oxygen in and out of the cell
- Elastic
-> Allows it to change shape and easily squeeze through blood capillaries

- The RBCs lacks mitochondria
--> to ensure that the RBCs do not use up the oxygen for respiration that is supposed to be transported to the cells