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How are multicellular organisms organised?

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cell -> tissue -> body system -> organ

cell -> tissue -> organ -> body system

cell -> organ -> tissue -> body system

tissue -> cell -> organ -> body system

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What is the function of the sperm cell?

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To transport hormones around the body.

Fertilisation where its nuclei fuses with an egg cells nuclei to form a diploid zygote.

To trnasport oxygen around the body.

Fertilisation where its nuclei fuses with an sperm cells nuclei to form a diploid zygote

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Match the different parts of body organisation to their description.

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Cell
Tissue
Organ
Body System

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The basic unit of life because it is the smallest unit that can lead an independent life.
A group of related tissues and organs (such as blood, heart, arteries, capillaries and veins).
A group of specialised cells working together to perform a particular function.
A structure composed of several different tissues coordinated to perform one or more functions.

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Egg cells are specialised cells. Match their specialised features with how it helps them perform their specific function.

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Large cell with yolky cytoplasm
They are haploid

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To provide food for the zygote
To allow fusion with a sperm cell to produce a diploid zygote

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Sperm cells are specialised cells. Match their specialised features with how it helps them perform their specific function.

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They have a tail
They have many mitrochondria
They are haploid

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So they can swim and move to the egg
For energy
To allow fusion with an egg cell to produce a diploid zygote

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Red blood cells are specialised cells. Match their specialised features with how it helps them perform their specific function.

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Biconcave shape
No nucleus
Small and flexible

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Increases the surface area which allows for oxygen to be kept close to the surface increasing gas exchange.
There is more room for haemoglobin and oxygen.
So they can squeeze through narrow capillaries.

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What are the plants organs?

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Phloem

Flower

Guard cell

Pallisade layer

Stem

Leaves

Spongy mesophyll layer

Xylem

Roots

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What is the function of the egg cell?

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To trnasport oxygen around the body.

Fertilisation where its nuclei fuses with a sperm cells nuclei to form a diploid zygote.

Fertilisation where its nuclei fuses with a egg cells nuclei to form a diploid zygote.

To transport hormones around the body.

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What are the animals organs?

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Lungs

Stem

Nerve

Stomach

Cheek Epithelium

Kidneys

Skin

Liver

Cillia

Heart

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Match the specialised animal cell characteristic with its function.

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Epithelial cheek cells which are a flat and irregular shape.
Red blood cells which are bioconcave in shape with no nucleus and they are small and flexible.
White blood cells are able to change shape and some contain sacs of microbe-digesting enzymes.
Motor neurons which have axons which are long insulated extension of cytoplasm.
Goblet cells which are cup shape.
Ciliated epithelial cell.
Smooth muscle cells.

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Hair-like cilia that beat upwards which sweeps dirty mucus up and away from the lungs.
Secretion of mucus, which traps dirt and germs.
Movement of food down oesophagus by peristalsis.
Transmission of nerve impulses.
Uptake and transport of oxygen around the body.
Destruction of invading microbes.
Protection of mouth lining.

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Why is the specialisation of cells important?

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Specialisation of cells, in animals and plants, leads to the formation of a

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of tissues and organs. These specialised cells can perform

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functions.

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Match the specialised plant cell characteristic with its function.

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Epidermal cell which are irregular shape which fit together like a jigsaw.
Guard cells which are sausage shape and have chloroplasts present.
Palisade mesophyll are densley packed with chloroplasts.
Spongy mesophyll which are ‘Round’ shapes and loosely arranged with moist air spaces.
Sieve tubes are sieve plates with continuous stream of cytoplasmic strands with no nucleus.
Companion cell contains a nucleus.
Xylem vessel a deal hollow tube strengthened by rings of lignin.
Root hair cells which are long extension of an epidermal cell presenting a large surface area in contact with soil solution.

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For protection.
Support and water transport up the plant.
Primary region of light absorption and photosynthesis.
Transport of soluble carbohydrates up and down the plant.
Secondary region of photosynthesis. The air spaces allow for efficient gas exchange.
Controls the sieve tube function.
Controls the opening and closing of the stomata which controls gaseous exchange.
Absorption of water and mineral salts.

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What are examples of body systems?

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Digestive system

Respiratory system

Circulatory system

Kidney

Heart

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What is the function of the red blood cell?

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To transport carbon dioxide around the body.

To transport oxygen around the body.

Tiny cell fragments involved in clotting.

To transport hormones around the body.