Science Double Award - 4SD0 PearsonEdexcel

Level Of Organisation

Akopọ

A single cell is remarkable, but a human body contains roughly 37 trillion of them. How do trillions of cells work together to form something as complex as a person? The answer lies in levels of organisation: cells group into tissues, tissues into organs, and organs into systems, each level adding a new layer of coordination.

In this lesson you will trace the hierarchy from organelles inside a single cell all the way up to complete organ systems in animals and plants. Understanding this framework helps you connect every later biology topic, from digestion to gas exchange, to the structures that carry them out.

Awọn Afojusun

  1. Describe the levels of organisation in organisms: organelles, cells, tissues, organs and systems

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Akọ̀wé Ẹ̀kọ́

Your heart is not just a lump of muscle. It is a precisely engineered organ built from layers of specialised tissues, each tissue made from cells that share the same structure and function. Inside every one of those cells, tiny organelles carry out the chemical work that keeps you alive. This hierarchy, from the smallest organelle to the whole organism, is how multicellular life achieves complexity without chaos.

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Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.

Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.

  1. Which is the correct order from smallest to largest? A) Cell, tissue, organ, organelle, organ system B) Organelle, cell, tissue, organ, organ system C) Organ, tissue, cell, organelle, organ system D) Organelle, cell, organ, tissue, organ system Answer: B
  2. A group of similar cells working together to perform one function is called: A) An organ B) An organ system C) A tissue D) An organelle Answer: C
  3. Which of the following is an organ? A) A mitochondrion B) The digestive system C) Muscle tissue D) The heart Answer: D
  4. In a plant, which tissue is mainly responsible for photosynthesis? A) Xylem B) Phloem C) Palisade mesophyll D) Epidermis Answer: C
  5. Which organelle is the site of aerobic respiration? A) Ribosome B) Nucleus C) Chloroplast D) Mitochondrion Answer: D

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