Biology - 4BI1 PearsonEdexcel

Characteristics Of Living Organisms

Muhtasari

What separates a living cat from a stone? Both are made of atoms, yet the cat breathes, grows and responds to the world around it. Biologists have identified eight processes that every living organism carries out, and recognising them is the first step toward understanding the rest of the course.

In this lesson you will learn each of the eight life processes, explore how they apply to both plants and animals, and practise using the mnemonic MRS C GREN to recall them quickly under exam conditions.

Malengo

  1. Understand how living organisms share the following characteristics: they require nutrition, they respire, they excrete their waste, they respond to their surroundings, they move, they control their internal conditions, they reproduce, they grow and develop

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Maelezo ya Somo

Deciding whether something is alive is not as simple as it sounds. A river moves, a fire grows, and crystals can seem to reproduce, yet none of these is living. Biologists agree that a living organism must carry out all eight of the following life processes. Missing even one means the object is either dead or was never alive.

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  1. Which of the following is NOT one of the eight characteristics of living organisms? A) Respiration B) Photosynthesis C) Excretion D) Reproduction Answer: B
  2. What does the letter 'S' stand for in the mnemonic MRS C GREN? A) Synthesis B) Sensitivity C) Secretion D) Selection Answer: B
  3. Which of the following best describes excretion? A) Removal of undigested food from the gut B) Removal of toxic waste products from metabolic reactions C) The breakdown of food molecules in the stomach D) The absorption of nutrients into the blood Answer: B
  4. Why are viruses not classified as living organisms? A) They are too small B) They do not carry out all eight life processes independently C) They do not contain any genetic material D) They can only be seen with a microscope Answer: B
  5. A green plant makes its own food by photosynthesis. What term describes this type of nutrition? A) Heterotrophic B) Saprotrophic C) Autotrophic D) Parasitic Answer: C

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Vitabu Vinavyopendekezwa

Pearson Edexcel International GCSE (9-1) Biology Student Book
Pearson Edexcel International GCSE (9-1) Biology Student Book
Manukuu: First edition
Mchapishaji: Pearson Education
Mwaka: 2017
ISBN: 978-0-435-18426-5
Maelezo: Endorsed student book covering the full 4BI1 specification.

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