Biology (9-1) - 0970 CIE

Characteristics Of Living Organisms

Gbogbo ọrọ náà

How do you tell something that is alive from something that is not? A rock and a mushroom, a candle flame and a cell: each pair can look similar at a glance, yet only one of each is truly living. Biologists settle the question with a checklist of seven life processes that every living organism, from a single bacterium to a blue whale, carries out.

In this lesson you will learn those seven characteristics and the precise definition of each, captured by the well known memory aid MRS GREN. By the end you will be able to define every process in exam language and decide, with reasons, whether any given thing counts as a living organism.

Ebumnobi

  1. Describe the characteristics of living organisms by describing: (a) movement as an action by an organism or part of an organism causing a change of position or place (b) respiration as the chemical reactions in cells that break down nutrient molecules and release energy for metabolism (c) sensitivity as the ability to detect and respond to changes in the internal or external environment (d) growth as a permanent increase in size and dry mass (e) reproduction as the processes that make more of the same kind of organism (f) excretion as the removal of the waste products of metabolism and substances in excess of requirements (g) nutrition as the taking in of materials for energy, growth and development

Nkuzi Olu

Gee ntị na nkuzi a na ngwa

Maapụ uche

E seela isiokwu a ka ị hụ otu echiche si ejikọta.

Mepee maapụ uche na ngwa

Kaadị ncheta

Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.

Mee omume kaadị ndị a na ngwa

Akwụkwọ Ọmụmụ

Every other chapter in biology builds on one idea: a living organism is a thing that performs certain processes. Get these seven definitions exact and you can earn easy marks, recognise life in unfamiliar examples, and understand why a virus sits awkwardly on the boundary between living and non-living. Examiners ask for these definitions word for word, so precision pays.

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Nnyocha Ọmụmụ

Ekele diri gi maka imecha ihe karịrị na Characteristics Of Living Organisms. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

  1. In the mnemonic MRS GREN, what does the letter N stand for? A. nutrition B. nervousness C. nitrogen D. nutrients Answer: A
  2. Which process is defined as a permanent increase in size and dry mass? A. respiration B. growth C. excretion D. nutrition Answer: B
  3. Removal of undigested food from the gut is called: A. excretion B. egestion C. secretion D. respiration Answer: B
  4. Which characteristic is the ability to detect and respond to changes in the environment? A. movement B. sensitivity C. reproduction D. nutrition Answer: B
  5. Respiration is best described as: A. breathing air in and out B. chemical reactions in cells that release energy from nutrients C. taking in food D. removing carbon dioxide only Answer: B

Rue ajuju ndi a n'ime ngwa ahu

Rue ajuju ndi a n'ime ngwa ahu

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