Science Double Award - 4SD0 PearsonEdexcel

Variety Of Living Organisms

Gbogbo ọrọ náà

Life on Earth ranges from microscopic bacteria that thrive in boiling hot springs to giant redwood trees that stand for thousands of years. Biologists organise this staggering diversity into groups based on shared features, splitting organisms into eukaryotes and prokaryotes and then asking which ones cause disease.

In this lesson you will compare the four eukaryotic kingdoms (animals, plants, fungi and protoctists), explore how prokaryotic bacteria differ from them, and learn what makes an organism a pathogen. These distinctions appear throughout the biology section of the Double Award and form the foundation for topics on cells, disease and ecology.

Ebumnobi

  1. Describe the common features shown by eukaryotic organisms: plants, animals, fungi and protoctists
  2. Describe the common features shown by prokaryotic organisms such as bacteria
  3. Understand the term pathogen and know that pathogens may include fungi, bacteria, protoctists and viruses

Maapụ uche

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Akwụkwọ Ọmụmụ

Walk through a forest and you will pass animals, plants, fungi growing on dead logs, and invisible protoctists in every puddle. All of them are built from eukaryotic cells with a membrane-bound nucleus. Meanwhile, bacteria in the soil beneath your feet belong to an entirely different cell plan: prokaryotic, smaller, and lacking a true nucleus. Sorting life into these groups is not just an academic exercise; it determines how we diagnose disease, develop antibiotics, and protect crops.

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Nnyocha Ọmụmụ

Ekele diri gi maka imecha ihe karịrị na Variety 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. Which kingdom contains organisms with cell walls made of chitin? A) Plants B) Animals C) Fungi D) Prokaryotes Answer: C
  2. What is the main difference between eukaryotic and prokaryotic cells? A) Prokaryotic cells have a cell wall B) Eukaryotic cells have a membrane-bound nucleus C) Prokaryotic cells are always multicellular D) Eukaryotic cells have no DNA Answer: B
  3. Which of these is a protoctist? A) Yeast B) Lactobacillus C) Plasmodium D) Mushroom Answer: C
  4. Bacteria have genetic material in the form of: A) Linear chromosomes inside a nucleus B) A circular chromosome in the cytoplasm C) RNA only, with no DNA D) DNA inside mitochondria Answer: B
  5. Which statement about pathogens is correct? A) All bacteria are pathogens B) Viruses can only reproduce inside living cells C) Fungi never cause disease D) Protoctists are always beneficial Answer: B

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