IGCSE Biology Paper-4: Specimen Questions with Answers 27 - 28 of 279

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Question 27

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What are the main characteristics of living organisms?

Explanation

In living organism there are different properties are present which differ living entities to nonliving object some of them are as follows-

  • Living organisms are made up from two types of cells either prokaryotic or eukaryotic
  • For getting energy living organisms show metabolism process which may be of two types anabolism and catabolism
  • Growth and development occur in all type of living organisms
  • Formation of new generation is done by sexual or asexual reproduction process
  • Living organism gives respond to external stimuli, which can be physical, chemical and biological.
  • Self-regulation of the external environment is found in living organisms
  • Every living organism has a definite life span of birth, growth, maturity and death.

Passage

The transformations that nitrogen undergoes as it moves between the atmosphere, the land and living things make up the nitrogen cycle.

Question 28 (1 of 3 Based on Passage)

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Write the name of some microorganism involve in nitrogen cycle

Explanation

In nitrification- Nitrosomoas and Nitrobacter-

In Denitrification-Pseudomonas spp. , Achromobacter spp. , Paracoccus spp. , Moraxella spp. , Bacillus spp. , Alcaligenes spp. , and Gluconobacter spp

Nitrogen fixation-Rhizobium

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