Biology - Grade 12 - 2022 G.C
20 . Secretions of endocrine glands require receptors on cell membrane to be picked by their targets while exocrine secretions do not. This is because

  1. exocrine glands secrete hormone directly to the blood stream.
  2. endocrine glands are ductless.
  3. exocrine glands are controlled by the nervous system.
  4. endocrine glands produce protein-based hormones.


21 . Which of the following diseases is caused by a DNA virus?

  1. Cold sore
  2. AIDS
  3. Swine flu
  4. Corona


22 . Currently, natural resources are being depleted at increasing rate and waste materials are accumulated and discharged freely into water bodies. What is the best strategy to overcome these problems?

  1. Decomposition
  2. Succession
  3. Fossilization
  4. Recycling


23 . Which stage of the nitrogen cycle needs the role of Rhizobium?

  1. Decomposition
  2. Denitrification
  3. Nitrogen fixation
  4. Nitrification


24 . A key aspect in the process of recovery of an ecosystem through succession is that

  1. pioneer species always make the environment better.
  2. higher organisms colonize the environment first.
  3. a climax community of lichens and mosses is established at the end.
  4. pioneer species always tend to be lower animals.


We have provided these questions from previous years grade 12 Ethiopian Secondary School Leaving Certificate Examination (ESSLCE) exams with the sole purpose of assisting students in their studies and preparations for upcoming exams. Please be aware that these questions are not indicative of future exam content. Good luck with your studies!

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