Biology - Grade 12 -2023 G.C

Grade 12 students can now access their exam results by visiting the Educational Assessment and Examination Services (EAES) website.


15. About 3 million years ago the Isthmus of Panama separated the shrimp population of the Caribbean Sea and created two populations of shrimps, one on either side of the Isthmus. They still look remarkably similar, but they do not interbreed with each other. Which type of isolation is described by this scenario?

  1. Seasonal isolation
  2. Geographical isolation
  3. Behavioural isolation
  4. Temporal isolation


16. Which one of the following sentences is true about viruses?

  1. AIDS is caused by a DNA virus.
  2. Corona virus is a DNA virus.
  3. Swine flu is caused by an RNA virus.
  4. Herpes simplex is a DNA virus.


17. The following steps are involved when HIV infects its host cell in the human body.
  1. Conversion of viral RNA into DNA and its incorporation into cell's DNA.
  2. Viral DNA's transcription into viral RNA and production of proteins.
  3. Assemblage of new viral particles from RNA, proteins and Reverse Transcriptase
  4. The binding of gp120 of HIV to CD4 of a T-Lymphocyte
  5. Fusion of HIV with the plasma membrane of the host cell
  6. Release of its RNA and reverse transcriptase into the cell.
The logical order of the steps listed above would be

  1. 4,5,6,1,2,3.
  2. 4,2,5,6,1,3.
  3. 4,6,5,2,1,3.
  4. 4,1,2,5,6,3.


18. This item is based on the following diagram which depicts the water cycle.
1
In the above diagram, the letters A,B,C and D respectively represent

  1. evaporation, transpiration, condensation, precipitation.
  2. evaporation, precipitation, transpiration, condensation.
  3. evaporation, transpiration, precipitation, condensation.
  4. evaporation, precipitation, condensation, transpiration.


19. Which one of the following bacteria produces ammonium ion by forming a symbiotic association with peas and beans?

  1. Klebsiella
  2. Azotobacter
  3. Psuedomonas
  4. Rhizobium


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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