Biology - Grade 12 -2022 G.C

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


76. Breakdown of the thick spongy wall of the uterus at the end of the menstrual cycle is associated with the

  1. formation of the corpus luteum.
  2. maturation of the follicle.
  3. decrease in progesterone and estrogen concentration.
  4. increase in oestrogen and progesterone concentration.


77. The first incubation period of HIV is characterized by a duration of

  1. 20 years before all the symptoms appear in well-nourished people.
  2. 2 weeks to produce enough antibodies.
  3. 3-12 weeks when mild symptoms are manifested.
  4. 2-3 years for the progress of infection to AIDS.


78. Which one of the following is a behavioral method of temperature regulation in homoiotherms?

  1. Piloerection
  2. Licking
  3. Aestivation
  4. Vasodilation


79. What will happen if the water content of the blood is too high?

  1. The second coiled tubule of the kidney becomes more permeable.
  2. Antidiuretic hormone secretion decreases.
  3. Osmoreceptors stimulate pituitary gland to release ADH.
  4. The kidney reabsorbs more water back into the blood.


80. The movement of water from the roots up to the top leaves of tall trees is carried out by

  1. loss of water by transpiration and its replacement by osmosis.
  2. active transport in the roots and osmosis in the leaves.
  3. the low cohesive and adhesive forces of water in the xylem.
  4. active transport in both the roots and leaves.


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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