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.


65. Consider the following figure which demonstrates air movements during breathing using the bell-jar model representing the lung.
1
Which of the following breathing movements happens when air enters into and exits from the balloon lungs?

  1. Air enters when the bell-jar thorax contracts.
  2. Air enters when the rubber sheet is pushed up.
  3. Air exits when Y-piece is rotated both clock wise and counter - clockwise.
  4. Air exits when the balloon lungs have higher pressure than the external environment.


66. Which one of the following sentences explains the traditional use of biotechnology? Production of

  1. insulin using transgenic bacteria
  2. dairy products at household level
  3. myco-proteins under a laboratory
  4. vinegar using industrial fermenter


67. Which one of the following sentences is correct about mitosis? It

  1. is the division of sex cells resulting in identical daughter cells.
  2. produces four different daughter cells from a single cell.
  3. is the division of somatic cells to make identical daughter cells.
  4. produces half number of chromosomes from the original cell.


68. Consider the following diagram showing blood circulation system in the human body.
1
In the above diagram, the parts indicated by numbers 1, 2, 3 and 4, are respectively

  1. aorta, vena cava, pulmonary vein, pulmonary artery.
  2. pulmonary artery, pulmonary vein, vena cava, aorta.
  3. pulmonary vein, aorta, vena cava, pulmonary artery.
  4. vena cava, pulmonary artery, aorta, pulmonary vein.


69. A cross between pea plants having heterozygous genotype (Rr) has been made. Which of the following is correct about the offspring according to the Mendelian inheritance? The genotypic probability of getting

  1. Rr is 25%.
  2. Rr is 75%.
  3. RR is 50%.
  4. rr is 25%.


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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