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.


96. In the tropical regions, where there is higher temperature, which one of the following is most likely to take place in the C3 plant's? Rubisco binds with

  1. CO2 to produce glucose and water.
  2. O2 to produce GP and phosphoglycolate.
  3. GP to produce lipid.
  4. H2O to produce TP.

97. During the light-independent reactions of photosynthesis

  1. glucose is directly produced from GP.
  2. RuBP reacts with CO₂ to directly form TP.
  3. some of the GP is used to regenerate RuBP.
  4. GP is reduced to TP by reduced NADP.

98. The suitability of the structural arrangement of a chloroplast in relation to its function can be indicated by the fact that

  1. all pigments are floating around the solution of the stroma.
  2. all pigments in the photosystem are linked to the electron transport chain.
  3. carotenoids are used as a reaction center from which electrons are excited.
  4. the different pigments absorb the same wavelength of light.

99. Which one of the following events occurs during the day time in the CAM photosynthetic pathway?

  1. CO2 reacts with malate.
  2. The stomata open to allow CO2.
  3. CO2 enters into Calvin cycle.
  4. Oxaloacetate is formed.

100. How many turns of the light independent reaction cycle are required to make one molecule of triose phosphate?

  1. 3
  2. 2
  3. 6
  4. 4

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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