Ethiopian Entrance Exam Preparation OroLingo · Grade 9–12 Tutorials & Study Resources

1. Which organelle is the main site of aerobic respiration in a typical eukaryotic cell?

   A. Ribosome · B. Mitochondrion · C. Nucleus · D. Golgi apparatus

   Answer: B. Mitochondria carry out key stages of aerobic respiration, producing much of the cell’s ATP. Ribosomes make proteins.

2. A plant cell is placed in a dilute solution with a higher water potential than its contents. What is the net movement of water?

   A. Into the cell · B. Out of the cell · C. No movement · D. Only through the cell wall, never the membrane

   Answer: A. Water moves into the cell by osmosis across its selectively permeable membrane. The rigid cell wall helps prevent the cell from bursting as it becomes turgid.

3. In a simple dominant–recessive model, two heterozygous parents (Aa × Aa) have offspring. What is the probability of the recessive phenotype?

   A. 0% · B. 25% · C. 50% · D. 75%

   Answer: B. The possible allele combinations are AA, Aa, Aa and aa. One of four combinations is aa, so the probability is 1/4, or 25%.

After checking: write one sentence explaining each mistake, then review the corresponding biology lesson.

Find a biology video lesson →

1. Solve x² − 5x + 6 = 0.

   Find two numbers whose product is 6 and sum is −5: −2 and −3. Factor to get (x − 2)(x − 3) = 0. Therefore x = 2 or x = 3. Substitute either value into the original equation to check.

2. A fair six-sided die is rolled once. What is the probability of a multiple of 3?

   The favourable outcomes are 3 and 6: two outcomes out of six equally likely outcomes. Probability = 2/6 = 1/3. Count outcomes before simplifying the fraction.

3. If f(x) = 3x² − 4x + 1, find f′(2).

   Differentiate each term: f′(x) = 6x − 4. Then substitute x = 2: 6(2) − 4 = 8. This is the gradient of the curve at x = 2.

After checking: classify each error as a concept, calculation or reading mistake. Redo the question without looking at the solution.

Continue to exam practice →

1. Day 1: Attempt a short set of questions. List three topics that need work.
2. Days 2–4: Focus on one of those topics each day. Review a lesson, close your notes, explain the idea in your own words, then practise questions.
3. Day 5: Mix questions from all three topics. Check whether you can choose the right method without a topic label.
4. Day 6: Try a timed practice set. Review the questions you missed or guessed.
5. Day 7: Reattempt mistakes, plan the next week, and allow time for rest.

Example 60-minute session: 15 minutes reviewing one concept, 25 minutes answering questions, 15 minutes correcting them, and 5 minutes choosing the next topic. Adjust the time to your schoolwork and available energy.

Keep an error log with the question, what went wrong, the correct method, and a date to try it again.

Organise your week in the study planner →