9th Class Biology Past Paper 2024 Evening
Note: Biology 2nd Time Paper of 9th Class.
Group-II (Subjective) 48 Marks
Part– I
Q.2 Write short answers to any FIVE (5) questions: (10)
(i) List any four careers associated with biology.
(ii) What can you say about species?
(iii) Write the names of vegetative organs of a plant.
(iv) Define science.
(v) Write the steps in solving a biological problem.
(vi) What would happen if the Quina Quina tree was not discovered?
(vii) Write down two functions of cytoplasm.
(viii) Differentiate between resolution and magnification.
Q.3 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Write down the aims of classification.
(ii) Mention the significance of binomial nomenclature in scientific communication.
(iii) Why is a species called endangered? Give two examples of endangered species of Pakistan.
(iv) Why is crossing over during meiosis essential for genetic diversity?
(v) How does cell replacement occur in living organisms?
(vi) How do benign tumors differ from malignant tumors?
(vii) What is glycolysis? Where does it take place in the cell?
(viii) How does temperature affect the rate of photosynthesis?
Q.4 Write short answers to any FIVE (5) questions: (10 Marks)
(i) How do enzymes lower the activation energy?
(ii) Differentiate between the “lock and key model” and the “induced fit model.”
(iii) Write the sources of vitamin A.
(iv) What is the role of sodium in the human body?
(v) How is rhodopsin formed?
(vi) How can plasma be separated from blood?
(vii) Which structures are involved in transpiration in plants?
(viii) What are the risk factors that lead to cardiovascular disorders?
PART-II
Note: Attempt any TWO (2) questions.
Q.5
(a) Explain the organ and organ system levels. (5 Marks)
(b) Define transpiration. Write the factors affecting the rate of transpiration. (4 Marks)
Q.6
(a) Identify the causes of deforestation and its effects on biodiversity. (5 Marks)
(b) Explain the mechanism of respiration while defining glycolysis, the Krebs cycle, and the electron transport chain. (4 Marks)
Q.7
(a) What do you know about compound tissues? Explain each kind of compound tissue. (5 Marks)
(b) How does vitamin A affect human health? (4 Marks)