9th Class Biology Past Paper 2023 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) Define bioeconomics.
(ii) State Bu Ali Sina’s achievements in biology.
(iii) What is the biosphere level?
(iv) Define the scientific method.
(v) Write two characteristics of a hypothesis.
(vi) Define the incubation period.
(vii) Differentiate between sieve tube cells and companion cells.
(viii) Define active transport.
Q.3 Write short answers to any FIVE (5) questions: (10 Marks)
(i) Define systematics.
(ii) Write two aims of classification.
(iii) Differentiate between karyokinesis and cytokinesis.
(iv) How is phragmoplast formed in plant cells?
(v) How does mitosis help in the replacement of body cells?
(vi) How does temperature affect photosynthesis?
(vii) Why is it incorrect to say that the energy-releasing step of respiration is the electron transport chain?
(viii) What is meant by tetrad formation?
Q.4 Write short answers to any FIVE (5) questions: (10 Marks)
(i) How are enzymes used as biological detergents?
(ii) What does saturation of active sites mean?
(iii) Define the “Lock & Key Model” of enzyme action.
(iv) Why is vitamin C important?
(v) Define peristalsis.
(vi) What is the “Cohesion-Tension Theory”?
(vii) Define arteries and veins.
(viii) Write the effects of dengue fever on platelets.
PART-II
Note: Attempt any TWO (2) questions.
Q.5
(a) Define biology and write a note on the Golgi apparatus and lysosome. (5 Marks)
(b) Explain its three main domains. (4 Marks)
Q.6
(a) Define endangered species and discuss any three types of endangered species in Pakistan. (5 Marks)
(b) Write a note on aerobic and anaerobic respiration. (4 Marks)
Q.7
(a) Describe complete digestion in the small intestine. (5 Marks)
(b) Write a detailed note on blood plasma. (4 Marks)