Past Paper 2025 11th Class Karachi Board Zoology Subjective

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SECTION “B” (Short Answer Question) Marks: 16

NOTE: Attempt any EIGHT part questions in all. Select FOUR Reasoning Questions and FOUR Non-Reasoning Questions. All part questions carry equal marks.

2.(a) REASONING QUESTIONS:

i) Why kiwi cannot fly?

ii) Why circulatory system of Arthropods is called open type?

iii) Why does each antibody bind only to a specific antigen?

iv) Why blood flow faster in Arteries?

v) Why enzymes are called temperature sensitive?

vi) What are the causes of body's inflammatory response?

vii) Why diploblastic animals are different from the triploblastic?

viii) Why do phospholipids form a bilayer in the cell membrane?

2.(b) NON-REASONING QUESTIONS:

ix) Write different types of RNA.

x) Differentiate Polyp and Medusa Medusa.

xi) What are the inhibitors of enzymes? Explain with examples.

xii) Differentiate Inspiration and Expiration.

xiii) How reptiles are successful in land vertebrate?

xiv) Why electrocardiogram test performed?

xv) Write a note on Lock and Key Model.

xvi) Explain Saturated and Unsaturated acylglycerol.

Section C (Detailed –Answer Question) (16)

NOTE: Attempt any TWO question from this section. All questions carry equal marks.

3. Describe the breathing process in man. Explain the transport of Carbon dioxide and oxygen.

--OR—What are Autoimmune disorder? Explain the role of T-cells and B-cells in transplant rejections.

4. Describe the general characteristics of Class Mammals. Name its sub classes along with distinguishing characteristics with example of each.

5. What is polynucleotide? Define Watson and Crick model of DNA, draw structure of DNA model.

--OR—Explain classification of protein and enlist the structural and functional protein.

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