Karnataka 1st PUC Biology Chapter 15 Body Fluids and Circulation Important Questions

Body Fluids and Circulation is an important chapter in Karnataka 1st PUC Biology. It explains the composition and functions of blood, lymph, the structure of the human heart and the process of circulation. Students may find it challenging to remember the functions of blood components and understand the different stages of the cardiac cycle.

Practising Karnataka 1st PUC Biology Chapter 15 Important Questions can help students revise these concepts and prepare descriptive answers. Before starting revision, check the Karnataka Class 11 Biology syllabus to understand the prescribed topics. The questions below cover blood groups, blood coagulation, the human heart, double circulation and cardiac activity.

Important Questions on Body Fluids and Circulation

Practise the following questions to revise the key concepts of Chapter 15 and improve your understanding of the topic.

1. Heart pumps blood more forcefully in older persons than younger ones due to

(A) Decrease in oxygen content of blood
(B) Decrease in elasticity of arteries
(C) Fall in nutrient content of blood
(D) Increase in elasticity of arteries

2. Which of the following statements are incorrect?

(i) Leucocytes disintegrate in spleen and liver.
(ii) RBCs, WBCs and blood platelets are produced by bone marrow.
(iii) Neutrophils bring about destruction and detoxification of toxins of protein origin.
(iv) An important function of lymphocytes is to produce antibodies.

(A) (i) and (ii)
(B) (i) and (iv)
(C) (i) and (iii)
(D) (ii) and (iii)

3. The correct route through which pulse-making impulse travels in the heart is

(A) SA node → Purkinje fibres → Bundle of His → AV node → Heart muscles
(B) SA node → AV node → Bundle of His → Purkinje fibres → Heart muscles
(C) AV node → Bundle of His → SA node → Purkinje fibres → Heart muscles
(D) AV node → SA node → Purkinje fibres → Bundle of His → Heart muscles

4. Which of the following is correct about human heart?

(A) The volume of both atria > the volume of both ventricles

(B) The volume of both ventricles > the volume of both atria

(C) The volume of both atria = the volume of both ventricles

(D) Ventricles are upper chambers and atria are lower chambers in our heart

These Body Fluids and Circulation 1st PUC Biology Important Questions cover major concepts from the chapter. While preparing, revise the functions of red blood cells, white blood cells and platelets. Also understand blood groups, blood coagulation, the cardiac cycle and the pathway of blood circulation.

Karnataka 1st PUC Biology Chapter 15 Important Questions PDF

Students can refer to the official 2026–27 Biology chapter Body Fluids and Circulation to support their preparation. The PDF provides the important questions from Karnataka 1st PUC Biology Chapter 15 for revision. You can also practise using the Karnataka 1st PUC Biology model question paper to become familiar with the question format:

How to Prepare for Karnataka 1st PUC Biology Chapter 15

To prepare effectively for Body Fluids and Circulation, focus on understanding biological processes and revising important definitions, diagrams and differences. Follow these steps during your preparation:

• Understand the composition and functions of blood, including plasma and formed elements.

• Revise blood groups, blood coagulation and the functions of lymph.

• Practise drawing and labelling the structure of the human heart.

• Understand the cardiac cycle, heartbeat and double circulation.

• Refer to the Karnataka PUC 1 syllabus to review syllabus-related information.

• Solve the Karnataka 1st PUC mid-term question papers with answer keys for additional practice.

• Check the Karnataka 1st PUC exam pattern  to understand the examination structure and prepare accordingly.

Practising Karnataka 1st PUC Biology Chapter 15 Important Questions helps students revise blood components, heart structure and circulation. 

Focus on understanding key concepts, practising labelled diagrams and solving MCQs and descriptive questions. Refer to the official chapter PDF, syllabus and model papers for organised revision and better examination preparation.