Tamil Nadu Class 11 Zoology Chapter 4 Organ and Organ Systems in Animals Solutions

Tamil Nadu Class 11 Zoology Chapter 4, Organ and Organ Systems in Animals, explains the structure, functions and organisation of different organs in animals. The chapter covers the morphology and anatomy of earthworms, cockroaches, frogs and pigeons. Students need to understand their digestive, respiratory, circulatory, excretory, nervous and reproductive systems.

Practising TN 11th Biology Organ and Organ Systems in Animals Chapter 4 Questions and Answers can help you understand these concepts and prepare for different question formats in the public examination. The solutions also help you check your answers and revise important textbook topics.

Tamil Nadu Class 11 Zoology Chapter 4 Book Back Solutions PDF Download

Students can use the Tamil Nadu Class 11 Biology Chapter 4 Organ and Organ Systems in Animals Book Back Solutions PDF to practise questions from the prescribed textbook. The exercise includes multiple-choice questions and other questions based on animal morphology and organ systems.

The following solutions cover the questions shared from the Chapter 4 exercise:

Practise the questions after reading the textbook chapter. Students can also refer to the Tamil Nadu Class 11 Zoology syllabus to check the prescribed topics and plan their revision.

TN 11th Biology Organ and Organ Systems in Animals Chapter 4 Questions and Answers

The following multiple-choice questions cover important facts about earthworms and cockroaches. Practise them to check your understanding of the chapter:

I. Choose the Correct Answer

1. Clitellum in Lampito mauritii is found in:

(A) 13–14

(B) 14–17

(C) 12–13

(D) 14–16

Answer: (B) 14–17

The clitellum in Lampito mauritii is present in segments 14–17. It plays an important role in reproduction and cocoon formation.

2. Sexually, earthworms are:

(A) Sexes separate

(B) Hermaphroditic but not self-fertilising

(C) Hermaphroditic and self-fertilising

(D) Parthenogenic

Answer: (B) Hermaphroditic but not self-fertilising

Earthworms are hermaphrodites, which means an individual has both male and female reproductive organs. However, they generally reproduce through cross-fertilisation.

3. The two ends of the earthworm can equally ingest soil. True or false?

(A) True

(B) False

(C) Both true and false

(D) Cannot be determined

Answer: (B) False

Food enters the earthworm's body through the mouth at the anterior end. The posterior end has the anus, through which undigested matter is expelled.

4. Cockroach head has pairs of ______ and ______ shaped eyes.

(A) Sessile compound eyes; kidney-shaped

(B) Simple eyes; spherical

(C) Compound eyes; oval-shaped

(D) Simple eyes; kidney-shaped

Answer: (A) Sessile compound eyes; kidney-shaped

A cockroach has a pair of sessile compound eyes on its head. These eyes are kidney-shaped and help it detect movement and changes in its surroundings.

5. Location and number of Malpighian tubules in Periplaneta:

(A) Foregut and midgut; 100

(B) Midgut and hindgut; 150

(C) Hindgut and rectum; 200

(D) Midgut and foregut; 150

Answer: (B) Midgut and hindgut; 150

Cockroaches have approximately 100–150 Malpighian tubules located at the junction of the midgut and hindgut. These tubules help remove nitrogenous waste from the body.

How to Prepare for Tamil Nadu Class 11 Zoology Chapter 4?

Chapter 4 includes several anatomical structures, biological terms and organ systems. Follow these preparation tips to revise the topics effectively:

1. Study each animal separately: Begin with earthworms, cockroaches, frogs and pigeons. Understand their external features before moving to internal anatomy.

2. Learn the organ systems: Revise the digestive, respiratory, circulatory, excretory, nervous and reproductive systems of the animals covered in the chapter.

3. Practise labelled diagrams: Draw important anatomical diagrams and label the major organs correctly.

4. Make comparison tables: Compare the organ systems of earthworms, cockroaches and frogs to remember their similarities and differences.

5. Solve book back questions: Practise all textbook exercises and use the solutions to check your answers.

6. Revise important terms: Remember biological terms such as clitellum, Malpighian tubules and hermaphroditism, along with their functions.

7. Solve previous year papers: Practise the Tamil Nadu Class 11 Zoology Previous Year Question Papers and Tamil Nadu HSE+1 Previous Year Question Papers to understand the question formats.

8. Check the examination pattern: Refer to the Tamil Nadu Class 11 Exam Pattern and HSE+1 grading and marking details to plan your preparation.

9. Plan your revision: Check the Tamil Nadu HSE+1 First Table and divide your revision time across the chapters.

Benefits of Using Tamil Nadu Class 11 Biology Chapter 4 Solutions

Using textbook solutions while studying can help you understand difficult concepts and improve your preparation.

1. Clear understanding: Solutions explain important concepts related to the structure and functions of animal organs.

2. Better revision: You can quickly revise important biological terms, anatomical structures and organ systems.

3. Answer-writing practice: Solving textbook questions helps you organise your answers and include relevant points.

4. Diagram preparation: Revising anatomical diagrams helps you understand the location and function of different organs.

5. Self-assessment: Comparing your answers with the solutions helps you identify topics that need more revision.

Tamil Nadu Class 11 Zoology Chapter 4, Organ and Organ Systems in Animals, helps students understand the morphology and anatomy of different animals. Focus on the important organ systems, anatomical structures and biological terms while preparing this chapter. 

Practising the 11th Biology Organ and Organ Systems in Animals Book Back Question Answers PDF Download, along with textbook exercises and previous year papers, can help you revise the concepts and improve your answer-writing skills.