CBSE Class 11 Biology Chapter 7 Structural Organisation in Animals Worksheet with Answers

Chapter 7 in the NCERT Class 11 Biology textbook introduces students to the structural complexity of multicellular animals. Unlike plants, animal tissues are grouped into four major categories based on structure and function. Epithelial tissue forms protective coverings and linings; connective tissue binds and supports other tissues; muscular tissue enables movement; and nervous tissue coordinates body functions through electrical impulses. The chapter uses the cockroach (Periplaneta americana) as a model organism to demonstrate organ-level organisation, detailing its external morphology (head, thorax, abdomen), digestive system (alimentary canal with hepatic caeca), circulatory system (open type with haemolymph), respiratory system (tracheal network with spiracles), nervous system (ventral nerve cord with ganglia), excretory system (Malpighian tubules) and reproductive system (sexual dimorphism with ovipositor in females). Understanding these structures is critical for comparing invertebrate and vertebrate organisation in later chapters.

This worksheet is designed for a focused 90-minute practice session, suitable for self-assessment or classroom tests. It contains over forty questions distributed across five sections of increasing difficulty. Section A tests conceptual recall through multiple-choice questions. Section B reinforces terminology with fill-in-the-blank statements. Section C checks understanding of relationships through matching or true-false items. Section D requires short explanatory answers, typically 2-3 marks each in board exams. Section E presents long-answer and higher-order thinking skill (HOTS) questions worth 5 marks, demanding integration of concepts and diagram-based explanations. A case-study question mirrors the competency-based format introduced in recent CBSE papers. The complete answer key at the end includes not just correct answers but also concise explanations, helping students self-correct and understand mistakes. Students should attempt the worksheet under timed conditions, then review answers critically to identify weak areas.

This section contains six multiple-choice questions testing factual recall and conceptual understanding of animal tissues and cockroach anatomy. Each question has four options with only one correct answer. These mirror the objective-type questions that typically appear in CBSE Class 11 Biology term exams and are also good practice for competitive exams like NEET. Students should read each option carefully, as distractors are designed to test common misconceptions (for example, confusing skeletal and cardiac muscle properties, or mixing up digestive system regions). Attempting these questions first builds confidence and ensures quick marks in actual exams. Pay special attention to terminology used in NCERT — for instance, 'haemocoel' not 'blood cavity', 'Malpighian tubules' not 'kidney tubules', 'uricotelic' not 'urea-excreting'. Mark your answers clearly and avoid changing responses unless you are certain of an error.

Section B presents seven fill-in-the-blank statements that reinforce precise NCERT terminology. Answers must be exact as per the textbook to earn full marks. This section tests retention of specific names, numbers and technical terms such as tissue types, anatomical structures and physiological processes. Common errors include spelling mistakes (e.g. writing 'haemocoel' as 'hemocoel', though both are acceptable, NCERT uses British spelling), incorrect counts (e.g. number of spiracles or abdominal segments) and confusing similar terms (e.g. ganglia vs. ganglion, thorax vs. abdomen). When practising, write answers neatly in the blanks provided. If unsure, leave blank rather than guessing wildly — negative marking is rare in descriptive sections but wrong answers reflect conceptual gaps. After completing, cross-check every answer against NCERT Class 11 Biology Chapter 7 text and diagrams. This section is particularly helpful for board exam preparation where 1-mark definitional questions are common.

Section C offers a matching exercise where students connect terms in Column A with their descriptions or examples in Column B. This format tests relational understanding — can you link a tissue type to its location, a structure to its function, or an organ system to its component? Each correct match earns one mark. Students should draw clear lines or write answer pairs (e.g. A-3, B-1) to avoid ambiguity. Matching questions are popular in CBSE Class 11 Biology because they assess breadth of knowledge efficiently. When practising, first match the items you are certain about, then use elimination for the rest. Pay attention to subtle differences: for example, 'haemolymph' vs. 'blood', 'striated voluntary' vs. 'striated involuntary', or 'simple epithelium' vs. 'compound epithelium'. This section also prepares you for diagram-based labelling where you must match labels to parts of a cockroach diagram in practicals or theory exams. After attempting, verify each pair against NCERT definitions to reinforce correct associations.

Section D comprises five short-answer questions, each requiring concise explanations of 30-50 words or a simple labelled diagram. These questions typically carry 2 or 3 marks in CBSE exams and test your ability to articulate concepts clearly. Focus on using correct terminology from NCERT Class 11 Biology and structuring answers in points for clarity. For instance, when asked to differentiate between two tissue types, present the answer in a two-column table or bullet points highlighting 2-3 differences. When describing a structure, mention its location, composition and function. Diagrams, if asked, should be neat with clear labelling lines drawn with a ruler and labels written in pencil. Avoid long paragraphs; examiners appreciate brevity and precision. Practice writing answers within the word limit to develop exam discipline. These questions form the backbone of the theory paper, so thorough preparation here directly impacts your overall score.

Section E contains three long-answer questions, each worth 5 marks, demanding comprehensive explanations, diagrams or application of concepts to novel situations. These questions test deeper understanding and the ability to synthesise information from multiple sections of the chapter. A typical 5-mark answer should be 100-150 words or include a detailed labelled diagram plus explanation. Structure your response with an introduction, 3-4 main points and a brief conclusion if appropriate. Use subheadings or bullet points for clarity. Higher-order thinking skill (HOTS) questions might ask you to compare cockroach and earthworm anatomy, predict the effect of blocking spiracles, or explain evolutionary advantages of open vs. closed circulatory systems. Such questions assess critical thinking beyond rote learning. CBSETUTOR.ai offers 24×7 AI-powered tutoring where students can upload photos of tricky HOTS questions and receive step-by-step solutions, available for all classes 6-12 at a flat ₹999/month with a 3-day free trial — a shift for late-night revision when doubt-solving is otherwise impossible.

The case-study question is a competency-based format introduced in recent CBSE exams. It presents a short passage describing a real-world or experimental scenario related to Chapter 7 concepts, followed by 3-4 sub-questions. This format assesses your ability to apply textbook knowledge to interpret data, draw inferences and solve problems. Read the passage carefully, underline key terms and refer back to it while answering sub-questions. Answers should be precise, directly addressing what is asked. For instance, a passage might describe an experiment observing cockroach behaviour after blocking certain spiracles, then ask you to predict oxygen delivery changes and survival outcomes. Such questions reward analytical thinking and familiarity with NCERT experimental contexts. They also prepare students for higher education where application trumps recall. Practice multiple case studies from sample papers and previous years' CBSE questions to build confidence in this format.

The answer key below provides correct responses for all questions along with brief explanations. Use this section for self-assessment after attempting the worksheet. Do not peek at answers before completing your attempt — honest practice reveals true preparation levels. For each incorrect answer, revisit the relevant NCERT section and make notes. Pay special attention to recurring errors; these indicate concepts needing deeper revision. When checking diagram-based answers, compare labelling and neatness against NCERT figures. If your answer is partially correct, award partial marks honestly to gauge your score accurately. This answer key is structured to support independent learning, but for personalised doubt-clearing and step-by-step solutions with diagram explanations, CBSETUTOR.ai offers an AI tutor available around the clock. Students can photograph handwritten answers or tricky questions and receive instant, curriculum-aligned feedback — all for just ₹999 per month across classes 6-12, with a 3-day free trial to explore the platform risk-free.

**Q1. (b) Squamous epithelium** — The inner lining of blood vessels (endothelium) is made of simple squamous epithelium, which allows easy diffusion of substances. **Q2. (a) Foregut** — The gizzard is part of the foregut in cockroach, located after the crop; it has teeth for grinding food. **Q3. (c) Conduction of nerve impulses** — Nerve impulse conduction is the function of nervous tissue, not connective tissue. Connective tissue binds, supports, transports and stores. **Q4. (c) Uric acid** — Cockroaches are uricotelic; they excrete nitrogenous waste as uric acid via Malpighian tubules, conserving water. **Q5. (c) Involuntary and branched** — Cardiac muscle is striated, involuntary and has branched fibres with intercalated discs for coordinated contraction. **Q6. (a) Valves called ostia** — Blood (haemolymph) from sinuses enters the heart through small valves called ostia located on the lateral sides of the heart chambers. **Q7. (b) Schwann cells** — In the peripheral nervous system, Schwann cells wrap around axons to form the myelin sheath. In the CNS, oligodendrocytes perform this function.

**Section B (Fill in the Blanks):** **Q8.** adipose tissue **Q9.** six **Q10.** tracheae, spiracles (or tracheal tubes and spiracles) **Q11.** motor (or efferent) **Q12.** Malpighian tubules **Q13.** calcium (or calcium phosphate) **Q14.** ovipositor **Section C (Match the Following):** **Q15.** (A)–3, (B)–2, (C)–1, (D)–4, (E)–5 **Q16. True/False:** (a) False. Cockroach has an open circulatory system with haemocoel. (b) True. (c) False. Ligaments connect bone to bone; tendons connect muscle to bone. (d) True. (e) False. Schwann cells form myelin in the peripheral nervous system; oligodendrocytes do so in the central nervous system. **Section D (Short Answers):** **Q17.** Striated muscle has striations (light and dark bands), is voluntary and found in skeletal muscles. Smooth muscle lacks striations, is involuntary and found in internal organs like the stomach and intestine. **Q18.** Diagram should show: cell body (cyton) with nucleus, dendrites (short branched processes receiving impulses), axon (long process transmitting impulses), myelin sheath, nodes of Ranvier and axon terminals. Labels must be clear and lines ruled. **Q19.** Areolar tissue is a loose connective tissue found between skin and muscles, around blood vessels and nerves. It consists of fibroblasts, collagen fibres, elastic fibres and a semi-fluid matrix. It supports, repairs and fills spaces. **Q20.** The cockroach digestive system has three regions: foregut (mouth, oesophagus, crop for storage, gizzard for grinding), midgut (with hepatic caeca for enzyme secretion, site of digestion and absorption) and hindgut (ileum, colon, rectum for water absorption). **Q21.** Based on layers: simple (one layer, e.g. lining of blood vessels) and compound/stratified (multiple layers, e.g. skin). Based on shape: squamous (flat, e.g. alveoli), cuboidal (cube-like, e.g. kidney tubules), columnar (tall, e.g. intestine lining). **Section E (Long Answers):** **Q22.** Connective tissues include: (i) Loose connective tissue — areolar (binds organs, fills spaces), adipose (stores fat, insulation). (ii) Dense connective tissue — tendons (muscle to bone), ligaments (bone to bone). (iii) Specialised connective tissue — cartilage (flexible support in nose, ear), bone (rigid support, protection), blood (transport of gases, nutrients). Each type has cells embedded in an extracellular matrix varying in composition and consistency. **Q23.** Diagram: supra-oesophageal ganglion (brain) above oesophagus, sub-oesophageal ganglion below, ventral nerve cord running along ventral side with segmental ganglia in thorax and abdomen. The nervous system coordinates sensory input from antennae and compound eyes, and motor output to legs and wings. **Q24.** Circulatory: Open system with haemolymph filling haemocoel; heart is 13-chambered dorsal vessel pumping blood forward; blood does not flow in closed vessels. Respiratory: Tracheal system with ten pairs of spiracles opening into tracheal tubes delivering oxygen directly to tissues; no role of blood in oxygen transport. Open circulation suits slow-moving insects; tracheal system efficiently supplies oxygen independent of circulation. **Section F (Case Study):** (a) Simple columnar epithelium. (b) Nuclei are located at the base because the apical part contains secretory granules or mucus, pushing nuclei basally. (c) Modification: microvilli (brush border). Function: increases surface area for absorption of digested nutrients in the intestine.

Print this worksheet and attempt it under exam-like conditions: set a timer for 90 minutes, keep your NCERT textbook and notes aside, and work through all sections sequentially. This simulates real exam pressure and helps you manage time effectively across different question types. After completing, take a 10-minute break before starting the self-assessment using the answer key. Mark each answer strictly, noting not just wrong answers but also incomplete or poorly worded responses. Calculate your total score and identify patterns — are you weak in tissue classification, cockroach morphology or diagram labelling? Revisit those NCERT sections immediately, making concise notes summarising key points and diagrams. Reattempt only the incorrect questions after 48 hours to check if concepts have been retained. For students struggling with diagram-based questions or needing instant clarifications on HOTS questions, platforms like CBSETUTOR.ai provide AI-driven, personalised help at any hour. Regular worksheet practice, combined with NCERT reading and smart doubt resolution, builds exam confidence and ensures thorough preparation for CBSE Class 11 Biology Chapter 7.