In Class 11 Final Exams there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Download of CBSE Class 11 Biology Chapter 7 Case Study and Passage Based Questions with Answers were Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 11 Biology Structural Organisation in Animals to know their preparation level.

In CBSE Class 11 Biology Paper, There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Structural Organisation in Animals Case Study Questions With answers

Here, we have provided case-based/passage-based questions for Class 11 Biology Chapter 7 Structural Organisation in Animals

Case Study/Passage-Based Questions

Case Study 1:

Connective tissues are most abundant and widely distributed in the body of complex animals. They are named connective tissues because of their special function of linking and supporting other tissues/organs of the body. They range from soft connective tissues to specialised types, which include cartilage, bone, adipose, and blood. In all connective tissues except blood, the cells secrete fibres of structural proteins called collagen or elastin. The fibres provide strength, elasticity and flexibility to the tissue. These cells also secrete modified polysaccharides, which accumulate between cells and fibres and act as matrix (ground substance). Connective tissues are classified into three types: (i) Loose connective tissue, (ii) Dense connective tissue and (iii) Specialised connective tissue

Loose connective tissue has cells and fibres loosely arranged in a semi-fluid ground substance, for example, areolar tissue present beneath the skin. Often it serves as a support framework for epithelium. It contains fibroblasts (cells that produce and secrete fibres), macrophages and mast cells. Adipose tissue is another type of loose connective tissue located mainly beneath the skin. The cells of this tissue are specialised to store fats. The excess of nutrients which are not used immediately are converted into fats and are stored in this tissue.

Fibres and fibroblasts are compactly packed in the dense connective tissues. Orientation of fibres show a regular or irregular pattern and are called dense regular and dense irregular tissues. In the dense regular connective tissues, the collagen fibres are present in rows between many parallel bundles of fibres. Tendons, which attach skeletal muscles to bones and ligaments which attach one bone to another are examples of this tissue. Dense irregular connective tissue has fibroblasts and many fibres (mostly collagen) that are oriented differently. This tissue is present in the skin.

Cartilage, bones and blood are various types of specialised connective tissues.

1.) The tissues which has cells with the presence of loosely arranged fibres in a semi-fluid ground substance are termed as

• a) Dense connective tissue
• b) Loose connective tissue
• c) Loose arranged tissue
• d) All of the above

Ans: b) Loose connective tissue

2.) ___________ Tissue present just below the skin serves as a cementing framework for epithelium.

• a.) Adipose tissue
• b) Aeolic tissue
• c) Areolar tissue
• d) Fibroblast cells

Ans:c) Areolar tissue

3.) _________________tissues has collagen fibres present in rows between many parallel bundles of fibres.

• a.) Dense regulated connective tissues
• b) Dense regular connective tissues
• c) Dense irregular connective tissues
• d) Dense regularise connective tissues

Ans:b) Dense regular connective tissues

4.) Name the tissue which is specialised to stores the skin fat. Give its function.

Ans: Adipose tissue is another type of loose connective tissue located mainly beneath the skin. The cells of this tissue are specialised to store fats. The excess of nutrients which are not used immediately are converted into fats and are stored in this tissue.

5.) Why connective tissue is named as connective tissue?

Ans: Connective tissue widely distributed in the body of complex animals. They are named connective tissues because of their special function of linking and supporting other tissues, organs and organ system of the body.

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Case Study 2:

Each muscle is made of many long, cylindrical fibres arranged in parallel arrays. These fibres are composed of numerous fine fibrils, called myofibrils. Muscle fibres contract in response to stimulation, then relax and return to their uncontracted state in a coordinated fashion. Their action moves the body to adjust to the changes in the environment and to maintain the positions of the various parts of the body. In general, muscles play an active role in all the movements of the body. Muscles are of three types, skeletal, smooth, and cardiac. Skeletal muscle tissue is closely attached to skeletal bones. In a typical muscle such as the biceps, striated (striped) skeletal muscle fibres are bundled together in a parallel fashion.

The smooth muscle fibres taper at both ends and do not show striations. Cell junctions hold them together and they are bundled together in a connective tissue sheath. The wall of internal organs such as the blood vessels, stomach and intestine contains this type of muscle tissue. Smooth muscles are ‘involuntary’ as their functioning cannot be directly controlled. We usually are not able to make it contract merely by thinking about it as we can do with skeletal muscles.

Cardiac muscle tissue is a contractile tissue present only in the heart. Cell junctions fuse the plasma membranes of cardiac muscle cells and make them stick together (Figure 7.7c). Communication junctions (intercalated discs) at some fusion points allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.

1.) __________________ is the type of involuntary muscles

• a) Smooth Muscles
• b) Cardiac Muscles
• c) Both a & b
• d) Skeletal Muscle

Ans: c) Both a & b

2.) Identify correct statement

Statement 1 – Cardiac muscle tissue is a contractile tissue present only in the heart.

Statement 2 – The smooth muscle fibres taper at both ends and do not show striations.

Statement 3 – Each muscle is made of many long, cylindrical fibres arranged in parallel arrays.

Statement 4 – Skeletal muscle tissue is closely attached to skeletal bones.

• a) Both 1 & 2
• b) Only 3
• c) Both 2 & 4
• d) All of the above

Ans: d) All of the above

3.) Define myofibrils.

Ans: Myofibrils: Each muscle is made of many long, cylindrical fibres arranged in parallel arrays. These fibres are composed of numerous fine fibrils, called myofibrils.

4.) Give the classification or types of muscle tissue?

Ans: Muscles are of three types

• Skeletal
• Smooth
• Cardiac

5.) Why smooth muscles and cardiac muscles are called as involuntary musclesAnswer key

Ans: Smooth muscles and cardiac muscles are called as involuntary muscles because their functioning cannot be directly controlled and regulated by us.

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