Study the figures given below and answer the following questions :
(i) Identify the kind of tissues shown as A, B and C.
(ii) Write one specific location of each in the human body.
(iii) Mention one common function of all.
(iv) Write one structural difference between the tissues A and B.
(v) Which of these two tissues are not under the control of our will ?
(i) The tissues shown in figures A, B, and C are:
A → Striated muscles
B → Unstriated muscles
C → Cardiac muscles
(ii) One specific location of each in the human body:
- Striated muscles are found in face.
- Unstriated muscles are found in the iris of the eyes.
- Cardiac muscles are found only in the walls of the heart.
(iii) All the muscle types can contract and relax. Thus, they help the body in all its movements and locomotion.
(iv) One structural difference between the tissues A and B:
| Striated muscles | Unstriated muscles |
|---|---|
| Striated muscles are skeletal, and stripped. They are attached to the bones. | Unstriated muscles are smooth, and unstripped. |
(v) Unstriated muscles are not under the control of our will.
Chapter 4: Tissue — ICSE Class VII Biology Notes
Complete ICSE Class VII Biology notes on Tissue covering meristematic and permanent plant tissues (parenchyma, collenchyma, sclerenchyma, xylem, phloem) and four animal tissue types with examples and diagrams.
Key Concepts and Topics
Topics covered: Meristematic tissue, Permanent tissue, Animal tissues, Xylem, Phloem
Weightage: Approximately 8 marks in the exam
Important Points to Remember
- Tissue: group of similar cells performing specific function
- Meristematic tissue: actively dividing cells at growth points
- Simple permanent: parenchyma (storage), collenchyma (flexibility), sclerenchyma (strength)
- Complex permanent: xylem (water up) and phloem (food both ways)
- Four animal tissues: epithelial, connective, muscular, nervous
- Three muscle types: skeletal, smooth, cardiac
- Blood is a connective tissue with liquid matrix
Frequently Asked Questions
Q: What is a tissue?
A: A tissue is a group of similar cells that perform a specific function together.
Q: What is the difference between xylem and phloem?
A: Xylem transports water upward and is made of dead cells. Phloem transports food in both directions and is made of living cells.
Q: Why is blood called a connective tissue?
A: Because it connects all body parts by transporting nutrients, oxygen, and waste, even though its matrix (plasma) is liquid.
Exam Preparation Tips
- Focus on understanding concepts rather than rote memorization
- Practice drawing and labelling diagrams regularly
- Use comparison tables for topics that require differentiation
- Solve previous year questions and practice papers
- Review the chapter notes provided by Bright Tutorials for comprehensive coverage
For complete chapter notes, practice questions, and test papers, contact Bright Tutorials at 9403781999.