The figures given below represent three kinds of supporting tissues in plants.
A
B
C
(i) Mention the name of tissues (A), (B) and (C).
(ii) Write one structural difference between the tissues A and B.
(iii) Which of these tissues is located in the petiole of a leaf ?
(iv) Write one functional difference between the tissues A and C.
(v) Name the tissue in which the cells are long, narrow, thick-walled and dead.
(i) The name of tissues (A), (B) and (C) are:
A → Parenchyma
B → Collenchyma
C → Sclerenchyma
(ii) One structural difference between Parenchyma and Collenchyma:
| Parenchyma | Collenchyma |
|---|---|
| Parenchyma is composed of large thin walled cells, usually with intercellular spaces. | Collenchyma is made up of living cells which are elongated and are thick at the corners or edges. |
(iii) Collenchyma is located in the petiole of a leaf.
(iv) One functional difference between Parenchyma and Sclerenchyma:
| Parenchyma | Sclerenchyma |
|---|---|
| Parenchyma stores food material. | Sclerenchyma provides a rigid mechanical and structural support to the plant. |
(v) Sclerenchyma is composed of cells that are long, narrow, thick-walled and dead.
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.