Tissues in Action | Class 9 Science Notes
By ConceptScroll Team · Published on 17 July 2026 · 2 min read
Tissues in Action – this guide gives you a concise, exam-ready overview of Tissues in Action from Class 9 Science, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
Plant Tissues
Plant tissues are broadly classified into two types: simple tissues and complex tissues. Simple tissues are made up of only one type of cells that are similar in structure and function. They include parenchyma, collenchyma, and sclerenchyma. Parenchyma cells are thin-walled, living cells that help in photosynthesis, storage, and secretion. Collenchyma cells have unevenly thickened walls and provide mechanical support, especially in young stems and leaves. Sclerenchyma cells are dead cells with very thick walls containing lignin, providing rigidity and strength to the plant.
Complex tissues consist of more than one type of cells working together. The two main complex tissues are xylem and phloem. Xylem transports water and minerals from roots to other parts of the plant and also provides mechanical support. It is made up of tracheids, vessels, xylem parenchyma, and xylem fibers. Phloem transports food from leaves to other parts and consists of sieve tube elements, companion cells, phloem fibers, and phloem parenchyma.
The arrangement of these tissues in roots, stems, and leaves is crucial for the plant's survival and growth. For example, in the stem, xylem and phloem are arranged in vascular bundles, which are surrounded by parenchyma cells. This arrangement facilitates efficient transport and support. Understanding these tissues helps explain how plants maintain their structure and carry out essential functions like transport and support.
📊 Diagram: Diagrams show the structure of parenchyma, collenchyma, and sclerenchyma cells with their characteristic cell wall thickness and shape. Another diagram illustrates the components of xylem and phloem, highlighting the sieve tubes, companion cells, vessels, and tracheids. The vascular bundle arrangement in stem cross-section is also depicted.
🧪 Activity: Observation of plant tissues under a microscope to identify parenchyma, collenchyma, and sclerenchyma cells.
🔗 Connection: This section leads to the next on the functions of plant tissues, particularly focusing on transport and support mechanisms.
Frequently asked questions
Which of the following best defines a tissue in multicellular organisms?
A group of cells similar in structure performing a specific function
Why do plant cells have a rigid shape compared to animal cells?
Because plant cells have a rigid cell wall made of cellulose
Which type of meristematic tissue is responsible for the increase in length of roots and shoots in plants?
Apical meristem
In the experiment with onion bulbs placed in jars A and B, why did the roots in jar B stop growing after the root tips were cut?
Because root tips contain actively dividing cells essential for growth
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- खाद्य संसाधनों में सुधार | Class 9 Science Notes
Clear NCERT-aligned notes on खाद्य संसाधनों में सुधार for Class 9 Science.
- खाद्य संसाधनों में सुधार | Class 9 Science Notes
Clear NCERT-aligned notes on खाद्य संसाधनों में सुधार for Class 9 Science.