Chapter 6: Tissues Case Study Questions | science Class 9 CBSE

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Chapter 6: Tissues Case Study Questions | science Class 9 CBSE | ByteNotes.in

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Case Set 1

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A student observed onion roots growing in water for several days. When the root tips were removed, he noticed a slowdown in growth. This activity helped him understand meristematic tissues.

Question 1: Q1. What conclusion can be drawn about the location of meristematic tissues?

Meristematic tissues are located at the root and shoot tips.
They are responsible for the growth of roots and stems.
Removing the tip stops division, halting growth.

Question 2: Q2. What are the types of meristematic tissues based on location?

Apical meristem – at tips of roots and shoots.
Lateral meristem – increases girth.
Intercalary meristem – at internodes or base of leaves.

Question 3: Q3. What are key features of meristematic cells?

They are actively dividing and thin-walled.
Have dense cytoplasm and prominent nuclei.
Lack vacuoles since they don’t store anything.

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In an experiment, Riya stained plant stem sections and observed three simple permanent tissues: parenchyma, collenchyma, and sclerenchyma under the microscope.

Question 1: Q1. What are the characteristics of parenchyma cells?

Living, unspecialized cells with thin walls.
Have large intercellular spaces.
Store food and sometimes perform photosynthesis (chlorenchyma).

Question 2: Q2. How is collenchyma different from parenchyma?

Living cells with thickened corners.
Provide flexibility and mechanical support.
Found under epidermis in stems and leaf stalks.

Question 3: Q3. Describe the structure and function of sclerenchyma.

Dead cells with thick lignified walls.
Very little or no internal space.
Provide rigidity and support to plant parts.

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Case Set 3

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During a microscope observation, a student noted a continuous layer of cells with a waxy coating on the outer surface of leaves. The teacher identified it as epidermal tissue.

Question 1: Q1. What is the function of the epidermis in plants?

Protects internal tissues from injury and infection.
Regulates water loss via transpiration.
Secretes a waxy cuticle to reduce evaporation.

Question 2: Q2. What are stomata and their functions?

Small pores in the epidermis.
Allow gas exchange and transpiration.
Surrounded by guard cells that open and close them.

Question 3: Q3. How does the epidermis adapt in desert plants?

Has a thick layer of cutin to prevent water loss.
May be multilayered or heavily wax-coated.
Ensures survival in dry conditions.

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Case Set 4

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To understand plant transport, students studied vascular bundles consisting of xylem and phloem. They learned that xylem transports water, while phloem transports food.

Question 1: Q1. What are the components of xylem?

Tracheids and vessels – transport water.
Xylem parenchyma – stores food.
Xylem fibres – provide support.

Question 2: Q2. What is the function of phloem?

Transports food from leaves to other parts.
Made of sieve tubes, companion cells, and phloem parenchyma.
Most phloem cells are living except fibres.

Question 3: Q3. What is a vascular bundle?

Combination of xylem and phloem.
Conducting tissues in plants.
Enable transport of water, minerals, and food.

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Case Set 5

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A patient with a ligament tear was advised rest. The doctor explained that ligaments connect bones and contain strong elastic tissue with minimal matrix.

Question 1: Q1. What is the function of ligaments?

Connect bones to other bones.
Provide stability and support to joints.
Allow limited flexibility while being strong.

Question 2: Q2. How are tendons different from ligaments?

Tendons connect muscles to bones.
Tendons are less elastic but stronger than ligaments.
Both are fibrous connective tissues.

Question 3: Q3. Why is injury to ligaments painful and slow to heal?

Ligaments have poor blood supply.
Inflammation and swelling restrict movement.
Healing takes longer due to limited nutrients.

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Chapter sections

Chapter 6: Tissues | Case Study Questions

Passage

Question 1: Q1. What conclusion can be drawn about the location of meristematic tissues?

Question 2: Q2. What are the types of meristematic tissues based on location?

Question 3: Q3. What are key features of meristematic cells?

Passage

Question 1: Q1. What are the characteristics of parenchyma cells?

Question 2: Q2. How is collenchyma different from parenchyma?

Question 3: Q3. Describe the structure and function of sclerenchyma.

Passage

Question 1: Q1. What is the function of the epidermis in plants?

Question 2: Q2. What are stomata and their functions?

Question 3: Q3. How does the epidermis adapt in desert plants?

Passage

Question 1: Q1. What are the components of xylem?

Question 2: Q2. What is the function of phloem?

Question 3: Q3. What is a vascular bundle?

Passage

Question 1: Q1. What is the function of ligaments?

Question 2: Q2. How are tendons different from ligaments?

Question 3: Q3. Why is injury to ligaments painful and slow to heal?

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