Short Intro
“Tissues in Action” chapter explains how groups of similar cells work together to perform specific functions in plants and animals. This chapter covers plant tissues, animal tissues, meristematic tissues, epithelial tissues, connective tissues, muscles, nervous tissues, joints, and skeletal system. Below are complete step-by-step solutions with explanations for all textbook questions in simple Unicode format suitable for uploading on www.mymockmate.com.
Quick Information Box
| Topic | Details |
|---|---|
| Chapter Name | Tissues in Action |
| Subject | Science |
| Grade | Class 9 |
| Main Concepts | Plant & Animal Tissues |
| Important Topics | Meristematic Tissue, Permanent Tissue, Muscles, Joints |
| Difficulty Level | Medium |
| Exam Importance | Very High |
Concepts Used (Topics Covered)
- Tissue and division of labour
- Plant tissues and animal tissues
- Meristematic tissues
- Permanent tissues
- Xylem and phloem
- Epithelial tissue
- Connective tissue
- Muscular tissue
- Nervous tissue
- Skeletal system
- Types of joints
- Musculoskeletal coordination
Important Formulas
Percentage Formula
Percentage=WholePart×100
Average Formula
Average=Number of ObservationsSum of Observations
Questions & Step-by-step Solutions with Explanation
Question 1
Meristematic tissues divide repeatedly. What property allows them to do this?
Answer
Correct Option: (iii)
Explanation
Meristematic cells have:
- Thin cell walls
- Dense cytoplasm
- Large nucleus
- No vacuoles
These features help them divide continuously.
Question 2
Which tissue malfunctions if food transport from leaves to roots stops?
Answer
Correct Option: (ii) Phloem
Explanation
Phloem transports prepared food from leaves to all parts of the plant.
Question 3
Why are epithelial tissues usually thin?
Answer
Correct Option: (iii)
Explanation
Thin epithelial layers help in:
- Quick diffusion
- Fast absorption
- Efficient gas exchange
Question 4
Difference between straight-leg jump and normal jump?
Answer
- In straight-leg jump, knees and ankles remain stiff.
- In normal jump, knees and ankles bend naturally.
- Bending absorbs shock and gives better balance.
Question 5
Which joint helps in bending knees and ankles?
Answer
Correct Option: (ii) Hinge Joint
Explanation
Hinge joints allow movement in one direction only.
Question 6 Assertion-Reason Answers
A
Answer
Correct Option: (iii)
Explanation
Assertion is true but reason is false because lungs have thin epithelial tissue for rapid diffusion.
B
Answer
Correct Option: (i)
Explanation
Cardiac muscles contain many mitochondria and rich blood supply, helping continuous contraction.
C
Answer
Correct Option: (iv)
Explanation
Assertion is false because ligaments connect bone to bone. Tendons connect muscle to bone.
D
Answer
Correct Option: (iii)
Explanation
Hinge joints move mainly in one plane, but sliding in all directions does not occur.
Question 7
(i) Interpretation of Graph
As age increases, diameter of teak tree also increases gradually.
(ii) Relation Between Diameter and Annual Rings
More annual rings indicate older tree age and greater stem diameter.
(iii) Tissue Responsible for Girth
Answer
Lateral meristem (cambium) is responsible for increase in girth.
Location
It is located along the circumference of the stem.
Question 8
(i) Which functions are affected by debarking?
- Protection
- Food transport
(ii) Which tissue may be affected?
Answer
Phloem tissue
(iii) Which function gets hampered?
Transport of food from leaves to other parts.
(iv) Assumptions
Assuming bark damage includes phloem injury. If only outer bark is removed, effects may be less severe.
Question 9
Which tissue provides flexibility in mango sapling?
Answer
Collenchyma tissue
Explanation
Collenchyma provides flexibility and support.
If replaced by sclerenchyma
The stem would become rigid and may break during strong winds.
Question 10
(i) Why did type B cutting grow?
Because type B had nodes containing intercalary meristem.
(ii) Difference between A and B
Type B contained buds/nodes while A did not.
(iii) Observation Made
Growth and sprouting of new shoots were observed.
(iv) Parameters to Keep Same
- Water
- Soil
- Sunlight
- Temperature
- Size of cuttings
Question 11
Explanation
Simple tissues contain only one type of similar cells.
Complex tissues contain different types of cells working together for one function.
Example:
- Xylem
- Phloem
Question 12
Which tissue gives strength to coconut husk fibres?
Answer
Sclerenchyma
Explanation
Sclerenchyma has thick lignified walls providing toughness and strength.
Parenchyma cannot provide strength because its cells are soft and thin-walled.
Question 13
Is Vibha’s statement correct?
Answer
No
Explanation
Meristematic tissues are also present as:
- Lateral meristem
- Intercalary meristem
Question Neha can ask
“Why does grass regrow after cutting?”
Question 14
(i) Which cell has larger vacuole?
Answer
Plant cell
Reason
Plant cells require large vacuoles for storage and maintaining turgidity.
(ii) Assumption
Assuming both cells are mature and healthy.
Question 15
Questions to examine the statement
- Does every tissue perform only one function?
- Can one tissue perform multiple functions?
- Are some tissues involved in both support and transport?
Examples
- Parenchyma
- Xylem
- Epidermis
Common Mistakes
- Confusing xylem and phloem
- Writing tendon instead of ligament
- Forgetting that sclerenchyma cells are dead
- Mixing voluntary and involuntary muscles
- Confusing hinge joint with pivot joint
Exam Tips
- Learn functions of all tissues in table form.
- Practice diagrams of neuron, muscles and joints.
- Remember examples of each tissue.
- Revise differences between plant and animal tissues.
- Focus on assertion-reason questions carefully.
Practice MCQs
1. Which tissue transports water in plants?
A. Phloem
B. Xylem
C. Epidermis
D. Collenchyma
Answer
B. Xylem
2. Which muscle is involuntary and striated?
A. Skeletal
B. Smooth
C. Cardiac
D. Tendon
Answer
C. Cardiac
3. Which tissue forms outer covering of body?
A. Nervous
B. Epithelial
C. Muscular
D. Connective
Answer
B. Epithelial
4. Which joint is present in shoulder?
A. Pivot
B. Hinge
C. Fixed
D. Ball and socket
Answer
D. Ball and socket
FAQ Section
Q1. What is a tissue?
A tissue is a group of similar cells performing a specific function.
Q2. What are the main types of plant tissues?
Meristematic and permanent tissues.
Q3. Which tissue transports food in plants?
Phloem transports food.
Q4. Which tissue helps in movement?
Muscular tissue helps in movement.
Q5. Which joint allows circular movement?
Ball and socket joint.
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