9 class SA 1 KEY PAPER 2025-26

CLICK ABOVE TITLE TO OPEN. Posted on

 

CLASS 9 – BIOLOGICAL SCIENCE SA 1 KEY PAPER

SELF ASSESSMENT TERM-1 MODEL PAPER (2025–26)

SECTION – A (MCQs) (10 × 1 = 10)

1. Identify the structure labelled 'X' in the given diagram.



A) Nucleus

B) Nucleoid

C) Golgi complex

D) Ribosomes

Answer: B) Nucleoid

2. Assertion (A): The shape and size of cells is in relation to their specific function.

Reason (R): Nerve cell has a typical shape with branched extensions as they transmit messages throughout the body.

A) A is correct, R is incorrect
B) A is incorrect, R is correct
C) Both A & R are correct but they are not relevant to each other.
D) A & R both are correct and R is the correct explanation for A.

Answer: D) A & R both are correct and R is the correct explanation for A.

3. Which of the following material will you choose to perform exosmosis experiment in your school laboratory?

A) Boiled egg, sugar solution and a beaker
B) Deshelled egg, tap water and a beaker
C) Dishelled egg, saline water and a beaker
D) Dishelled egg, vinegar and a beaker

Answer: C) Dishelled egg, saline water and a beaker

4. Identify the incorrect statement about endoplasmic reticulum

A) Rough ER acts as the site for protein synthesis.
B) Smooth ER present in vertebrate liver cells plays the important role of detoxifying toxins.
C) Smooth ER stores and transports sugars and proteins.
D) Endoplasmic reticulum with ribosomes attached on the surface is called Rough ER.

Answer: C) Smooth ER stores and transports sugars and proteins.

5. Which of the following cells have cell wall?

  1. Plant cell

  2. Fungus cell

  3. Bacterial cell

  4. Red blood cell

A) 1 & 3
B) 1, 2 & 3
C) 1, 2, 3 & 4
D) 2 & 4

Answer: B) 1, 2 & 3

6. Which of the following tissues stores food in stems and roots?

A) Collenchyma
B) Xylem
C) Parenchyma
D) Phloem

Answer: C) Parenchyma

7. If viruses had their own membranes and cell machinery, what would most likely change?

A) They would not need a host to reproduce
B) They would no longer be harmful
C) They would become visible without microscopes
D) They would stop reproduction completely

Answer: A) They would not need a host to reproduce

8. Why do Eskimos living in tundras have a thicker layer of adipose tissue under their skin?

A) To help muscles contract and relax faster in cold weather
B) To store extra oxygen for breathing in cold condition
C) To reduce heat loss and act as an insulator
D) To make their skin harder and stronger

Answer: C) To reduce heat loss and act as an insulator

9. Who's statements are correct?

Meghana – Cells in sclerenchyma are thick walled while that of the xylem are thin walled.
Neelima – Sclerenchyma is made of living cells while xylem is made of nonliving cells.
Raghu – Sclerenchyma is a simple tissue while xylem is a complex tissue.
Manoj – Sclerenchyma provides strength and xylem serves for transportation along with strength.

A) Meghana & Neelima
B) Raghu & Manoj
C) Neelima & Raghu
D) Meghana & Manoj

Answer: B) Raghu & Manoj

10. Identify the correct matching pair.

a) Ligament - Connection of bones
b) Areolar tissue - Storage of fats
c) Bone - Gives structure & framework
d) Tendon - Connection of muscles

A) a & b
B) b & c
C) a, c & d
D) a & c

Answer: D) a & c

SECTION – B (3 × 2 = 6)

11. Suggest two practice measures to strengthen your cardiac muscle.

Answer:

  1. Regular aerobic exercise
  2. Eating a heart-healthy diet

12. Explain how prokaryotic cell is different from eukaryotes.

Answer:
• Prokaryotic cells lack a true nucleus, while eukaryotic cells have a well-defined nucleus.
• Prokaryotes do not have membrane-bound organelles, but eukaryotes contain membrane-bound organelles like mitochondria and Golgi bodies.

13. Name the following:

i) Tissue that forms the inner lining of our mouth
Epithelial tissue

ii) Connective tissue with a fluid matrix
Blood

SECTION – C (2 × 4 = 8)

14. Write any four situations where you use diffusion in your daily life.

Answer:
• Smelling perfume or incense spreading through a room.
• Sugar dissolving in water without stirring.
• Aroma of food spreading from the kitchen to other rooms.
• Oxygen entering our blood from the lungs during breathing.

15. Draw a neat labelled diagram of a plant cell.

Answer:
Draw a neat labelled diagram of plant cell. | Filo

SECTION – D (2 × 8 = 16)

16. A) Make a list of any 4 cell organelles in a typical cell and mention their functions.

Answer (any four):

  1. Nucleus – Controls all the activities of the cell and stores genetic material (DNA).
  2. Mitochondria – Produce energy for the cell; known as the “powerhouse of the cell.”
  3. Ribosomes – Help in the synthesis of proteins.
  4. Golgi apparatus – Packages, modifies and transports materials inside the cell.

OR

16. B) Differentiate between different types of muscle tissue.

Feature

Skeletal Muscle

Smooth Muscle

Cardiac Muscle

Control

Voluntary

Involuntary

Involuntary

Appearance

Striated (striped)

Non-striated

Striated and branched

Location

Attached to bones

Internal organs (stomach, intestine)

Heart

Function

Movement of body parts

Movement of food, blood, etc.

Pumping of blood throughout body

17. A) Write the procedure you followed to observe various types of tissues in plants.

Aim (1 mark):
To observe various types of tissues present in plants using a temporary slide.

Apparatus (1 mark):
Fresh plant material (stem/leaf/root — e.g., balsam stem or onion)
Blade/razor
Glass slide
Cover slip
Stain (safranin or methylene blue)
Dropper
Needle/brush
Blotting paper
Compound microscope

Procedure (4 marks):

  1. Take a fresh piece of plant material such as stem or leaf.
  2. Using a sharp blade, cut a thin transverse section (T.S.) of the plant part.
  3. Transfer the thin section onto a clean glass slide.
  4. Add a few drops of stain (safranin/methylene blue) and wait for a minute.
  5. Place a cover slip gently over the section without trapping air bubbles.
  6. Remove excess stain around the cover slip using blotting paper.
  7. Place the slide on the stage of the microscope.
  8. Observe the section first under low power and then under high power to identify different tissues.

Observation (1 mark):
The section shows different types of tissues such as:
• Epidermis on the outer side
• Parenchyma and collenchyma in the ground tissue region
• Xylem and phloem arranged together in vascular bundles

Inference (1 mark):
Different plant tissues such as protective, ground, and vascular tissues are arranged in a specific manner to support protection, storage, support, and transport in plants.

 OR

17. B) What is meristematic tissue? What are the different types of meristems? Mention their location and function.

Meristematic Tissue (2 marks):
Meristematic tissue is a type of plant tissue made up of actively dividing cells.
These cells help plants grow in length, thickness, and form new organs.

Types of Meristems, Their Location & Function

 

1. Apical Meristem

Location: At the tips of roots and shoots.
Function:
• Causes increase in length of the plant
• Helps form new leaves, flowers, branches
• Responsible for primary growth

 

2. Lateral Meristem

Location: On the sides of stems and roots (vascular cambium & cork cambium).
Function:
• Causes increase in thickness (girth) of stems and roots
• Responsible for secondary growth

 

3. Intercalary Meristem

Location: At the base of leaves and internodes, especially in grasses.
Function:
• Helps in regrowth and rapid elongation of leaves and internodes
• Important for plants that are grazed or cut often