SSC PUBLIC EXAMINATION (2025-26) MODEL PAPER-I
(SCERT 100 days action plan)
BIOLOGICAL SCIENCE CLASS: X
Time: 2 Hours Marks : 50
SECTION – I 1 mark. 6 × 1 = 6 M
1. Ramu wants to measure the blood pressure of Ravi.
Name the instrument Ramu used ?
• Sphygmomanometer
2. What is the phenotypic ratio in a monohybrid cross ?
• 3 : 1
3. Name the part of the pistil which gradually grows to
form the fruit.
• Ovary
4. Prepare slogan on a organ donation.
• Donate organs, save lives.
5. What is the full form of HIV ?
• Human Immunodeficiency Virus
6. Write two examples for the animals which don't
depend on chromosomes for sex determination.
• Crocodile • Turtle
SECTION – II 2 marks. 4 x 2 = 8 M
7. Read the following table.
|
Type of nutrition |
Examples |
|
Autotrophic nutrition |
Plants, Algae |
|
Parasitic nutrition |
Cuscuta, lice, leeches |
Answer
the following questions.
a)
In which type of nutrition is photosynthesis is seen ?
• Autotrophic nutrition
b)
Name the plant which shows parasitic nutrition ?
• Cuscuta
8.
What precautions will you take to maintain proper thyroxin levels in the blood?
• Use iodised salt regularly in food.
• Take a balanced diet and consult a doctor if symptoms appear.
9.
Give two suggestions to control bio magnification.
• Reduce the use of chemical pesticides and insecticides.
• Promote eco-friendly and biodegradable substances.
10.
What is Synapse ? What happens at synapse ?
• Synapse is the junction between two neurons.
• At synapse, nerve impulse is transmitted by chemicals from one neuron
to another.
SECTION – III 4 marks 5 X 4 = 20 M
11.
What questions will you ask about Diabetes to a doctor?
•
What is Diabetes and why does it occur?
• How can blood sugar be controlled daily?
• What food should be avoided and included?
• What happens if Diabetes is not controlled?
12.
a) Draw the neat labelled diagram of structural and functional unit of
exerctory system?
•
Nephron is the structural and functional unit.
(Or)
12.
b) Draw neat labelled diagram of longitudinal section of flower.
•
Follow Reduce, Reuse, Recycle.
• Segregate biodegradable and non-biodegradable waste.
• Avoid plastic usage.
• Prepare compost from kitchen waste.
14.
Alveoli in lungs are designed for efficient gaseous exchange. How do you
justify the statement ?
•
Alveoli have large surface area.
• Walls are very thin.
• Surrounded by many blood capillaries.
• Gases diffuse quickly and easily.
15.
Why is damage to the ozone layer a cause for concern? What steps have to be
taken to minimize this damage ?
•
Ozone layer protects from harmful UV rays.
• Damage causes skin cancer and eye problems.
• Avoid CFCs and harmful chemicals.
• Use eco-friendly products.
• Create awareness and plant trees.
SECTION – IV 2 × 8 = 16 M
16.a) Write an experiment to show that chlorophyll is necessary for
photosynthesis.
Aim
To
show that chlorophyll is necessary for photosynthesis.
Materials
Required
Variegated
plant, water, alcohol, beaker, test tube, burner, iodine solution.
Procedure
I.
Keep plant in dark (3 days)
II. Place in sunlight 4 hours
III. Pluck variegated leaf – mark green areas
IV.
Boil leaf in water
V. keep in hot alcohol
VI. Add iodine solution
Observation
green
parts of the leaf turn blue-black,
yellow
parts do not change colour
.
Result
Starch
is formed only in the green parts of the leaf. Hence, chlorophyll is necessary
for photosynthesis.
(Or)
b) Write the procedure followed by you observe budding in Yeast. (Explain an activity to observe asexual reproduction in
Yeast.)
Aim
To observe yeast
cells and their budding under a microscope.
Materials
Sugar, water,
yeast, test tube, cotton plug, glass slide, coverslip, microscope.
Procedure
1.
Dissolve
sugar solution
2.
Pour
into test tube
3.
Add
yeast pinch
4.
Keep
warm place
5.
Observe
under microscope
Observation
Oval-shaped yeast
cells are seen. Some cells show small outgrowths called buds.
Result
Yeast reproduces
by budding.
.
17.a) Analyse the mechanism of reflex actions.
(How do the reflex responses take
place in animals ? Explain with an example.)
·
Reflex action is a quick, automatic
response without thinking.
·
The stimulus is detected by receptors.
·
The signal travels through sensory
nerves to the spinal cord.
·
A reflex arc is formed in the
spinal cord.
·
The spinal cord sends signals through motor
nerves.
·
Motor nerves act on muscles
immediately.
·
Muscles contract quickly and produce
movement.
·
Example: Pulling the hand back when
touching a hot object.
·
Reflexes protect the body from danger
quickly.
(Or)
b) Male is responsible for sex determination of the baby - do you agree? If
so write your answer with flow chart
Yes, I agree Father is responsible for
sex determination of the baby
i.
Females have XX chromosomes, males have XY chromosomes.
ii.
Female gametes carry X chromosomes.
iii.
Male gametes carry either X or Y chromosomes.
iv.
If a ‘ X’ Sperm fertilizes the egg, the child will be Girl (XX).
v.
If a ‘ Y ‘Sperm fertilizes the
egg, the child will be Boy (XY).
Hence
sex of the child is determined by the father.
