Self-Assessment Model Paper – 1 (2025-26)
Biological Science – Class : X
Marks ; 35
SECTION – 1 (5 × 1 = 5 Marks)
1. In which parts of the alimentary canal,
proteins get digested?
Stomach and small intestine
2. Expand ATP.
Adenosine Triphosphate
3. What
is the use of the instrument shown in the picture?
4. What will happen if our respiratory tract is
not moist?
Dust and harmful particles would not be trapped, causing respiratory infections
and irritation
5.
What are the factors required for
photosynthesis?
Carbon dioxide, water, sunlight, chlorophyll
SECTION – 2 (3 × 2 = 6 Marks)
6. What is the role of acid in the stomach?
I.
Acid helps in
protein digestion by converting pepsinogen into pepsin
II.
kills bacteria in
food
7. What questions will you ask your teacher about
the evil effects of tobacco consumption?
I.
How does tobacco
harm the respiratory and cardiovascular systems?
II.
What are the
risks of passive smoking?
III.
How can one quit
tobacco effectively?
8. What would be the consequences of deficiency
of hemoglobin in our bodies?
Reduced oxygen transport causes fatigue and weakness; may lead to anemia,
shortness of breath, and dizziness
SECTION – 3 (4 × 4 = 16 Marks)
9. Write the differences between blood and lymph.
|
Blood |
Lymph |
|
Red in color due to
hemoglobin. |
Colorless or pale
yellow. |
|
Flows in blood vessels. |
Flows in lymphatic
vessels. |
|
Transports oxygen and
nutrients. |
Transports lymphocytes
and waste. |
|
Contains red blood cells
(RBCs). |
Does not contain RBCs. |
10
. Observe the flow chart and answer the following questions.
i) In which organelles does pyruvate break down
into carbon dioxide and water?
Answer: Mitochondria
ii) Where does glucose break down into pyruvate?
Answer: Cytoplasm
iii) What are the end products of aerobic
respiration?
Answer: Carbon dioxide, Water, Energy
iv) In which cells is lactic acid formed by the
process of anaerobic respiration?
Answer: Muscle Cells
11. What food habits you will
follow to keep your digestive system healthy?
- Eat fresh, fiber-rich foods like fruits,
vegetables, and whole grains.
- Drink plenty of clean water daily.
- Avoid overeating, junk food, and oily or
spicy meals.
- Eat at regular times and chew food
properly.
- Limit sugary drinks and processed foods.
- Include probiotic-rich foods like curd or
yogurt.
12. Draw a neat
labelled diagram of Human excretory system.
SECTION – 1 (1 × 8 = 8 Marks)
13B. How do you
demonstrate that carbon dioxide is necessary for photosynthesis?
Aim
To show that carbon dioxide is
necessary for photosynthesis.
Apparatus
- Two potted plants
- Potassium hydroxide solution
- Bell jars
- Vaseline
- Methylated spirit (alcohol)
- Water bath
- Iodine solution
- Two glass plates
Procedure
I.
Place both plants in dark for 3 days
II.
Keep plants on glass plates
III.
Put potassium hydroxide near one plant
IV.
Cover both with bell jars and seal with
vaseline
V.
Keep in sunlight for 3 hours
VI.
Take leaves from both plants
VII.
Boil leaves in water then in alcohol
VIII.
Dip leaves in iodine solution (starch test)
Observations
- Plant with Potassium Hydroxide: Leaf
remains pale (no starch).
- Plant without Potassium Hydroxide: Leaf turns
blue-black (starch present).
Inference
The absence of starch in the leaf from
the plant with potassium hydroxide shows that carbon dioxide is needed for
photosynthesis.
Conclusion
Carbon dioxide is
essential for photosynthesis
13B. Write the activity you did in
your laboratory to show the effect of saliva on starch.
Aim: To observe the action of saliva on
starch.
Apparatus:
- 2 test tubes
- Starch solution
- Saliva
- Iodine solution
Procedure:
- Add Saliva: Add 1 ml
of saliva to test tube A.
- Test with Iodine: After 30
minutes, add iodine solution to both test tubes.
Observation:
- Test Tube B: Turns
blue-black (indicating starch presence).
- Test Tube A: No color
change (indicating no starch).
Inference:
- Iodine turns blue-black with starch. Test
tube B still has starch.
- In test tube A, saliva has broken down
the starch into sugars, so no starch reacts with iodine.