SELF ASSESSMENT TERM 1
MODEL PAPER-2025-2026
1.
Write a
balanced chemical equation of Photosynthesis.
sunlight
6CO2+12H2O
--→ C6H12O6+6O2+6H2O
Chlorophyll
2.
What does this schematic diagram
represent?
Double Circulation
3. Expand ADP.
ADP – Adenosine Diphosphate
4. What waste products are
stored in the older xylem cells of plants?
Resins, tannins, oils, and
gums are stored as waste products in older xylem (heartwood) cells of plants
5. We buy salt packets
enriched with iodine. Is it the right thing? Why should we take iodine as a
part of our food?
Yes, buying iodized salt is
correct because iodine prevents goitre and is essential for thyroid hormone
production.
6. Write a slogan to aware
people on "No Tobacco usage".
Slogan: “Say NO to
tobacco — Yes to life!”
SECTION-II 4x2=8
7. What is fermentation?
Where do we use this process?
·
Fermentation is the process in which
microorganisms like yeast convert sugars into alcohol and carbon dioxide in the
absence of oxygen.
·
This process is used in making bread,
idli batter, curd, wine, and alcohol.
8.
|
Tropic Movement |
Stimulus |
|
Phototropism |
Light |
|
Thigmotropism |
Touch |
|
Chemotropism |
Chemicals |
|
Hydrotropism |
Water |
|
Geotropism |
Gravity |
a) What is the response
caused by chemicals called? What is the response caused by chemicals called?
Chemotropism.
b) Which type of tropic
movement causes tendrils to grow towards the support?
Thigmotropism
9. What are unisexual and
bisexual flowers? Explain with examples.
- Unisexual flowers:
Flowers that have either stamens (male) or pistils (female) but not both.
Examples: Papaya, Watermelon, Maize. - Bisexual flowers:
Flowers that contain both stamens (male part) and pistil (female part) in the same flower.
Examples: Hibiscus, Rose, Mustard.
10. Diabetes is a chronic
disease. What precautions will you take to control Diabetes of your
Grandfather?
- Give him a balanced diet with less sugar and
fewer carbohydrates.
- Encourage regular walking/exercise every
day.
- Ensure he takes medicines/insulin on time.
- Monitor blood sugar levels regularly.
SECTION-III 5 x 4 = 20
11. What are the different
types of blood vessels in humans? Write their functions.
Humans have three types of blood vessels: Arteries, Veins,
and Capillaries.
Arteries: carry oxygen-rich blood away from the heart to body organs.
They have thick, elastic walls to withstand high pressure.
Veins: carry oxygen-poor blood
towards the heart.
They have thin walls and valves to prevent backflow.
Capillaries: help in the exchange of gases, nutrients, and waste between blood and
tissues.
12. (a) Female Reproductive
System
OR 12. (b) Neuron
13. How to determine whether
the tall plant is homozygous tall or heterozygous tall?
To determine if the tall green pea plant is homozygous or heterozygous,
cross it with a short plant (tt) and analyze the offspring using a Punnett
square.
Punnett Square for TT x tt:
|
t |
t |
|
|
T |
Tt |
Tt |
|
T |
Tt |
Tt |
All offspring will be Tt (tall).
Punnett Square for Tt x tt:
|
t |
t |
|
|
T |
Tt |
Tt |
|
t |
tt |
tt |
Offspring will be 50% Tt (tall) and 50% tt (short).
- If all offspring are tall (Tt), the tall
plant is homozygous (TT).
- If there are both tall (Tt) and short (tt)
offspring, the tall plant is heterozygous (Tt).
14. Advantages of sexual
reproduction over asexual reproduction
- Produces variation among offspring.
- Variation helps species adapt to
environmental changes.
- Increases chances of survival against
diseases and climate changes.
- Helps in evolution through natural
selection.
- Offspring are genetically different,
reducing risks of defects.
- Leads to formation of more vigorous and
healthy generations.
15. What happens if all body
functions are controlled only by the brain?
·
If all actions of the human body are
controlled by brain, our body will get harm in dangerous situations.
·
Some actions may be delayed and our
brain could not conduct reflex actions, which require immediate action to a
stimulus.
·
For example, when we touch a hot object,
we require an immediate response to save our hand. If the brain controls this
action, the time taken will be more and our hand will burn.
·
So, it is controlled by spinal cord, the
response will be quick, and we may escape the danger.
·
Nerves can not reach the every corner of
the body, whereas hormones of endocrine glands can do that.
·
So it's not good that all functions are
controlled by brain.
·
SECTION-IV 2 x 8 = 16
16. A) Write the procedure
of the experiment to prove that chlorophyll is necessary for Photosynthesis?
Aim
To
prove that chlorophyll is necessary for photosynthesis
Materials
- Potted plant
with variegated leaves
- Alcohol
- Water bath
- Iodine
- Bunsen
burner
Procedure
1.
De-starch
the Plant: Place the plant in darkness for 3 days.
2.
Photosynthesis:
Expose the plant to sunlight for 6 hours.
3.
Prepare
the Leaf:
Ø Pluck a leaf and mark the green areas.
Ø Boil the leaf briefly.
Ø Immerse in alcohol in a water bath.
4.
Stain
the Leaf: Dip the leaf in iodine solution.
Observations
- Green Areas:
Turn blue-black, indicating starch presence.
- Non-Green
Areas: Remain pale, showing no or very less starch.
Inference
- Starch in green areas means chlorophyll
is needed for photosynthesis.
(Or)
B) Write in detail the
procedure you followed to observe spores of Rhizopus in your school laboratory.
Aim:
To observe the growth of Rhizopus on bread.
Materials:
Moist bread slice, petri dish, magnifying glass
Procedure:
1.
Place
a moist bread slice in a cool, dark place for two days.
2.
Observe
the bread under a magnifying glass.
Observation:
A white mass of mold (Rhizopus) grows on the bread, later turning black.
Conclusion:
Rhizopus
mold produces black sporangia that release spores for reproduction.
17.A) Analyse how sex
determination takes place in humans.
Chromosomes:
- Humans
have 23 pairs of chromosomes, including 1 pair of sex chromosomes.
- Females:
XX chromosomes.
- Males:
XY chromosomes.
Gametes:
- Females
produce eggs, all carrying the X chromosome.
- Males
produce sperm, which can carry either an X or Y chromosome.
Fertilization:
- If
an egg is fertilized by a sperm carrying the X chromosome, the child will
be female (XX).
- If
an egg is fertilized by a sperm carrying the Y chromosome, the child will
be male (XY).
Conclusion:
- The
sex of the child is determined by the father, as the sperm contributes
either an X or Y chromosome.
- The
mother always contributes an X chromosome.
(Or)
B) Differentiate nervous and
hormonal mechanisms for control and co-ordination in animals.
|
Nervous Mechanisms |
Hormonal Mechanisms |
|
Nervous
system (brain, spinal cord, and nerves) |
Endocrine
system (glands and hormones) |
|
Electrical
impulses (neurons) |
Chemical
messengers (hormones in the blood) |
|
Very
fast (milliseconds) |
Slow
(minutes to hours) |
|
Short-term
(immediate but brief) |
Long-term
(effects last longer) |
|
Muscle
contraction, reflex actions |
Regulation
of metabolism, growth, and reproductive functions |
|
Immediate
body actions (reflexes, movement, sensory input) |
Gradual
processes (growth, puberty, metabolism) |
|
Localized
and quick |
Systemic
(affects the entire body) |
|
Easily
reversible |
Usually
takes longer to reverse effects |
|
Reflex
actions, voluntary movements |
Release
of insulin, growth hormone, adrenaline |