FBISE Biology PBA 2025
Full Solved Questions
SECTION A – 60% Weightage (Total 9 Marks)
This section includes questions based on practicals from Part-I of the prescribed syllabus.
Q1: Comparison of X-ray Films (Smoker vs. Healthy Lungs of Man)
Answer:
-
A smoker’s lung X-ray often shows dark greyish patches, lessened transparency, and broken alveoli due to tar and smoke accumulation.
-
A healthy person’s lung X-ray looks clear with visible bronchi and alveoli.
-
This experiment demonstrates how smoking affects respiratory progress and enhances the risk of lung diseases like emphysema and cancer.
Q2: Comparison of Muscle Tissues (Skeletal, Smooth, Cardiac)
Answer:
-
Skeletal muscles: Long, cylindrical, striated, multinucleated, and under voluntary control e.g Arms and Legs.
-
Smooth muscles: Spindle-shaped, non-striated, single nucleus, and involuntary e.g. Small Intestine).
-
Cardiac muscles: Branched, striated, single nucleus, involuntary, with intercalated discs e.g. Heart.
Q3: Observation of MRI Scans (Awake vs. Sleeping Brain of Human)
Answer:
-
During sleep, the brain MRI shows resting activity, especially in the frontal cortex.
-
An awake brain shows increased activity, especially in regions responsible for memory, vigilance, and decision-making.
-
This highlights the brain's energy conservation and repair mode during sleep.
Q4: Observation of Spider Web and Stimuli Response
Answer:
-
When stimuli like light touch or vibration are introduced, the spider quickly reacts by traveling to the center or toward the prey.
-
This shows spiders have built-in, innate behaviors or instincts, such as web building and prey capture.
-
The experiment highlights inborn responses in arthropods.
Q5: Evaluation of Gene Inheritance via Mathematical Probability
Answer:
-
Using Punnett squares, we can guess genotypes from parental alleles.
-
Example: Cross Aa × Aa (heterozygous parents).
-
Genotype ratio: 1 AA : 2 Aa : 1 aa
-
Phenotype ratio: 3 : 1
-
This shows Mendelian inheritance and probability in genetics.
Q6: Dice Probability Simulation
Answer:
-
Throw a dice for 100 times and note how many times you find a “6”.
-
Theoretical probability: 1/6 ≈ 16.67%
-
Expected result in 100 throws: ~16–17 sixes
-
Helps students understand random chance and mathematical modeling.
Q7: Blood Group Data Collection and Graph Creation
Answer:
-
Gather data from classmates on blood groups (A, B, AB, O).
-
Use findings to create:
-
Histogram (bars representing frequencies)
-
Pie chart (circle showing percentage share)
-
Q8: Blood Group Testing Using Antisera
Answer:
-
We use Antisera A, B, and D to test unknown blood samples.
-
Agglutination in:
-
Anti-A only → Group A
-
Anti-B only → Group B
-
Both → AB
-
None → O
-
-
Agglutination in Anti-D shows Rh+; if no agglutination = Rh-
🔹 SECTION B – 40% Weightage (Total 6 Marks)
This section covers practicals from Part-II of the syllabus.
Q1: Identification of Respiratory and Reproductive Parts of a Frog
Answer:
-
Respiratory parts: Lungs, epiglottis, skin (for cutaneous respiration)
-
Male reproductive parts: Testes, VAS deferens sperm ducts
-
Female parts: Ovaries, oviducts, fallopian tubes
Q2: Examination of Sheep Lungs
Answer:
-
Healthy sheep lungs are pinkish and spongy due to air-filled alveoli.
-
Diseased lungs may appear gray, firm, or have greyish patches.
Q3: Identification of Bones Using Skeleton Model
Answer:
-
Pelvic girdle: Bones related to hip region
-
Pectoral girdle: Shoulder bones (scapula, clavicle)
-
Arm bones: Humerus, radius, ulna
-
Leg bones: Femur, tibia, fibula
Q4: Histology of Ovaries (Slide Examination)
Answer:
-
Ovarian slides show follicles at various stages:
-
Primary follicle
-
Secondary follicle
-
Graafian follicle
-
-
So have a clear idea about the menstrual stages.
Q5: Identification of Vertebrate Groups through Blastula Diagrams
Answer:
-
Slides may show early embryonic stages like Gastrula & Blastula
-
Identify the group (e.g., fish, amphibians, birds, mammals) by structure and yolk distribution
-
Focus on Embryonic Stages diagrams
Q6: Chick Development Stages Using Prepared Slides
Answer:
-
Slides identification
-
18-hour embryo (primitive streak)
-
24-hour (head fold)
-
33-hour (heart formation)
-
-
Focus on Organogenesis Diagrams
0 Comments