Biosmentor

kabhi kabhi khud ko dobara banana parta hai.”
Jo tum thay us par afsos mat karo,
jo tum ban saktay ho us par yaqeen rakho.”

1 month ago | [YT] | 13

Biosmentor

Sach batao… MDCAT ka pressure abhi se feel ho raha hai ya nahi? 😅👇”

1 month ago | [YT] | 7

Biosmentor

“Is saal MDCAT kon kon dene wala hai? Comment mein btao 👇🔥”

1 month ago | [YT] | 6

Biosmentor

which one is the correct color of the chloroplast ?

1 month ago | [YT] | 3

Biosmentor

📘 Chapter 1 — Homeostasis

MCQ 1

Which of the following is NOT an example of negative feedback?
A. Regulation of blood glucose by insulin
B. Regulation of body temperature
C. Release of oxytocin during childbirth
D. Control of CO₂ concentration during breathing
Answer: C

MCQ 2

In a nephron, maximum water reabsorption occurs in:
A. Loop of Henle (descending limb)
B. Loop of Henle (ascending limb)
C. Proximal convoluted tubule
D. Collecting duct (under normal conditions)
Answer: C

MCQ 3

Failure of homeostasis first affects which feature of cells?
A. DNA replication
B. Enzyme activity
C. Protein translation
D. Ribosome structure
Answer: B

MCQ 4

Which process helps maintain osmotic balance in Amoeba?
A. Passive diffusion
B. Contractile vacuole activity
C. Active transport of CO₂
D. Pinocytosis
Answer: B

MCQ 5

In humans, ADH release increases when:
A. Blood pressure increases
B. Blood becomes hypotonic
C. Blood becomes hypertonic
D. Glucose decreases
Answer: C

MCQ 6

Which one is incorrect for diabetes mellitus?
A. Glucose appears in urine
B. ADH secretion decreases
C. Cells fail to uptake glucose
D. Polydipsia occurs
Answer: B

MCQ 7

Countercurrent mechanism mainly occurs in:
A. Cortex
B. Upper medulla
C. Juxtamedullary nephrons
D. Bowman’s capsule
Answer: C

MCQ 8

Which of the following is an example of homeostatic imbalance?
A. Sweating during exercise
B. Vasoconstriction in cold
C. High fever
D. Release of insulin
Answer: C

MCQ 9

Aldosterone increases reabsorption of:
A. Potassium
B. Sodium
C. Urea
D. Water only
Answer: B

MCQ 10

Which part of kidney is MOST sensitive to low oxygen supply?
A. Cortex
B. Medulla
C. Renal pelvis
D. Bowman’s capsule
Answer: B

📗 Chapter 2 — Support & Movement

MCQ 1

Which of the following filaments possesses ATPase activity?
A. Actin
B. Tropomyosin
C. Myosin
D. Troponin
Answer: C

MCQ 2

In skeletal muscle, Ca²⁺ binds to:
A. Tropomyosin
B. Troponin-C
C. Troponin-I
D. Myosin head
Answer: B

MCQ 3

Which event occurs first during muscle contraction?
A. Release of Ca²⁺ from sarcoplasmic reticulum
B. Power stroke
C. Detachment of myosin from actin
D. Sliding of actin filaments
Answer: A

MCQ 4

Spongy bone contains:
A. Osteons
B. Haversian canals
C. Trabeculae
D. Synovial fluid
Answer: C

MCQ 5

In the sarcomere, the region with only actin is:
A. A-band
B. I-band
C. H-zone
D. Z-line
Answer: B

MCQ 6

Which vitamin deficiency affects bone mineralization?
A. A
B. C
C. D
D. E
Answer: C

MCQ 7

Arthropods possess which type of skeleton?
A. Endoskeleton
B. Exoskeleton (chitin)
C. Hydrostatic skeleton
D. Cartilaginous skeleton
Answer: B

MCQ 8

As age increases, which component decreases in vertebral discs?
A. Collagen
B. Water content
C. Chondrocytes
D. Blood supply
Answer: B

MCQ 9

Tetany (continuous contraction) results from deficiency of:
A. Na⁺
B. K⁺
C. Ca²⁺
D. Cl⁻
Answer: C

MCQ 10

Which statement about smooth muscle is correct?
A. Multinucleated
B. Non-striated, involuntary
C. Fast contraction
D. Under somatic nervous control
Answer: B

📙 Chapter 3 — Cell Structure & Function

MCQ 1

Which organelle has its own DNA?
A. Golgi apparatus
B. Rough ER
C. Lysosome
D. Mitochondria
Answer: D

MCQ 2

Which structure is absent in prokaryotes?
A. Ribosomes
B. Circular DNA
C. Endoplasmic reticulum
D. Plasma membrane
Answer: C

MCQ 3

Function of smooth ER includes:
A. Protein synthesis
B. Lipid synthesis
C. Ribosome attachment
D. ATP production
Answer: B

MCQ 4

Which of the following is semi-permeable?
A. Cell wall
B. Plasma membrane
C. Lysosomal membrane
D. Nuclear envelope
Answer: B

MCQ 5

Cristae are folds found in:
A. Chloroplast
B. Golgi
C. Mitochondria
D. ER
Answer: C

MCQ 6

Which component identifies a cell as “self”?
A. Glycoproteins
B. Lipid bilayer
C. Cholesterol
D. Nucleolus
Answer: A

MCQ 7

Ribosomes on rough ER synthesize proteins for:
A. Cytosol
B. Nucleus
C. Secretion
D. Mitochondria
Answer: C

MCQ 8

Which structure controls movement in/out of nucleus?
A. Nucleolus
B. Chromatin
C. Nuclear pores
D. Nucleoplasm
Answer: C

MCQ 9

Microtubules are made of:
A. Actin
B. Tubulin
C. Myosin
D. Elastin
Answer: B

MCQ 10

Cell drinking is known as:
A. Phagocytosis
B. Exocytosis
C. Pinocytosis
D. Diffusion
Answer: C



📕 Chapter 4 — Human Respiratory System

MCQ 1

The total volume of air that cannot be expelled, even after a forceful exhalation, is:
A. Tidal volume
B. Expiratory reserve volume
C. Residual volume
D. Vital capacity
Answer: C

MCQ 2

Which of the following prevents alveoli from collapsing during expiration?
A. Elastic recoil
B. Pulmonary surfactant
C. Pleural fluid
D. Diaphragm relaxation
Answer: B

MCQ 3

During normal inspiration, which event is TRUE?
A. Intrapulmonary pressure increases
B. Diaphragm relaxes
C. Thoracic cavity expands
D. Ribs move downward
Answer: C

MCQ 4

Most CO₂ is transported in blood as:
A. Dissolved CO₂ in plasma
B. Carbaminohaemoglobin
C. Bicarbonate ions
D. Carbonic acid
Answer: C

MCQ 5

The respiratory center controlling the basic rhythm of breathing is located in:
A. Hypothalamus
B. Cerebrum
C. Medulla oblongata
D. Cerebellum
Answer: C

MCQ 6

Which structure has the largest surface area for gas exchange?
A. Trachea
B. Primary bronchi
C. Alveoli
D. Bronchioles
Answer: C

MCQ 7

Which change will increase the affinity of haemoglobin for oxygen?
A. Increased CO₂
B. Increased temperature
C. Decreased pH
D. Decreased CO₂
Answer: D

MCQ 8

Chloride shift occurs when:
A. Cl⁻ moves out of RBCs as HCO₃⁻ enters
B. Cl⁻ enters RBCs as HCO₃⁻ leaves RBCs
C. Cl⁻ enters lungs during expiration
D. Cl⁻ binds to haemoglobin
Answer: B

MCQ 9

Which of the following decreases during forceful expiration?
A. Intrapleural pressure
B. Intrapulmonary pressure
C. Thoracic volume
D. Abdominal pressure
Answer: C

MCQ 10

The correct path of air flow from atmosphere to lungs is:
A. Larynx → Trachea → Pharynx → Bronchi
B. Trachea → Larynx → Bronchi → Alveoli
C. Nasal cavity → Pharynx → Larynx → Trachea
D. Nasal cavity → Larynx → Pharynx → Bronchi
Answer: C

1 month ago | [YT] | 5

Biosmentor

What is the real colour of Chloroplast ?
Choose your correct answer from 1,2,3,4

3 months ago | [YT] | 6

Biosmentor

How many bones in Human skeleton ?

3 months ago | [YT] | 5

Biosmentor

What is the right colour of our kidney ?

4 months ago | [YT] | 3

Biosmentor

Biomolecule | Biomolecule one shot |Part # 2 | biomolecule class 11 | biochemistry
Will be upload today ! So stay tuned with me

4 months ago | [YT] | 13

Biosmentor

“Can you guess the right one? 🤔 Which one is HIV?
👉 Comment your answer below!”
#BiologyQuiz #HIV #ScienceFacts #BioStudents #MDCATPrep #NEETPreparation #BioQuiz

5 months ago | [YT] | 8