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What is the smallest structural and functional unit of the human body?
मानव शरीर की सबसे छोटी संरचनात्मक और कार्यात्मक इकाई क्या है?
(A) Tissue
(B) Organ
(C) Cell
(D) Atom
✅ Answer & Explanation
Sahi jawab: C) CellExplanation: The cell is the basic structural and functional unit capable of performing all vital biological processes independently.
Which part of the human sperm contains mitochondria to provide motility energy?
शुक्राणु के किस भाग में तैरने की गति हेतु ऊर्जा प्रदान करने के लिए माइटोकॉन्ड्रिया होते हैं?
(A) Head
(B) Acrosome
(C) Middle piece
(D) Principal end-piece
✅ Answer & Explanation
Sahi jawab: C) Middle pieceExplanation: The middle piece contains spirally arranged mitochondria that produce ATP to power the flagellar tail.
Which organ in the human body exhibits the highest cellular regeneration capacity?
मानव शरीर के किस अंग में पुनर्योजन (Regeneration) की क्षमता सर्वाधिक होती है?
(A) Brain
(B) Heart
(C) Liver
(D) Kidney
✅ Answer & Explanation
Sahi jawab: C) LiverExplanation: Hepatocytes in the liver can undergo rapid proliferation to restore functional mass even after extensive surgical resection.
Which type of white blood cell is the largest in size and acts as a scavenger of cellular debris?
कौन सा WBC आकार में सबसे बड़ा होता है और मृत कोशिकाओं व कचरे को साफ करने वाले सफाईकर्मी के रूप में कार्य करता है?
(A) Lymphocyte
(B) Monocyte
(C) Basophil
(D) Eosinophil
✅ Answer & Explanation
Sahi jawab: B) MonocyteExplanation: Monocytes are the largest circulating leukocytes; they migrate into tissues and differentiate into phagocytic macrophages.
Excess lipids in the human body are primarily stored in which specialized connective tissue?
मानव शरीर में अतिरिक्त वसा मुख्य रूप से किस विशेष संयोजी ऊतक में जमा होती है?
(A) Nervous tissue
(B) Adipose tissue
(C) Dense fibrous tissue
(D) Hyaline cartilage
✅ Answer & Explanation
Sahi jawab: B) Adipose tissueExplanation: Adipose tissue is a specialized loose connective tissue containing adipocytes that store triglycerides and insulate against heat loss.
Which semi-autonomous organelle contains its own circular DNA and 70S ribosomes inside a eukaryotic cell?
यूकैरियोटिक कोशिका के भीतर किस अंगक के पास अपना वृत्ताकार डीएनए और 70S राइबोसोम होता है?
(A) Golgi apparatus
(B) Mitochondria
(C) Lysosome
(D) Peroxisome
✅ Answer & Explanation
Sahi jawab: B) MitochondriaExplanation: Mitochondria contain bacterial-type 70S ribosomes and circular DNA, reflecting their prokaryotic endosymbiotic ancestry.
The enzymatic reactions of the Krebs Cycle (TCA cycle) occur within which cellular compartment?
क्रैब्स चक्र (TCA चक्र) की एंजाइमी अभिक्रियाएं कोशिका के किस भाग में होती हैं?
(A) Cytosol
(B) Mitochondrial Matrix
(C) Thylakoid lumen
(D) Intermembrane space
✅ Answer & Explanation
Sahi jawab: B) Mitochondrial MatrixExplanation: Pyruvate-derived acetyl-CoA enters the mitochondrial matrix, where soluble Krebs cycle enzymes oxidize it to CO2 and yield reducing equivalents.
Which molecule acts as the universal chemical energy currency in cellular metabolism?
कोशिकीय चयापचय में 'ऊर्जा की सार्वभौमिक मुद्रा' किसे कहा जाता है?
(A) Glucose
(B) ATP (Adenosine Triphosphate)
(C) Creatine phosphate
(D) Pyruvic acid
✅ Answer & Explanation
Sahi jawab: B) ATP (Adenosine Triphosphate)Explanation: Hydrolysis of high-energy phosphoanhydride bonds in ATP drives endergonic cellular reactions.
Muscle soreness and fatigue during strenuous anaerobic exercise are primarily caused by the buildup of:
तीव्र अनॉक्सी परिश्रम के दौरान मांसपेशियों में दर्द और थकान का प्राथमिक कारण किसका जमाव है?
(A) Acetic acid
(B) Lactic acid
(C) Uric acid
(D) Pyruvic acid
✅ Answer & Explanation
Sahi jawab: B) Lactic acidExplanation: Anaerobic glycolysis reduces pyruvate to lactic acid, contributing to intracellular acidosis and muscular fatigue.
Which mitotic stage is most suitable for karyotyping and analyzing chromosome morphology?
गुणसूत्रों की संरचना और आकारिकी के अध्ययन के लिए समसूत्री विभाजन की कौन सी अवस्था सर्वोत्तम है?
(A) Prophase
(B) Metaphase
(C) Anaphase
(D) Telophase
✅ Answer & Explanation
Sahi jawab: B) MetaphaseExplanation: During Metaphase, chromosomes reach maximum condensation and align along the equatorial plate, making them clearly visible.
Household table sugar derived from sugarcane is chemically known as:
गन्ने से प्राप्त साधारण घरेलू चीनी का रासायनिक नाम क्या है?
(A) Glucose
(B) Fructose
(C) Sucrose
(D) Lactose
✅ Answer & Explanation
Sahi jawab: C) SucroseExplanation: Sucrose is a non-reducing disaccharide composed of glucose and fructose linked by an alpha-1,2-glycosidic bond.
Which organelle contains the genomic material and serves as the command center of eukaryotic cells?
कोशिका की सभी गतिविधियों को नियंत्रित करने वाला 'नियंत्रण केंद्र' या 'मस्तिष्क' कौन सा अंगक है?
(A) Mitochondria
(B) Nucleus
(C) Ribosome
(D) Golgi apparatus
✅ Answer & Explanation
Sahi jawab: B) NucleusExplanation: The nucleus encloses genomic chromatin and regulates transcription, cell division, and cellular metabolism.
Which common suffix denotes carbohydrate sugars in biochemical nomenclature?
जैव रासायनिक नामकरण में कार्बोहाइड्रेट शर्कराओं को किस प्रत्यय (Suffix) द्वारा पहचाना जाता है?
(A) -ase
(B) -ose
(C) -ine
(D) -ate
✅ Answer & Explanation
Sahi jawab: B) -oseExplanation: Carbohydrate monomers and oligomers typically end with '-ose' (e.g., glucose, fructose, ribose), whereas enzymes end with '-ase'.
The primary natural disaccharide found in mammalian milk is:
दूध में पाई जाने वाली प्राकृतिक डाइसैकेराइड शर्करा कौन सी है?
(A) Maltose
(B) Sucrose
(C) Lactose
(D) Galactose
✅ Answer & Explanation
Sahi jawab: C) LactoseExplanation: Lactose is formed from beta-D-galactose and alpha/beta-D-glucose through a beta-1,4-glycosidic bond.
Which bone cells synthesize and deposit new organic bone matrix during ossification?
हड्डियों के निर्माण और मरम्मत के लिए नई मैट्रिक्स बनाने वाली कोशिकाएं कौन सी हैं?
(A) Osteoclasts
(B) Osteoblasts
(C) Osteocytes
(D) Chondrocytes
✅ Answer & Explanation
Sahi jawab: B) OsteoblastsExplanation: Osteoblasts synthesize collagen and regulate bone mineralization, later maturing into osteocytes.
Which multinucleated cells are responsible for bone resorption and degradation of mineralized bone matrix?
पुरानी या क्षतिग्रस्त हड्डियों के ऊतकों को घोलकर नष्ट करने वाली कोशिकाएं कौन सी हैं?
(A) Osteoblasts
(B) Osteoclasts
(C) Osteocytes
(D) Fibroblasts
✅ Answer & Explanation
Sahi jawab: B) OsteoclastsExplanation: Osteoclasts derive from macrophage lineages and secrete acid and collagenases to break down old bone during remodeling.
Mature, non-dividing bone cells trapped within mineralized lacunae are called:
अस्थि मज्जा के मैट्रिक्स में फंसी परिपक्व गैर-विभाजनकारी हड्डी कोशिकाएं क्या कहलाती हैं?
(A) Osteoclasts
(B) Osteocytes
(C) Osteoblasts
(D) Chondroblasts
✅ Answer & Explanation
Sahi jawab: B) OsteocytesExplanation: Osteocytes maintain mineral homeostasis and transduce mechanical stress signals throughout the skeletal matrix.
Which viscous fluid lubricates diarthrodial (movable) joints to minimize frictional wear?
चल जोड़ों में घर्षण को रोकने और चिकनाई देने वाला द्रव कौन सा है?
(A) Peritoneal fluid
(B) Synovial fluid
(C) Cerebrospinal fluid
(D) Pericardial fluid
✅ Answer & Explanation
Sahi jawab: B) Synovial fluidExplanation: Synovial fluid contains hyaluronic acid and lubricin, secreted by the synovial membrane to nourish articular cartilage.
The organic collagen-based structural protein matrix of bones is called:
मानव हड्डियों के जैविक मैट्रिक्स में पाया जाने वाला प्रमुख प्रोटीन कौन सा है?
(A) Keratin
(B) Ossein
(C) Myosin
(D) Elastin
✅ Answer & Explanation
Sahi jawab: B) OsseinExplanation: Ossein is the collagenous organic component that gives bones tensile resilience against fracture.
Cardiac muscle tissue is characterized by being:
हृदयक पेशी (Cardiac muscle) की संरचनात्मक और कार्यात्मक प्रकृति कैसी होती है?
(A) Voluntary and unstriated
(B) Involuntary, striated, and myogenic
(C) Voluntary and multinucleated
(D) Involuntary and non-striated
✅ Answer & Explanation
Sahi jawab: B) Involuntary, striated, and myogenicExplanation: Cardiac muscle is striated with intercalated discs and self-excitable (myogenic), contracting involuntarily.
Which iron-bearing hemoprotein imparts a red hue to skeletal muscle and stores oxygen locally?
मांसपेशियों को लाल रंग देने वाला और ऑक्सीजन का संचय करने वाला वर्णक कौन सा है?
(A) Hemoglobin
(B) Myoglobin
(C) Hemocyanin
(D) Cytochrome
✅ Answer & Explanation
Sahi jawab: B) MyoglobinExplanation: Myoglobin exhibits high oxygen affinity and facilitates intracellular oxygen diffusion to mitochondria in working muscle fibers.
What is the approximate total count of skeletal muscles in the human body?
मानव शरीर में कंकाल मांसपेशियों की कुल अनुमानित संख्या कितनी है?
(A) 206
(B) 639
(C) 512
(D) 750
✅ Answer & Explanation
Sahi jawab: B) 639Explanation: The human muscular system contains approximately 639 distinct bilateral and midline skeletal muscles.
Which is anatomically recognized as the largest (most voluminous) muscle in the human body?
मानव शरीर की सबसे बड़ी (आयतन में) मांसपेशी कौन सी है?
(A) Sartorius
(B) Gluteus Maximus
(C) Latissimus dorsi
(D) Pectoralis major
✅ Answer & Explanation
Sahi jawab: B) Gluteus MaximusExplanation: Gluteus maximus forms the bulk of the buttock and produces hip extension essential for upright posture.
The longest skeletal muscle running obliquely down the anterior thigh is the:
कूल्हे से घुटने तक जाने वाली मानव शरीर की सबसे लंबी मांसपेशी कौन सी है?
(A) Rectus femoris
(B) Sartorius
(C) Gracilis
(D) Biceps femoris
✅ Answer & Explanation
Sahi jawab: B) SartoriusExplanation: The sartorius (tailor's muscle) spans both hip and knee joints to facilitate cross-legged sitting.
Which minute skeletal muscle in the middle ear is the smallest in the human body?
मानव शरीर की सबसे छोटी मांसपेशी कौन सी है, जो मध्य कान में स्थित होती है?
(A) Tensor tympani
(B) Stapedius
(C) Corrugator
(D) Anconeus
✅ Answer & Explanation
Sahi jawab: B) StapediusExplanation: The stapedius muscle dampens excess vibrations of the stapes footplate to protect the cochlea from loud noises.
Based on physiological force exerted per unit area, which is considered the strongest muscle?
दबाव और बल के संदर्भ में मानव शरीर की सबसे मजबूत मांसपेशी कौन सी मानी जाती है?
(A) Soleus
(B) Masseter
(C) Uterus
(D) Biceps brachii
✅ Answer & Explanation
Sahi jawab: B) MasseterExplanation: The masseter (jaw elevator) can generate closing forces exceeding 90 kg on the molars.
What is the specialized cytoplasm of a muscle fiber called?
मांसपेशी कोशिका (फाइबर) के कोशिका द्रव्य को क्या कहा जाता है?
(A) Sarcolemma
(B) Sarcoplasm
(C) Axoplasm
(D) Cytosol
✅ Answer & Explanation
Sahi jawab: B) SarcoplasmExplanation: Sarcoplasm is rich in glycogen granules, myoglobin, and high concentrations of myofilaments.
Which motor proteins directly interact to generate sliding-filament muscular contractions?
मांसपेशियों के संकुचन के लिए कौन से दो मुख्य संकुचनशील प्रोटीन जिम्मेदार हैं?
(A) Tubulin and dynein
(B) Actin and Myosin
(C) Collagen and elastin
(D) Keratin and fibrin
✅ Answer & Explanation
Sahi jawab: B) Actin and MyosinExplanation: Myosin cross-bridges bind actin thin filaments and undergo ATP-dependent power strokes to shorten sarcomeres.
Which tissue category encompasses blood, bone, cartilage, and loose aerolar tissues?
रक्त, हड्डी, कार्टिलेज और वसा किस ऊतक श्रेणी के अंतर्गत आते हैं?
(A) Epithelial tissue
(B) Connective tissue
(C) Muscular tissue
(D) Nervous tissue
✅ Answer & Explanation
Sahi jawab: B) Connective tissueExplanation: Connective tissues share a mesodermal origin and consist of scattered cells surrounded by an extracellular matrix.
What is the scientific term for the microscopic study of biological tissues?
ऊतकों के सूक्ष्म संरचनात्मक अध्ययन को क्या कहा जाता है?
(A) Cytology
(B) Histology
(C) Myology
(D) Osteology
✅ Answer & Explanation
Sahi jawab: B) HistologyExplanation: Histology analyzes tissue sections under light and electron microscopy for structural and diagnostic evaluations.