These free Class 11 Biology tests are built for the 2026-27 session, and follow the CBSE pattern. Submit a test, and your score appears at once - no waiting around.
Class 11 Biology Online Practice, Chapter-wise
These tests cover Biology chapter by chapter for Class 11, written by teachers to match the CBSE 2026-27 marking pattern. Start any chapter with one click - no login, and take it as many times as you like.
Class 11 Biology: Concept Navigators & Chapter Diagnostic Tests Select any chapter below to use real-time biology explorers and solve high-yield CBSE diagnostic questions with verified explanations. Interactive Concept Tool: Taxonomic Hierarchy Explorer Q1.Who is known as the "Father of Taxonomy" for developing the binomial nomenclature system? Answer: (b) Carolus Linnaeus. He established the two-word (binomial) naming system consisting of genus and species, e.g., Mangifera indica. Q2.The taxonomic category that is common to a group of related species is called: Answer: (c) Genus. A genus is a group of closely related species that share more characteristics with each other than with species from other genera. Q3.A place where dried, pressed plant specimens are stored for future reference is called a(n): Answer: (a) Herbarium. Herbaria serve as reference repositories used to verify plant identity and study taxonomy. Interactive Concept Tool: Five Kingdom Feature Explorer Q1.The Five Kingdom classification system was proposed by: Answer: (c) R.H. Whittaker. He proposed Monera, Protista, Fungi, Plantae, and Animalia in 1969, based on cell structure, nutrition mode, and body organization. Q2.Bacteria belong to which kingdom? Answer: (a) Monera. Bacteria are prokaryotic organisms, lacking a defined nucleus and membrane-bound organelles, placing them uniquely in kingdom Monera. Q3.Viruses are generally considered non-living outside a host cell because they: Answer: (b) Lack their own metabolic machinery and cannot reproduce independently. Viruses are obligate intracellular parasites, inert outside a living host cell. Interactive Concept Tool: Plant Group Feature Explorer Q1.Bryophytes are often called the "amphibians of the plant kingdom" because: Answer: (a) They need water for fertilization, but can live on land. Like amphibians, bryophytes can survive in moist terrestrial habitats but depend on water for sperm motility during reproduction. Q2.Gymnosperms are distinguished from angiosperms mainly because their seeds are: Answer: (c) Naked, not enclosed within a fruit. "Gymnosperm" literally means "naked seed" — the ovules are not enclosed in an ovary, unlike in angiosperms. Q3.Pteridophytes (like ferns) reproduce and disperse primarily via: Answer: (b) Spores. Pteridophytes are the first true land plants with vascular tissue but still rely on spores, not seeds, for reproduction. Interactive Concept Tool: Animal Phylum Feature Explorer Q1.Which phylum is the largest in the Animal Kingdom, comprising insects, crustaceans, and arachnids? Answer: (d) Arthropoda. Arthropoda accounts for roughly two-thirds of all named animal species, characterized by a jointed exoskeleton made of chitin. Q2.The defining characteristic of phylum Chordata, present at some stage of development, is the: Answer: (a) Notochord. All chordates possess a notochord, a dorsal hollow nerve cord, and paired pharyngeal gill slits at some stage of their life. Q3.Animals of phylum Porifera are commonly known as: Answer: (c) Sponges. Poriferans have a porous body with a unique water canal system and specialized cells called choanocytes for feeding. Interactive Concept Tool: Plant Part Modification Explorer Q1.The arrangement of leaves on a stem or branch is called: Answer: (b) Phyllotaxy. Common types include alternate, opposite, and whorled phyllotaxy, describing how leaves are positioned around the stem. Q2.A fibrous root system is typically found in which type of plants? Answer: (a) Monocotyledons (e.g., grasses). Monocots typically have fibrous roots arising from the base of the stem, while dicots usually have a taproot system. Q3.The female reproductive part of a flower is called the: Answer: (c) Pistil (Gynoecium). It consists of the stigma, style, and ovary; the stamen is the male reproductive part. Interactive Concept Tool: Plant Tissue Explorer Q1.Which tissue is primarily responsible for the conduction of water and minerals in plants? Answer: (b) Xylem. Xylem transports water and dissolved minerals upward from roots to other plant parts; phloem transports food (mainly sucrose). Q2.Tissues that have permanently lost the ability to divide are called: Answer: (c) Permanent tissues. These arise from meristematic tissue but have become differentiated and lost the capacity to divide further. Q3.The main function of phloem tissue is to transport: Answer: (a) Food (organic nutrients) throughout the plant. Unlike xylem (unidirectional, upward), phloem transport is bidirectional, moving food from source to sink. Interactive Concept Tool: Animal Tissue Explorer Q1.Which tissue lines the inner surface of the gut and covers the outer surface of the body? Answer: (a) Epithelial tissue. This protective tissue forms a continuous, tightly-packed layer covering the body surface and lining internal cavities. Q2.Cardiac muscle tissue is characterized by: Answer: (c) Involuntary control, striated, and branched fibers. Cardiac muscle is unique in combining striations (like skeletal muscle) with involuntary control (like smooth muscle). Q3.The functional and structural unit of nervous tissue is the: Answer: (b) Neuron. Neurons are specialized cells that transmit electrical and chemical signals throughout the nervous system. Interactive Concept Tool: Cell Organelle Function Explorer Q1.Which organelle is known as the "powerhouse of the cell"? Answer: (c) Mitochondria. Mitochondria generate ATP through cellular respiration, providing the energy currency for the cell's activities. Q2.Which organelles are called "suicide bags" of the cell? Answer: (a) Lysosomes. Lysosomes contain hydrolytic enzymes that can digest the cell's own components (autolysis) if the lysosomal membrane ruptures. Q3.The key structural difference between prokaryotic and eukaryotic cells is: Answer: (b) Presence or absence of a membrane-bound nucleus. Eukaryotic cells have a true, membrane-enclosed nucleus; prokaryotic cells have a nucleoid region without a surrounding membrane. Interactive Concept Tool: Biomolecule Explorer Q1.Proteins are polymers made up of monomer units called: Answer: (b) Amino acids. Amino acids link via peptide bonds to form polypeptide chains, which fold into functional proteins. Q2.Which biomolecule serves as the primary long-term energy storage molecule in animals? Answer: (c) Fat (Lipid). Fats store roughly twice the energy per gram compared to carbohydrates, making them efficient for long-term energy storage. Q3.Enzymes are biological catalysts that are chemically composed mostly of: Answer: (a) Proteins. Enzymes speed up biochemical reactions by lowering activation energy, without being consumed themselves. Interactive Concept Tool: Cell Cycle Phase Explorer Q1.DNA replication occurs during which phase of the cell cycle? Answer: (b) S phase. The Synthesis (S) phase of interphase is when the cell duplicates its DNA content before entering mitosis. Q2.During which stage of mitosis do chromosomes align at the cell's equatorial plate? Answer: (c) Metaphase. Chromosomes align at the metaphase plate, attached to spindle fibers, prior to separation in anaphase. Q3.Meiosis results in the formation of how many daughter cells from one parent cell, and with what chromosome number? Answer: (a) Four daughter cells, each haploid (n). Meiosis involves two successive divisions, halving the chromosome number to produce gametes for sexual reproduction. Interactive Concept Tool: Light vs. Dark Reaction Explorer Q1.The light reactions of photosynthesis occur in which part of the chloroplast? Answer: (b) Thylakoid membrane. Chlorophyll and photosystems embedded in the thylakoid membrane capture light energy to produce ATP and NADPH. Q2.The primary CO₂ acceptor in the Calvin Cycle (C3 pathway) is: Answer: (a) RuBP (Ribulose 1,5-bisphosphate). RuBP combines with CO₂ via the enzyme RuBisCO to initiate carbon fixation in C3 plants (PEP is the acceptor in C4 plants). Q3.The splitting of water molecules during the light reaction, releasing oxygen, is called: Answer: (c) Photolysis. This light-driven splitting of water provides electrons to replace those lost by chlorophyll and releases O₂ as a byproduct. Interactive Concept Tool: Respiration Pathway Explorer Q1.Glycolysis, the breakdown of glucose into pyruvate, occurs in the: Answer: (a) Cytoplasm. Glycolysis is an anaerobic pathway occurring in the cytosol, common to both aerobic and anaerobic respiration. Q2.In anaerobic respiration (fermentation) in yeast, pyruvate is converted into: Answer: (b) Ethanol and CO₂. Yeast performs alcoholic fermentation, while muscle cells under low oxygen produce lactic acid instead. Q3.The maximum ATP yield from the complete aerobic oxidation of one glucose molecule occurs primarily during: Answer: (c) Electron Transport Chain (oxidative phosphorylation). The ETC generates the bulk of ATP by using the energy from NADH and FADH₂ to pump protons and drive ATP synthase. Interactive Concept Tool: Plant Hormone Explorer Q1.Which plant hormone is primarily responsible for fruit ripening? Answer: (d) Ethylene. This gaseous hormone triggers ripening and is also involved in abscission (leaf/fruit fall) and senescence. Q2.Abscisic acid (ABA) is often called the "stress hormone" because it: Answer: (a) Promotes stomatal closure and dormancy under unfavorable conditions. ABA generally acts as a growth inhibitor, helping plants cope with drought and other stresses. Q3.Which hormone is primarily responsible for cell elongation and phototropism (bending toward light)? Answer: (b) Auxin. Auxin accumulates on the shaded side of a shoot, promoting greater cell elongation there and causing the shoot to bend toward light. Interactive Concept Tool: Respiratory Volume Explorer Q1.Most oxygen is transported in the blood in the form of: Answer: (c) Oxyhaemoglobin (bound to haemoglobin in RBCs). About 97% of oxygen is transported this way; only a small fraction dissolves directly in plasma. Q2.The exchange of gases between alveoli and blood occurs mainly by the process of: Answer: (a) Simple diffusion. Gases move from a region of higher partial pressure to lower partial pressure across the thin alveolar-capillary membrane. Q3.The respiratory centre that primarily regulates the rhythm of breathing is located in the: Answer: (b) Medulla oblongata. This brainstem region houses the primary respiratory rhythm centre, with a secondary pneumotaxic centre in the pons fine-tuning it. Interactive Concept Tool: Blood Component Explorer Q1.The heartbeat originates from a specialized region called the: Answer: (c) Sinoatrial (SA) node. Known as the "pacemaker" of the heart, it initiates the electrical impulse that sets the heart's rhythm. Q2.A normal healthy adult's resting blood pressure is approximately: Answer: (a) 120/80 mmHg. 120 refers to systolic pressure (during heart contraction) and 80 to diastolic pressure (during heart relaxation). Q3.Which blood cells play the primary role in blood clotting? Answer: (b) Platelets. Platelets aggregate at the site of an injury and release clotting factors that trigger the coagulation cascade. Interactive Concept Tool: Nephron Part Explorer Q1.Humans primarily excrete nitrogenous waste in the form of: Answer: (c) Urea. Humans are ureotelic, converting toxic ammonia into less toxic urea in the liver before excretion via the kidneys. Q2.The process of filtration of blood in the nephron occurs at the: Answer: (a) Glomerulus (in the Bowman's capsule). Blood pressure forces water and small solutes out of glomerular capillaries into the Bowman's capsule, forming filtrate. Q3.The hormone that regulates water reabsorption in the kidneys, especially at the collecting duct, is: Answer: (d) ADH (Antidiuretic Hormone / Vasopressin). Released by the pituitary gland, ADH increases water reabsorption, concentrating urine and conserving body water. Interactive Concept Tool: Muscle Type Explorer Q1.The protein filaments primarily responsible for muscle contraction are: Answer: (b) Actin and myosin. According to the sliding filament theory, myosin (thick filament) heads pull on actin (thin filament) to shorten the sarcomere during contraction. Q2.The joint between the atlas and axis vertebrae, allowing head rotation, is an example of a: Answer: (c) Pivot joint. A pivot joint allows rotational movement around a single axis, as seen when turning the head side to side. Q3.The total number of bones in the adult human skeleton is: Answer: (a) 206. Infants are born with around 270 bones, some of which fuse together during growth, leaving 206 in adulthood. Interactive Concept Tool: Neuron Part Explorer Q1.The junction between two neurons, where a nerve impulse passes via chemical messengers, is called a: Answer: (b) Synapse. Neurotransmitters released from the presynaptic neuron cross the synaptic cleft to transmit the signal to the next neuron. Q2.The part of the human brain responsible for coordinating voluntary movements and maintaining balance is the: Answer: (c) Cerebellum. Often called the "small brain," the cerebellum fine-tunes motor movements and is essential for posture, balance, and coordination. Q3.A quick, involuntary response to a stimulus, bypassing conscious brain processing, is called a: Answer: (a) Reflex action. Reflex actions are controlled by the spinal cord via a reflex arc, allowing a rapid response (e.g., withdrawing a hand from a hot object) without waiting for the brain. Interactive Concept Tool: Endocrine Gland Explorer Q1.The pituitary gland is often called the "master gland" because it: Answer: (b) Regulates the activity of most other endocrine glands. The pituitary secretes trophic hormones that control the thyroid, adrenal glands, and gonads. Q2.Insulin, which lowers blood glucose levels, is secreted by which cells of the pancreas? Answer: (c) Beta cells. Beta cells of the Islets of Langerhans secrete insulin; alpha cells secrete glucagon, which raises blood glucose. Q3.The adrenal medulla secretes which "fight or flight" hormone in response to stress? Answer: (a) Adrenaline (Epinephrine). This hormone rapidly increases heart rate, blood pressure, and blood glucose to prepare the body for an immediate stress response. |
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