This includes questions from Class 11 Biology chapters.
Q 1: Select the correct pair.
(1) Solanaceae – Order
(2) Musca – Genus
(3) Felis – Family
(4) Mammalia - Phylum
✅ (2) Musca – Genus
▶️ Solanaceae is a family. (A term ending in - aceae will be a plant Family).
▶️ Felis is a Genus.
▶️ Mammalia is a Class.
Q 2: Which of the following statements is incorrect about Two-Kingdom classification?
(1) It is proposed by Carl Linnaeus.
(2) It included Bacteria & cyanobacteria under Kingdom Plantae.
(3) It included the unicellular and the multicellular organisms in different group.
(4) It did not differentiate between the heterotrophic fungi and the autotrophic green plants.
✅ (3) It included the unicellular and the multicellular organisms in different group.
▶️ According to Two-Kingdom classification, the unicellular and the multicellular organisms are included under same group.
▶️ Other statements are correct regarding Two-Kingdom classification.
Q 3: Algin and Carrageen are Hydrocolloids (water holding substances) produced from
(1) Red algae and Brown algae respectively
(2) Green algae and Red algae respectively
(3) Brown algae and Red algae respectively
(4) Red algae and Green algae respectively.
✅ (3) Brown algae and Red algae respectively
▶️ Algin is produced by brown algae, such as kelp and seaweed.
▶️ Carrageen is produced by red algae, such as Irish moss and laver.
Q 4: Bilateral symmetry is observed in
(1) Flatworms to chordates except adult molluscs
(2) Flatworms to chordates except larval molluscs
(3) Flatworms to chordates except adult echinoderms
(4) Flatworms to chordates except larval echinoderms
✅ (3) Flatworms to chordates except adult echinoderms
▶️ Adult echinoderms have radial symmetry whereas larval echinoderms have bilateral symmetry.
▶️ Poriferans are mostly asymmetrical.
▶️ Some poriferans, all cnidarians and ctenophores have radial symmetry.
Q 5: Roots are the underground part of a plant formed from
(1) Plumule
(2) Radicle
(3) Nodes
(4) Internodes
✅ (2) Radicle
▶️ Plumule develops to stem.
▶️ Nodes are the regions of the stem where leaves are born.
▶️ Internodes are the portions between two nodes.
Q 6: In leaves, the ground tissue consists of thin-walled chloroplast containing cells called
(1) Guard cells
(2) Bundle sheath cells
(3) Bulliform cells
(4) Mesophyll cells
✅ (4) Mesophyll cells
▶️ Guard cells are found in stomata.
▶️ In leaves, vascular bundles are surrounded by a layer of thick-walled bundle sheath cells.
▶️ In grasses, certain adaxial epidermal cells along the veins modify into large, empty, colourless cells called bulliform cells.
Q 7: Which is not the part of female reproductive system of frog?
(1) Bidder’s canal
(2) Ovaries
(3) Cloaca
(4) Oviducts
✅ (1) Bidder’s canal
In male frogs, Vasa efferentia arise from testes. They enter the kidneys and open into Bidder’s canal. It communicates with urinogenital duct that comes out of the kidneys and opens into cloaca.
Q 8: Cell theory was formulated by
(1) Matthias Schleiden & Theodore Schwann
(2) Rudolf Virchow
(3) Anton van Leeuwenhoek
(4) Robert Brown
✅ (1) Matthias Schleiden & Theodore Schwann
▶️ Rudolf Virchow explained that cells divide and new cells are formed from pre-existing cells (Omnis cellula-e cellula).
▶️ Anton Von Leeuwenhoek: First observed and described a live cell.
▶️ Robert Brown: Discovered cell nucleus.
Q 9: In which of the following sets, are all polysaccharides?
(1) Glycogen, sucrose, maltose
(2) Glycogen, Inulin, starch
(3) Starch, Sucrose, glycogen
(4) Cellulose, starch, lactose
✅ (2) Glycogen, Inulin, starch
▶️ Glycogen, starch & Cellulose: Polymers of glucose.
▶️ Inulin: Polymer of fructose (Note: Don't confuse it with Insulin. It is a protein hormone. i.e., polymer of amino acids)
▶️ Sucrose, Maltose and lactose are disaccharides.
Q 10: Duration of cell cycle in a typical eukaryotic cell such as human cell is about
(1) 24 minutes
(2) 90 minutes
(3) 24 hours
(4) 90 hrs
✅ (3) 24 hours
▶️ The life period of a cell during which a cell synthesizes DNA (replication), grows and divides into 2 daughter cells is called Cell cycle.
▶️ Duration of cell cycle in Yeasts, is 90 minutes.
Q 11: Variegated leaf experiment using starch shows that
(1) Photosynthesis occurs only in green parts of the leaves in presence of light.
(2) CO2 is required for photosynthesis.
(3) Glucose is produced when plants grow and it is usually stored as starch.
(4) Glucose is made in the green parts of plants.
✅ (1) Photosynthesis occurs only in green parts of the leaves in presence of light.
The half-leaf experiment proves that CO2 is required for photosynthesis.
Q 12: Glycolysis (EMP pathway) is the
(1) Complete oxidation of glucose to 2 molecules of pyruvic acid (C3H4O3) in the absence of O2.
(2) Partial oxidation of glucose to 2 molecules of pyruvic acid (C3H4O3) in the absence of O2.
(3) Partial oxidation of glucose to 4 molecules of pyruvic acid (C3H4O3) in the presence of O2.
(4) Complete oxidation of glucose to 2 molecules of pyruvic acid (C3H4O3) in the presence of O2.
✅ (2) Partial oxidation of glucose to 2 molecules of pyruvic acid (C3H4O3) in the absence of O2.
▶️ In glycolysis, 4 ATP molecules are directly synthesised from one glucose molecule.
▶️ ATP is utilized at 2 steps:
1) In the conversion of glucose into glucose 6-phosphate.
2) In the conversion of fructose 6-phosphate to fructose 1, 6-diphosphate.
Q 13: Under certain conditions, living specialized cells regain the capacity of division. It is called
(1) Differentiation
(2) Development
(3) Redifferentiation
(4) Dedifferentiation
✅ (4) Dedifferentiation
▶️ The process in which the cells in meristems and cambium differentiate and mature to perform specific functions. It is called differentiation.
▶️ The dedifferentiated cells again lose the capacity to divide but mature to perform specific functions. It is called redifferentiation.
▶️ Sum of growth and differentiation is called development.
Q 14: During inspiration
(1) Diaphragm contracts and external intercostal muscles relax
(2) Diaphragm relaxes and external intercostal muscles contract
(3) Diaphragm and external intercostal muscles contract
(4) Diaphragm and external intercostal muscles relax
✅ (3) Diaphragm and external intercostal muscles contract
▶️ During inspiration, the diaphragm contracts (flattens) causing an increase in vertical thoracic volume (antero-posterior axis).
▶️ Contraction of external intercostal muscles (muscles found between ribs) lifts up the ribs and sternum causing an increase in thoracic volume in the dorso-ventral axis.
Q 15: Which is not true regarding RBC?
(1) Count: 5 to 5.5 billion/ mm3.
(2) Formed in Red Bone marrow
(3) Average lifespan: 120 days
(4) Function: CO2 and O2 transports
✅ (1) Count: 5 to 5.5 billion/ mm3.
▶️ Normal count of RBC = 5 - 5.5 millions/ mm3.
▶️ Normal count of WBC = 6000-8000 /mm3.
▶️ Normal count of platelets = 1.5 - 3.5 lakhs /mm3.
Q 16: Which of the following animals is not ureotelic?
(1) Pigeon
(2) Tiger
(3) Frog
(4) Shark
✅ (1) Pigeon
▶️ All birds, terrestrial reptiles, land snails & insects are Uricotelic.
▶️ Cartilaginous fishes, terrestrial amphibians, aquatic reptiles, mammals etc. are Ureotelic.
▶️ Aquatic invertebrates, aquatic insects, bony fishes, aquatic amphibians etc. are Ammonotelic.
Q 17: The calcium receptive protein of the muscle is
(1) Myosin
(2) Actin
(3) Tropomyosin
(4) Troponin
✅ (4) Troponin
▶️ Myosin, Actin, Tropomyosin & Troponin are the key proteins present in muscle fibres.
▶️ Myosin forms thick filaments.
Actin forms thin filaments.
▶️ Tropomyosin regulates myosin binding sites on actin.
▶️ Troponin has three subunits- one subunit binds to calcium ion.
Q 18: Following are some statements related to neurons. Select the false statement.
(1) The cell body and dendrites contain certain granular bodies called Nissl’s granules.
(2) Dendrites transmit impulses towards the cell body.
(3) Schwann cells are seen only in myelinated neuron.
(4) Myelinated nerve fibres are found in spinal and cranial nerves.
✅ (3) Schwann cells are seen only in myelinated neuron.
▶️ In myelinated nerve fibres, Schwann cells form a myelin sheath around the axon.
▶️ In non-myelinated nerve fibres, Schwann cells are present but no myelin sheath.
▶️ Nissl's granules are specialized structures present in neuron which help in protein synthesis.
Q 19: GnRH stimulates
(1) Gonads
(2) Pituitary
(3) Hypothalamus
(4) Adrenal cortex
✅ (2) Pituitary
▶️ Gonadotropin releasing hormone (GnRH) is released by Hypothalamus.
▶️ It stimulates Pituitary to release gonadotropins (FSH & LH).
▶️ Gonadotropins stimulate gonadal (testis and ovary) activities.
Q 20: Gigantism and acromegaly are due to
(1) Hyperpituitarism
(2) Hypopituitarism
(3) Hyperthyroidism
(4) Hypothyroidism
✅ (1) Hyperpituitarism
▶️ Hyperpituitarism: Over secretion of pituitary hormones like Growth hormone (GH). E.g., Gigantism, Acromegaly.
▶️ Hypopituitarism: Hyposecretion of pituitary hormones. E.g., Dwarfism.
Hyperthyroidism: Over secretion of thyroid hormones. E.g., Exophthalmic goitre.
▶️ Hypothyroidism: Hyposecretion of thyroid hormones. E.g., Goitre.