biology Questions

QUESTION: Which one of the following is an appropriate example of 'sexual deceit'?

QUESTION: Arrange the following cell layers/structures around the female gamete, from outer to inner side : A. Zona pellucida B. Perivitelline space C. Corona radiata D. Plasma membrane of ovum Choose the correct answer from the options given below :

QUESTION: Which of the following equations depicts Verhulst-Pearl logistic population growth ?

QUESTION: Match List I with List II : List I (Bioactive molecules) A. Streptokinase B. Statins C. Lipases D. Cyclosporin A List II (Importance) I. Immunosuppressive agent II. Removal of clots from the blood vessels III. Blood cholesterol-lowering age

QUESTION: The following reaction depicts the activity of a particular class of enzymes : X Y | | C = C ⟶ X – Y + C = C (Substrate) (Product) (Product) Identify the enzyme class 'E' from the following options :

QUESTION: In humans, respiration occurs in the following steps. Arrange these steps in the correct order. A. Diffusion of O₂ and CO₂ between blood and tissues B. Diffusion of O₂ and CO₂ across alveolar membrane C. Pulmonary ventilation by which atmos

QUESTION: In which animal do haploid cells divide mitotically to produce gametes ?

QUESTION: Choose the correct statements regarding population interactions between two species. A. In both parasitism and commensalism, only one species benefits and the other species is harmed. B. Both species benefit in mutualism. C. Both species be

QUESTION: Arrange the following events occurring in Renin-Angiotensin mechanism in the correct order : A. Increase in blood pressure and Glomerular filtration rate. B. Reabsorption of Na⁺ and water from distal parts of tubule due to Aldosterone. C. F

QUESTION: Ecological pyramids represent the relationship between the organisms at different trophic levels and they are generally inverted for :

QUESTION: Non-membrane bound cell organelles found in both prokaryotic and eukaryotic cells are ________.

QUESTION: Which of the following is not an example of convergent evolution ?

QUESTION: What is the reason behind production of large holes in 'Swiss Cheese' ?

QUESTION: Insertion of a foreign DNA at BamHI site in an E. coli cloning vector pBR322 results in the loss of antibiotic resistance towards :

QUESTION: Match List I with List II : List I A. Molluscs B. Reptiles C. Adult amphibians D. Amoeba List II I. Pulmonary respiration only II. Branchial respiration III. Cellular respiration IV. Pulmonary and Cutaneous respiration Choose the correct an

QUESTION: What is the probability of having children with 'O' blood group, where both mother and father are heterozygous for 'A' and 'B' blood group, respectively ?

QUESTION: Which of the following statements are correct with respect to DNA separation, isolation and visualization? A. The cutting of DNA is done by molecular scissors. B. The DNA fragments separate according to their size in an agarose gel, upon el

QUESTION: Match List I with List II : List-I (Process) A. Glycolysis B. ETS C. Accumulation of protons D. Krebs' cycle List-II (Location) I. Inner mitochondrial Membrane II. Mitochondrial Matrix III. Cytoplasm IV. Intermembrane space Choose the corre

QUESTION: How many ATP and NADPH molecules are required to make one molecule of glucose through the Calvin pathway ?

QUESTION: Identify the correct sequence of steps in each cycle of Polymerase Chain Reaction :

QUESTION: Match List I with List II : List-I A. Incomplete Dominance B. Codominance C. Pleiotropy D. Polygenic inheritance List-II I. Human skin colour II. Inheritance of flower colour in Antirrhinum sp. III. Phenylketonuria disease in humans IV. ABO

QUESTION: Identify the correct statements about biomolecules. A. Lipids are generally water soluble. B. Proteins are polypeptides. C. Polysaccharides are long chains of sugars. D. Adenine and guanine are substituted pyrimidines. E. Almost all enzymes

QUESTION: Match List I with List II : List-I A. Trypsin B. Morphine C. Concanavalin D. Collagen List-II I. Intercellular ground substance II. Lectin III. Enzyme IV. Alkaloid Choose the correct answer from the options given below :

QUESTION: Find the incorrect statement(s) about photosynthesis from the following : A. The water splitting complex is associated with PS-I. B. C₄ plants use the C₃ pathway of CO₂ fixation as the main biosynthetic pathway. C. In C₄ plants, photorespir

QUESTION: Which one of the following disorders is caused by the substitution of Glutamic acid (Glu) by Valine (Val) at the sixth position of the beta globin chain of the haemoglobin molecule ?

QUESTION: Which of the following statements is not true about the universal rules of binomial nomenclature?

QUESTION: Which of the following statements are correct ? A. The Amazon rainforest being cut and cleared for cultivation of soyabeans is an example of habitat loss. B. Steller's sea cow and passenger pigeon became extinct due to over-exploitation by

QUESTION: The main function of bulliform cells in grasses is :

QUESTION: Which one of the following is the site for active ribosomal RNA synthesis ?

QUESTION: Match List I with List II : List I (Placentation) A. Marginal B. Axile C. Parietal D. Basal List-II (Example) I. Mustard II. Pea III. Marigold IV. Lemon Choose the correct answer from the options given below :

QUESTION: Which of the following statements are correct with reference to packaging of DNA helix ? A. Histones are organized to form a unit of eight molecules called histone octamer. B. Histones are negatively charged basic proteins. C. Histones are

QUESTION: In which one of the following, the ovules are not enclosed by an ovary wall and remain exposed?

QUESTION: Which of the following statements are correct regarding amino acids ? A. They are substituted methanes. B. Serine is an aromatic amino acid C. Valine is a neutral amino acid D. Lysine is an acidic amino acid Choose the correct answer from t

QUESTION: Match List I with List II : List I A. Productivity B. Net primary productivity C. Gross primary productivity D. Secondary productivity List II I. Gross primary productivity minus respiration losses II. Rate of formation of new organic matte

QUESTION: Heterophyllous development in response to environment is an example of which of the following phenomena?

QUESTION: Which of the following is an in situ conservation method ?

QUESTION: Which one of the following types of pollination brings genetically different types of pollen grains to the stigma?

QUESTION: Which of the following statements are correct with reference to a transcription unit? A. A transcription unit in DNA is defined primarily by three regions: promoter, structural gene and terminator. B. The promoter is said to be located towa

QUESTION: Arrange the following steps of DNA fingerprinting in a correct sequence. A. Isolation of DNA and its digestion by restriction endonucleases. B. Hybridisation using a labelled VNTR probe. C. Transferring of separated DNA fragments to synthet

QUESTION: "The Evil Quartet" of biodiversity loss includes which of the following?

QUESTION: The main criteria used for Five Kingdom Classification proposed by R.H. Whittaker (1969) included :

QUESTION: Match List I with List II : List I A. Decomposition B. Detritus C. Mineralisation D. Humification List II I. Accumulation of dark coloured amorphous colloidal substance II. Release of inorganic nutrients by the activity of microbes in soil

QUESTION: Which one of the following is a triploid cell ?

QUESTION: Which of the following floral formula is the correct floral formula of Solanaceae family ?

QUESTION: In angiosperms, root hairs arise from which one of the following regions of the root ?

QUESTION: Match List I with List II : List I A. Conjunctive tissue B. Casparian strips C. Subsidiary cells D. Starch sheath List II I. Specialised cells in the vicinity of guard cells II. Endodermal cells rich in starch III. Tissue between xylem and

QUESTION: Arrange the following steps of somatic hybridisation in a correct sequence. A. Digestion of cell walls. B. Isolation of naked protoplasts. C. Fusion of protoplasts to get hybrid protoplast. D. Isolation of single cells from two different va

QUESTION: Which one of the following is not a characteristic of plant cells in the phase of elongation ?

QUESTION: 2(C₅H₈O₅) + 145O₂ → 102CO₂ + 98H₂O + energy The respiratory Quotient (RQ) of a biomolecule used for respiration, as per the above equation would be :

QUESTION: Match List I with List II : List I (Phase of cell cycle) A. G₁ phase B. S phase C. G₂ phase D. M phase List II (Activity) I. Actual cell division occurs II. Cell is metabolically active and continuously grows but does not replicate its DNA