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Year Questions

The correct statement with regard to the secondary structure of DNA/RNA is:

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

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

In the lac operon, the z gene codes for:

Exploring molecular, genetic and species-level diversity for products of economic importance is called:

Match List I with List II: Choose the correct answer from the options given below:

Match List I with List II: Choose the correct answer from the options given below :

Since the origin and diversification of life on Earth, there have been five episodes of mass extinction of species. How is the sixth extinction, which is in progress, different from the previous episodes?

Alpha-helix is found in which level of protein structure?

The main function of bulliform cells in grasses is:

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

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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 humans. C. The Nile perch introduced into Lake Victoria in East Africa helped in population growth of cichlid fish in the lake. D. Water hyacinth is an invasive species. E. When a species becomes extinct, the plant and animal species associated with it are not affected. Choose the correct answer from the options given below:

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 towards the 5'-end of the structural gene. C. The promoter is a DNA sequence that provides binding site for RNA polymerase. D. The promoter defines the template and coding strands. E. The terminator is located towards the 3'-end of the coding strand and it defines the end of the process of transcription. Choose the correct answer from the options given below:

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

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

2(C₅₁H₉₈C₆) + 145 O₂ → 102 CO₂ + 98 H₂O + energy The Respiratory Quotient (RQ) of a biomolecule used for respiration, as per the above equation would be:

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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 synthetic membranes. D. Detection of hybridised DNA fragments by autoradiography. E. Separation of DNA fragments by electrophoresis. Choose the correct answer from the options given below :

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 rich in the basic amino acid residues - lysine and arginine. D. The positively charged DNA is wrapped around the histone octamer to form nucleosome. E. The packaging of chromatin at higher levels requires an additional set of proteins called non-histone chromosomal proteins. Choose the correct answer from the options given below :

Find the incorrect statement(s) about photosynthesis from the following: A. The water splitting complex is associated with PS I. B. C$_4$ plants use the C$_3$ pathway of CO$_2$ fixation as the main biosynthetic pathway. C. In C$_4$ plants, photorespiration does not occur. D. C$_3$ plants exhibit 'Kranz' anatomy. E. ATP synthesis in chloroplast occurs through chemiosmosis. Choose the answer from the options given below:

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 varieties of plants. E. Growing of hybrid protoplast to form a new plant. Choose the correct answer from the options given below:

Match List-I with List-II: Choose the correct answer from the options given below :

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

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The enzyme required for carboxylation in the Calvin cycle is

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

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

Which of the following is an in situ conservation method?

Which of the following statements are not true regarding restriction endonucleases? A. They are called molecular scissors. B. These are the enzymes responsible for restricting the growth of bacteriophages in E. coli. C. They cut the DNA only at the centre of the palindromic sites. D. They remove nucleotides only from the ends of DNA fragments. E. They recognise specific palindromic base-pair sequences.

In racemose inflorescence, ________.

Arrange the following in the correct developmental sequence related to microsporogenesis: A. Microspore tetrads B. Sporogenous tissue C. Pollen grains D. Pollen mother cells Choose the correct answer from the options given below :

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 are proteins. Choose the correct answer from the options given below :

Which of the following statements are true with reference to the sex-determination in honeybees? A. An offspring formed from the union of a sperm and egg develops as a female (queen or worker). B. An unfertilized egg develops as a male by parthenogenesis. C. A male has half the number of chromosomes than that of a female. D. Males produce sperms by meiosis. E. Honeybees have a haplodiploid sex-determination system. Choose the correct answer from the options given below :

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

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 the options given below:

‘The Evil Quartet’ of biodiversity loss includes which of the following?

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Which one of the following is a triploid cell?

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

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The main criteria used for Five Kingdom Classification proposed by R.H. Whittaker (1969) included: A. Cell structure B. Body organization C. Presence of flagellum D. Reproduction E. Phylogenetic relationships Choose the correct answer from the options given below :

Match List I with List II: Choose the correct answer from the options given below :

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 electrophoresis. C. The separated DNA fragments can be seen without staining when exposed to UV light. D. The separated DNA fragments, when stained with ethidium bromide, can be seen in visible light. Choose the correct answer from the options given below :

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?

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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. Fall in glomerular filtration rate D. Vasoconstriction by Angiotensin II and release of Aldosterone E. Renin converts Angiotensinogen into Angiotensin I, followed by Angiotensin II Choose the correct answer from the options given below:

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 atmospheric air is drawn in and CO₂ rich alveolar air is released out D. Cellular respiration E. Transport of gases by the blood Choose the correct answer from the options given below:

The following are the stages of life cycle of Plasmodium. Arrange the stages in the proper order: A. The parasites reproduce asexually in RBCs, bursting the cells. B. The parasites reproduce asexually in liver cells, bursting the cells and releasing into blood. C. Gametocytes develop in RBCs. D. Sporozoites reach the liver through the blood. E. Female mosquito injects sporozoites into humans during bite. Choose the correct answer from the options given below: