Botany

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Identify the incorrect pair. Answer: 4. Drugs - Ricin Codeine is an alkaloid - correct. Abrin is a toxin - correct. Concanavalin A is a lectin - correct. Ricin is a toxi... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
The fruit fly has 8 chromosomes (2n) in each cell. During interphase of Mitosis if the number of chromosomes at G_1 phase is 8, what would be the number of chromosomes after S phase ? Answer: 1. 8 The chromosome number does not change in S phase; only DNA content doubles, because each chromosome gets two sister chromatids... Cell cycle, mitosis, meiosis 1 answer
Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature ? Answer: 3. Diakinesis Terminalisation of chiasmata (chiasmata slide towards the ends of the bivalents) occurs in diakinesis, the last stage... Cell cycle, mitosis, meiosis 1 answer
The centriole undergoes duplication during : Answer: 1. S-phase Centrioles duplicate during the S phase of the cell cycle (in the cytoplasm, alongside DNA replication), so that two cent... Cell cycle, mitosis, meiosis 1 answer
Dobson units are used to measure thickness of : Answer: 3. Ozone Dobson units measure the thickness of the ozone layer (1 DU = 0.01 mm of pure ozone at standard temperature and pressure).... Biodiversity: concept, patterns, importance, loss 1 answer
Match List - I with List - II.List - I / List - II(a) Allen's Rule (i) Kangaroo rat(b) Physiological adaptation (ii) Desert lizard(c) Behavioural adaptation (iii) Marine fish at depth(d) Biochemical adaptation (iv) Polar sealChoose the correct answer… Answer: 3. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) Allen's rule (shorter extremities in colder climates) - polar seal (iv) Physiological adap... Population interactions: mutualism, competition, predation, parasitism 1 answer
Persons with ‘AB’ blood group are called as "Universal recipients". This is due to : Answer: 4. Absence of antibodies, anti-A and anti-B, in plasma AB blood group has antigens A and B on RBCs but has no anti-A or anti-B antib... Deviations: incomplete dominance, co-dominance, multiple alleles, blood groups, pleiotropy, polygenic inheritance 1 answer
If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it ? Answer: 3. T : 30 ; G : 20 ; C : 20 By Chargaff's rule A = T and G = C. A = 30% so T = 30%. A + T = 60%, leaving 40% for G + C, so G = C = 2... DNA as genetic material, DNA and RNA structure, DNA packaging 1 answer
Which one of the following statements about Histones is wrong ? Answer: 2. The pH of histones is slightly acidic. Histones are rich in basic amino acids lysine and arginine, which carry positive charge, s... DNA as genetic material, DNA and RNA structure, DNA packaging 1 answer
In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased ? Answer: 3. 25% Both parents are heterozygous carriers (Hb ^A Hb ^S ). Cross: Hb ^A Hb ^S × Hb ^A Hb ^S gives 1 Hb ^A Hb ^A : 2 Hb ^A Hb ^S :... Sex-linked inheritance, Mendelian and chromosomal disorders 1 answer
Which is the "Only enzyme" that has "Capability" to catalyse Initiation, Elongation and Termination in the process of transcription in prokaryotes ? Answer: 2. DNA dependent RNA polymerase In prokaryotes a single DNA-dependent RNA polymerase catalyses initiation (with sigma factor), elong... Transcription, genetic code, translation, protein biosynthesis 1 answer
Match List - I with List - II.List - I | List - II(a) Protein | (i) C=C double bonds(b) Unsaturated fatty acid | (ii) Phosphodiester bonds(c) Nucleic acid | (iii) Glycosidic bonds(d) Polysaccharide | (iv) Peptide bondsChoose the correct answer from t… Answer: 1. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) Match each biomolecule with its bond: Protein: peptide bonds, (a)-(iv). Unsaturated fatty... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Match List - I with List - II.List - I | List - II(a) S phase | (i) Proteins are synthesized(b) G2 phase | (ii) Inactive phase(c) Quiescent stage | (iii) Interval between mitosis and initiation of DNA replication(d) G1 phase | (iv) DNA replicationCho… Answer: 3. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) Match each phase: S phase: DNA replication, (a)-(iv). G2 phase: proteins are synthesised f... Cell cycle, mitosis, meiosis 1 answer
The organelles that are included in the endomembrane system are : Answer: 2. Endoplasmic reticulum, Golgi complex, Lysosomes and Vacuoles The endomembrane system includes organelles whose functions are coor... Endomembrane system: ER, Golgi, lysosomes, vacuoles 1 answer
Which of the following statements is correct ? Answer: 2. Fusion of protoplasms between two motile on non-motile gametes is called plasmogamy. Check each statement. Fusion of two cells is... Monera, Protista and Fungi 1 answer
In the exponential growth equation N_t=N_0e^rt, e represents : Answer: 3. The base of natural logarithms In N_t=N₀e^rt , e is Euler's number (about 2.718), the base of natural logarithms. The other names... Population attributes: growth, birth and death rate, age distribution 1 answer
DNA fingerprinting involves identifying differences in some specific regions in DNA sequence, called as : Answer: 2. Repetitive DNA DNA fingerprinting identifies differences in specific regions of DNA called repetitive DNA. These regions, such as... Human genome project and DNA fingerprinting 1 answer
Identify the correct statement. Answer: 2. RNA polymerase binds with Rho factor to terminate the process of transcription in bacteria. Check each statement. Capping adds me... Transcription, genetic code, translation, protein biosynthesis 1 answer
What is the role of RNA polymerase III in the process of transcription in eukaryotes ? Answer: 2. Transcribes tRNA, 5s rRNA and snRNA In eukaryotes: RNA polymerase I transcribes 28S, 18S and 5.8S rRNA; RNA polymerase II transcr... Transcription, genetic code, translation, protein biosynthesis 1 answer
Which of the following RNAs is not required for the synthesis of protein ? Answer: 4. siRNA Protein synthesis (translation) needs mRNA (template), tRNA (carries amino acids) and rRNA (ribosome structure and catalysi... Transcription, genetic code, translation, protein biosynthesis 1 answer
Which of the following statements is incorrect ? Answer: 4. Cyclic photophosphorylation involves both PS I and PS II. Find the incorrect statement. Cyclic photophosphorylation involves only... Light reactions, cyclic and non-cyclic photophosphorylation, chemiosmosis 1 answer
Match Column - I with Column - II.Column - I | Column - II(a) Nitrococcus | (i) Denitrification(b) Rhizobium | (ii) Conversion of ammonia to nitrite(c) Thiobacillus | (iii) Conversion of nitrite to nitrate(d) Nitrobacter | (iv) Conversion of atmosphe… Answer: 1. (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii) Match each bacterium with its role: Nitrococcus converts ammonia to nitrite: (a)-(ii). Rhi... Seed germination, phases and rate of growth, conditions of growth 1 answer
Which of the following statements is incorrect ? Answer: 2. In ETC (Electron Transport Chain), one molecule of NADH+H ^+ gives rise to 2 ATP molecules, and one FADH ₂ gives rise to 3 ATP mo... TCA cycle and electron transport system, ATP yield 1 answer
In some members of which of the following pairs of families, pollen grains retain their viability for months after release ? Answer: 4. Rosaceae ; Leguminosae Pollen viability depends on the family. In cereals such as Poaceae it is lost within 30 minutes. In some m... Pollination: types, agencies, examples 1 answer

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