All 49 Botany questions we hold from this paper, of the 198 on the site for this sitting — every option and the answer key. 4 marks each, −1 for a wrong answer.
45 questions, one correct option each. +4 for a correct answer, −1 for a wrong one, nothing for a blank.
Given below are two statements: one labelled as Assertion A and the other labelled as Reason R.
Assertion A: The first stage of the gametophyte in the life cycle of moss is the protonema stage.
Reason R: Protonema develops directly from spores produced in the capsule.
In the light of the above statements, choose the most appropriate answer from the options given below:
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In an angiosperm, the haploid, diploid and triploid structures of a fertilised embryo sac, sequentially, are:
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Movement and accumulation of ions across a membrane against their concentration gradient can be explained by:
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Large, colourful, fragrant flowers with nectar are seen in:
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The phenomenon of pleiotropism refers to:
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Which hormone promotes internode/petiole elongation in deep-water rice?
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Among 'The Evil Quartet', which one is considered the most important cause driving the extinction of species?
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Upon exposure to UV radiation, DNA stained with ethidium bromide will show:
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Which micronutrient is required for the splitting of the water molecule during photosynthesis?
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Axile placentation is observed in:
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The process of appearance of recombination nodules occurs at which sub-stage of prophase I in meiosis?
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The reaction centre in PS II has an absorption maximum at:
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Unequivocal proof that DNA is the genetic material was first proposed by:
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Among eukaryotes, replication of DNA takes place in:
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In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form a callus. This phenomenon may be called:
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Cellulose does not form a blue colour with iodine because:
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Spraying which of the following phytohormones on juvenile conifers helps hasten the maturity period, leading to early seed production?
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Given below are two statements:
Statement I: The forces generated by transpiration can lift a xylem-sized column of water over 130 metres in height.
Statement II: Transpiration cools leaf surfaces, sometimes by 10 to 15 degrees, by evaporative cooling.
In the light of the above statements, choose the most appropriate answer from the options given below:
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Family Fabaceae differs from Solanaceae and Liliaceae. With respect to the stamens, pick out the characteristics specific to family Fabaceae but not found in Solanaceae or Liliaceae:
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Expressed Sequence Tags (ESTs) refer to:
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Identify the correct statements:
A. Detritivores perform fragmentation.
B. The humus is further degraded by some microbes during mineralisation.
C. Water-soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching.
D. The detritus food chain begins with living organisms.
E. Earthworms break down detritus into smaller particles by a process called catabolism.
Choose the correct answer from the options given below:
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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Late wood has fewer xylary elements with narrow vessels.
Reason R: Cambium is less active in winter.
In the light of the above statements, choose the correct answer from the options given below:
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Which of the following stages of meiosis involves division of the centromere?
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The historic Convention on Biological Diversity, 'The Earth Summit', was held in Rio de Janeiro in the year:
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How many ATP and NADPH2 are required for the synthesis of one molecule of glucose during the Calvin cycle?
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In the equation GPP−R=NPP, GPP is gross primary productivity and NPP is net primary productivity. R here is ________.
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During the purification process in recombinant DNA technology, the addition of chilled ethanol precipitates out:
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What is the role of RNA polymerase III in the process of transcription in eukaryotes?
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What is the function of tassels in the corn cob?
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Identify the pair of heterosporous pteridophytes among the following:
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In the gene gun method used to introduce alien DNA into host cells, microparticles of ________ metal are used.
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Given below are two statements:
Statement I: Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
Statement II: The exarch condition is the most common feature of the root system.
In the light of the above statements, choose the correct answer from the options given below:
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The frequency of recombination between gene pairs on the same chromosome, as a measure of the distance between genes to map their position on the chromosome, was used for the first time by:
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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: ATP is used at two steps in glycolysis.
Reason R: The first ATP is used in converting glucose into glucose-6-phosphate and the second ATP is used in the conversion of fructose-6-phosphate into fructose-1,6-diphosphate.
In the light of the above statements, choose the correct answer from the options given below:
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Which one of the following statements is not correct?
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How many different proteins does the ribosome consist of?
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Which of the following statements are correct about Klinefelter's syndrome?
A. This disorder was first described by Langdon Down (1866).
B. Such an individual has overall masculine development; however, feminine development is also expressed.
C. The affected individual is short-statured.
D. Physical, psychomotor and mental development is retarded.
E. Such individuals are sterile.
Choose the correct answer from the options given below:
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Match List I with List II.
| List I | List II |
|---|---|
| A. Oxidative decarboxylation | I. Citrate synthase |
| B. Glycolysis | II. Pyruvate dehydrogenase |
| C. Oxidative phosphorylation | III. Electron transport system |
| D. Tricarboxylic acid cycle | IV. EMP pathway |
Choose the correct answer from the options given below:
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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: A flower is defined as a modified shoot wherein the shoot apical meristem changes to floral meristem.
Reason R: Internodes of the shoot get condensed to produce different floral appendages laterally at successive nodes instead of leaves.
In the light of the above statements, choose the correct answer from the options given below:
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Given below are two statements: one labelled as Assertion A and the other labelled as Reason R.
Assertion A: In gymnosperms the pollen grains are released from the microsporangium and carried by air currents.
Reason R: Air currents carry the pollen grains to the mouth of the archegonia, where the male gametes are discharged and a pollen tube is not formed.
In the light of the above statements, choose the correct answer from the options given below:
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Match List I with List II.
| List I | List II |
|---|---|
| A. Cohesion | I. More attraction in liquid phase |
| B. Adhesion | II. Mutual attraction among water molecules |
| C. Surface tension | III. Water loss in liquid phase |
| D. Guttation | IV. Attraction towards polar surfaces |
Choose the correct answer from the options given below:
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Which of the following combinations is required for chemiosmosis?
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Malonate inhibits the growth of pathogenic bacteria by inhibiting the activity of:
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Identify the correct statements:
A. Lenticels are lens-shaped openings permitting the exchange of gases.
B. Bark formed early in the season is called hard bark.
C. Bark is a technical term that refers to all tissues exterior to the vascular cambium.
D. Bark refers to the periderm and secondary phloem.
E. Phellogen is single-layered in thickness.
Choose the correct answer from the options given below:
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Match List I with List II.
| List I | List II |
|---|---|
| A. M phase | I. Proteins are synthesised |
| B.G2 phase | II. Inactive phase |
| C. Quiescent stage | III. Interval between mitosis and initiation of DNA replication |
| D.G1 phase | IV. Equational division |
Choose the correct answer from the options given below:
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Match List I with List II.
| List I (Interaction) | List II (Species A and B) |
|---|---|
| A. Mutualism | I. +(A), 0(B) |
| B. Commensalism | II. –(A), 0(B) |
| C. Amensalism | III. +(A), –(B) |
| D. Parasitism | IV. +(A), +(B) |
Choose the correct answer from the options given below:
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Given below are two statements:
Statement I: Gause's 'Competitive Exclusion Principle' states that two closely related species competing for the same resources cannot co-exist indefinitely and the competitively inferior one will be eliminated eventually.
Statement II: In general, carnivores are more adversely affected by competition than herbivores.
In the light of the above statements, choose the correct answer from the options given below:
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Match List I with List II.
| List I | List II |
|---|---|
| A. Iron | I. Synthesis of auxin |
| B. Zinc | II. Component of nitrate reductase |
| C. Boron | III. Activator of catalase |
| D. Molybdenum | IV. Cell elongation and differentiation |
Choose the correct answer from the options given below:
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