Class XI & XII · Biology practice
Botany PYQs Check your understanding, bookmark questions and revisit your mistakes.
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408 questions in this collection · Page 39 of 41
Sexual Reproduction In Flowering Plants
Which one of the following types of pollination brings genetically different types of pollen grains to the stigma?
A Geitonogamy B Xenogamy C Cleistogamy D Autogamy
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Xenogamy is pollination between flowers of different plants of the same species and introduces genetically different pollen grains.
Biodiversity And Conservation
Which of the following is an in situ conservation method?
A Seed Banks B Sacred Groves C Botanical Gardens D Wildlife Safari Parks
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Sacred groves conserve biodiversity in their natural habitats and are examples of in situ conservation.
Plant Growth And Development
Heterophyllous development in response to environment is an example of which of the following phenomena?
A Redifferentiation B Dedifferentiation C Elasticity D Plasticity
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Plasticity is the ability of plants to produce different structures in response to environmental conditions. Heterophylly is a classic example.
Biomolecules
Which of the following statements are correct regarding amino acids?
A A and B only B C and D only C B and C only D A and C only
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Amino acids are substituted methanes. Valine is a neutral amino acid. Serine is a hydroxy amino acid, and lysine is a basic amino acid.
Plant Kingdom
In which one of the following, the ovules are not enclosed by an ovary wall and remain exposed?
A Pinus B Wolffia C Funaria D Cycas
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Gymnosperms such as Pinus bear naked ovules that are not enclosed within an ovary. Angiosperms have enclosed ovules, while bryophytes do not produce ovules.
Molecular Basis Of Inheritance
Which of the following statements are correct with reference to packaging of DNA helix?
A B, D and E only B A, B and D only C C, D and E only D A, C and E only
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Histones form an octamer and are rich in lysine and arginine. DNA is negatively charged, while histones are positively charged. Higher-order chromatin packaging requires non-histone chromosomal proteins.
Morphology Of Flowering Plants
Match List-I with List-II:
List-I (Placentation) List-II (Example) A. Marginal I. Mustard B. Axile II. Pea C. Parietal III. Marigold D. Basal IV. Lemon
A A-II, B-IV, C-I, D-III B A-IV, B-II, C-I, D-III C A-III, B-I, C-IV, D-II D A-I, B-III, C-II, D-IV
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Marginal placentation occurs in pea, axile in lemon, parietal in mustard and basal in marigold.
Cell The Unit Of Life
Which one of the following is the site for active ribosomal RNA synthesis?
A Nucleolus B Kinetochore C Centrosome D Chromatin
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The nucleolus is the site of ribosomal RNA (rRNA) synthesis and ribosome assembly.
Anatomy Of Flowering Plants
The main function of bulliform cells in grasses is:
A To perform photosynthesis B To minimize water loss during water stress C To make the leaf impermeable to fungal spores D To facilitate gaseous exchange
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Bulliform cells lose water during drought, causing leaf rolling and thereby reducing transpiration.
The Living World
Which one of the following statements is not true about the universal rules of binomial nomenclature?
A The first word in the biological name represents the specific epithet, while the second component denotes the genus. B The specific epithet in the biological name starts with a small letter. C Both the words in a biological name, when handwritten, are separately underlined and printed in italics. D Biological names are generally in Latin.
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In binomial nomenclature, the first word represents the genus and the second word represents the specific epithet.
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