Tag: phanerogams

Questions Related to phanerogams

In angiosperms the number of meiotic divisions required to produce $100$ macrospores is?

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. $125$

  2. $100$

  3. $50$

  4. $25$

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Correct Option: B

External water is not required for fertilization of

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Pteriodophytes

  2. Bryophytes

  3. Thallophytes

  4. Spermatophytes

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Correct Option: D

Select the correct statements from the following.
I. Endosperm is generally triploid in angiosperms.
II. All angiosperms have monosporic and endosporic embryo sac.
III. Angiosperms are characterised by double fertilization.
IV. All angiosperms show indirect pollination and siphonogamy.

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. I, II and IV

  2. II, III and IV

  3. I, III and IV

  4. I, II, III and IV

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Correct Option: C

Which of the following is false in angiosperms?

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Egg cell - haploid

  2. Megaspore - diploid

  3. Pollen grain - haploid

  4. Synergid - haploid

  5. Endosperm - triploid

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Correct Option: B

Datura is a classical example of study of

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Monosomics

  2. Trisomics

  3. Triploids

  4. Nullisomics

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Correct Option: B
Explanation:
Trisomics are those organisms, which have an extra chromosome (2n + 1). Trisomics were obtained for the first time in Datura stramonium (jimson weed) by A.F. Blakeslee and his co-workers. Since haploid chromosome number in this species is n = 12, 12 primary trisomics, 24 secondary trisomics and a large number of tertiary trisomics are possible. Most of the trisomics were identified by size, shape and other morphological features of the fruit.
So, the correct answer is 'Trisomics'.

Which one of the following plants has ovary superior, monocarpellary and unilocular with several ovules on marginal placenta?

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Anona squamosa

  2. Datura stramonium

  3. Pisum sativum

  4. Ricinus comm unis

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Correct Option: A

Among angiosperm plants, the lowest chromosome & number is found in _________________.

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Haplopappus gracilis

  2. Crepis capillaris

  3. Arabidopsis thaliana

  4. Oenothera lamarckiana

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Correct Option: A

In angiosperms, the wall around the microspore tetrads is deposited with.

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Callose

  2. Cellulose

  3. Pectocellu lose

  4. Sporopollenin

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Correct Option: A

In angiosperms, the egg is?

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Completely surrounded by a wall

  2. Surrounded by a wall only at the micropylar end

  3. Surrounded by a wall only at the chalazae end

  4. Devoid of wall

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Correct Option: A

Which of the following characters represent the affinities of Gnetum with angiosperms and differences with Cycas and Pinus?

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Presence of xylem vessels and absence of archegonia

  2. Perianth and two integuments

  3. Embryo development and apical meristem

  4. Absence of resin ducts and leaf venation

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Correct Option: A