Tag: botany

Questions Related to botany

Choose the correct answer from the alternatives given.
Radial vascular bundles are found in:

botany root - external morphology zones of the root morphology of root root system in plants

  1. dicot root

  2. monocor root

  3. dicot stem

  4. both dicot and monocot roots

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Correct Option: D

In a homozygous plant self-pollination

self pollination asexual and sexual reproduction in plants botany

  1. Is never possible

  2. Yields progeny which are highly gentically variable

  3. Yields progeny which are not genetically variable

  4. Is generally overcome by various adaptations

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Correct Option: C
Explanation:

self-pollination causes an increase in homozygosity in progeny in every generation of selfing up to approximately 96% in the F5, and selfing of homozygous line produce genetically similar progeny with negligible or little variability. So, the correct option is C. ( Yields progeny which are not genetically variable )

Maturation of anthers and stigma at the same time is?

self pollination asexual and sexual reproduction in plants botany

  1. Allogamy

  2. Xenogamy

  3. Homogamy

  4. Dichogamy

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Correct Option: C

A tobacco plant which is heterozygous for albinism (a recessive character) is self pollinated if 1200 seeds are subsequently germinated, how many of the seedlings would have the parental genotype

self pollination asexual and sexual reproduction in plants botany

  1. 300

  2. 600

  3. 900

  4. 1200

Show answer
Correct Option: B
Explanation:

XX X Xx ...      Parents

I

XX Xx Xx xx ...     Fl hybrid

In Fl generation half of the total offsprings represent 
parental genotype i.e., Xx. Therefore out of 1200 seedling 600 will have parental genotype.

In cleistogamous flowers

self pollination asexual and sexual reproduction in plants botany

  1. Both geitonogamy and xenogamy are not possible

  2. Only xenogamy is not possible

  3. Only geitonogamy is not possible

  4. Both geitonogamy and xenogamy are possible

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Correct Option: A
Explanation:

Cleistogamy is a type of automatic self-pollination of certain plants that can propagate by using non-opening, self-pollinating flowers. Since geitonogamy is the fertilization of a flower by pollen from another flower on the same (or a genetically identical) plant and geitonogamy is the fertilization of a flower by pollen from a flower on a genetically different plant and it is known that a cleistogamous flower is unable to pollinate via any of these methods. So, the correct option is "A" (Both geitonogamy and xenogamy are not possible).

Repeated self pollination over the generations produces.

self pollination asexual and sexual reproduction in plants botany

  1. New varieties

  2. Elimination of weak traits

  3. Better progeny

  4. Weak progeny

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Correct Option: D

Effect of pollen on character of pericarp and seed coat is?

self pollination asexual and sexual reproduction in plants botany

  1. Xenia

  2. Metaxenia

  3. Ruminate endosperm

  4. Chimera

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Correct Option: B

Which of the following statement is correct?

self pollination asexual and sexual reproduction in plants botany

  1. Chasmogamous flowers always exhibit geitonogamy

  2. Cleistogamous flowers always exhibit autogamy

  3. Chasmogamous flowers never exhibit autogamy

  4. Cleistogamous flowers exhibit both autogamy and geitonogamy

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Correct Option: B

In sunflower, self pollination is avoided by _________.

self pollination asexual and sexual reproduction in plants botany

  1. Protogyny

  2. Unisexuality

  3. Self sterility

  4. Protandry

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Correct Option: D
Explanation:

A state in androgynous frameworks that is described by the improvement of male organs or development of their items previously the presence of the relating female item hence restraining self-treatment and that is experienced generally in mints, vegetables, and composites.
So, the correct option is 'Protandry'.

In which one of the following plant species can self-pollination never occur either naturally or artificially?

self pollination asexual and sexual reproduction in plants botany

  1. Zen mays

  2. Gossypium hirsutum

  3. Saccharum officinarum

  4. Carica papaya

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Correct Option: A