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Sexual Reproduction in Flowering Plants · Question 79

NEET 2013 (Karnataka)MCQEasy📈 Topic in 62% papers+4−1
1

Which one of the following statements is correct?

  1. Cleistogamous flowers are always autogamous.
  2. Xenogamy occurs only by wind pollination.
  3. Chasmogamous flowers do not open at all.
  4. Geitonogamy involves the pollen and stigma of flowers of different plants.

Answer

(1) Cleistogamous flowers are always autogamous.

Solution

(1) Correct: as per NCERT, cleistogamous flowers do not open at all; the anthers and stigma lie close to each other, so these flowers are invariably autogamous.

(2) Incorrect: xenogamy (cross-pollination) can be brought about by wind, water or animals.

(3) Incorrect: chasmogamous flowers have exposed anthers and stigma (they open); it is the cleistogamous flowers that do not open.

(4) Incorrect: geitonogamy is the transfer of pollen grains from the anther to the stigma of another flower of the same plant; transfer to a flower of a different plant is xenogamy.

Answer: (1)

NEET 2013 (Karnataka)

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2

Which of the following statements is correct?

  1. Sporopollenin can be degraded by enzymes.
  2. Sporopollenin is made up of inorganic materials.
  3. Sporopollenin can withstand high temperatures as well as strong acids and alkalis.
  4. Sporopollenin can withstand high temperatures but not strong acids.
NEET 2013 (Karnataka)
3

The viability of seeds is tested by :

  1. 2,3,5-triphenyl tetrazolium chloride
  2. Safranine
  3. 2,6-dichlorophenol indophenol
  4. DMSO
Out of syllabusNEET 2013 (Karnataka)
4

What is the function of germ pore?

  1. Emergence of radicle
  2. Absorption of water for seed germination
  3. Initiation of pollen tube
  4. Release of male gametes
AIPMT 2012 (Mains)
5

Which one of the following statements is wrong?

  1. When pollen is shed at two-celled stage, double fertilization does not take place.
  2. Vegetative cell is larger than generative cell.
  3. Pollen grains in some plants remain viable for months.
  4. Intine is made up of cellulose and pectin.
AIPMT 2012 (Mains)
6

Plants with ovaries having only one or a few ovules, are generally pollinated by

  1. bees
  2. butterflies
  3. birds
  4. wind
AIPMT 2012 (Mains)
7

Both, autogamy and geitonogamy are prevented in

  1. Papaya
  2. cucumber
  3. castor
  4. maize.
AIPMT 2012 (Prelims)
8

An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is

  1. cuticle
  2. sporopollenin
  3. lignin
  4. cellulose.
AIPMT 2012 (Prelims)
9

Even in absence of pollinating agents seed-setting is assured in

  1. Commelina
  2. Zostera
  3. Salvia
  4. fig.
AIPMT 2012 (Prelims)
10

In angiosperms, functional megaspore develops into

  1. embryo sac
  2. ovule
  3. endosperm
  4. pollen sac.
AIPMT 2011 (Mains)
11

What is common between vegetative reproduction and apomixis?

  1. Both are applicable to only dicot plants
  2. Both bypass the flowering phase
  3. Both occur round the year
  4. Both produce progeny identical to the parent.
AIPMT 2011 (Mains)

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All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
Class 12Reproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental Issues
Other chaptersBiomolecules (Biology)