PYQSide ExamsMy practice

Sexual Reproduction in Flowering Plants · Question 100

AIPMT 2008MCQEasy📈 Topic in 12% papers+4−1
1

Unisexuality of flowers prevents

  1. geitonogamy, but not xenogamy
  2. autogamy and geitonogamy
  3. autogamy, but not geitonogamy
  4. both geitonogamy and xenogamy

Answer

(3) autogamy, but not geitonogamy

Solution

Autogamy is pollination within the same flower; it needs a bisexual flower.

As per NCERT, production of unisexual flowers is a device to prevent self-pollination: if both male and female flowers are present on the same plant (monoecious, e.g., castor and maize), it prevents autogamy but not geitonogamy.

⇒ Geitonogamy (transfer to another flower of the same plant) is still possible; xenogamy is never prevented.

Answer: (3)

AIPMT 2008

Keep practising — Sexual Reproduction in Flowering Plants

2

Which one of the following is resistant to enzyme action?

  1. Pollen exine
  2. Leaf cuticle
  3. Cork
  4. Wood fibre
AIPMT 2008
3

Male gametes in angiosperms are formed by the division of

  1. generative cell
  2. vegetative cell
  3. microspore mother cell
  4. microspore
AIPMT 2007
4

Which one of the following is surrounded by a callose wall?

  1. Male gamete
  2. Egg
  3. Pollen grain
  4. Microspore mother cell
AIPMT 2007
5

Long filamentous threads protruding at the end of a young cob of maize are

  1. hairs
  2. anthers
  3. styles
  4. ovaries
AIPMT 2006
6

In a cereal grain the single cotyledon of embryo is represented by

  1. coleoptile
  2. coleorhiza
  3. scutellum
  4. prophyll.
AIPMT 2006
7

The arrangement of the nuclei in a normal embryo sac in the dicot plants is

  1. 3 + 3 + 2
  2. 2 + 4 + 2
  3. 3 + 2 + 3
  4. 2 + 3 + 3
AIPMT 2006
8

In a type of apomixis known as adventive embryony, embryos develop directly from the

  1. nucellus or integuments
  2. zygote
  3. synergids or antipodals in an embryo sac
  4. accessory embryo sacs in the ovule.
AIPMT 2005
9

Which one of the following represents an ovule, where the embryo sac becomes horse-shoe shaped and the funiculus and micropyle are close to each other?

  1. Amphitropous
  2. Circinotropous
  3. Atropous
  4. Anatropous
AIPMT 2005
10

Through which cell of the embryo sac, does the pollen tube enter the embryo sac?

  1. Egg cell
  2. Persistent synergid
  3. Degenerated synergids
  4. Central cell
AIPMT 2005
11

When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is

  1. tetraploidy
  2. pentaploidy
  3. diploidy
  4. triploidy
AIPMT 2004

All Sexual Reproduction in Flowering Plants PYQs →

PDFDownload Sexual Reproduction in Flowering Plants PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
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)