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 Multiple Choice QuestionsMultiple Choice Questions


How many haploid nuclei are present in a mature pollen grain

  • One

  • Two

  • Three

  • Four


Sporopollenin is a constituent of pollen exine. It can be degraded by the action of

  • enzymes

  • high temperature

  • strong acids

  • cannot be degraded


The pollen grains of rice and wheat lose their viability inminutes of their release

  • 30

  • 10

  • 60

  • 90


After doble fertilization, a mature ovule has

  • 1 diploid and 1 haploid cell

  • 1 diploid and 1 triploid cell

  • 2 haploid and 1 triploid cell

  • 1 haploid and 1 triploid cell


Plants with inferior ovary usually bear

  • pseudocarps

  • berries

  • aggregate fruits

  • seedless fruits


Which of the following is not true for inbreeding?

  • It causes inbreeding depression after a few generations

  • It always increases the productivity.

  • It is used to produce a pure line.

  • It leads to homozygosity


The given figure shows L.S of the seed of maize. What do A, B, C and D represent?

  • A : endosperm, B : scutellum, C : plumule, D : coleoptile

  • A : scutellum, B : pericarp, C : radicle, D : coleoptile

  • A : endosperm, B : scutellum, C : radicle, D : coleorrhiza

  • A : scutellum, B : pericarp, C : plumule, D : coleorrhiza


Assertion : Commelina shows cleistogamy.

Reason : This reduces chances of inbreeding.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


What is the characteristic of tapetum

  • It does not store food.

  • It is multi-nucleated.

  • It is multi-layered structure.

  • It nourishes the megaspore



Cotton fibres mainly contains

  • cellulose

  • glycogen

  • protein

  • lipid



The cotton fibres represent epidermal prolongations of seed coat cells. A raw cotton fibre, on average, gives the following values on analysis:

Cellulose, 94%, Protein - 1.3%, Pectic substances - 0.9%, Ash- 1.2%, Wax - 0.6%, Sugars -0.3% and traces of pigments and mineral matter.