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121.

How many haploid nuclei are present in a mature pollen grain

  • One

  • Two

  • Three

  • Four


B.

Two

Mature pollen grain carries two haploid nuclei which moves into the cytoplasm of the synergid.

One of the male gametes moves towards the egg cell and fuses with its nucleus thus completing the syngamy. This results in the formation of a diploid cell, the zygote. The other male gamete moves towards the two polar nuclei located in the central cell and fuses with them to produce a triploid primary endosperm nucleus (PEN)


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122.

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

  • enzymes

  • high temperature

  • strong acids

  • cannot be degraded


123.

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

  • 30

  • 10

  • 60

  • 90


124.

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


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125.

Plants with inferior ovary usually bear

  • pseudocarps

  • berries

  • aggregate fruits

  • seedless fruits


126.

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


127.

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


128.

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


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129.

What is the characteristic of tapetum

  • It does not store food.

  • It is multi-nucleated.

  • It is multi-layered structure.

  • It nourishes the megaspore


130.

Cotton fibres mainly contains

  • cellulose

  • glycogen

  • protein

  • lipid


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