Assertion Reason Test: Sexual Reproduction In Flowering Plants - NEET MCQ

A: Restitutional nucleus can be observed in endothecium cells.

R: Endothecium cells are usually triploid.

A: Chalazal vacuole is present in the help cell of embryo sac.

R: Polarity of synergid cytoplasm is opposite to egg cell.

A: Formation of mature male gametophyte requires one meiotic and one mitotic division in 60% of the angiosperms.

R: Pollination occurs in three celled conditions in the majority of angiosperms.

A: Filiform apparatus guides the pollen tube into the synergids.

R: It is a special cellular thickening at the micropylar tip to secrete chemotropic stimulus.

A: Geitonogamy helps in maintaining homozygosity and superiority of the race indefinitely.

R: It is functionally, ecologically and genetically cross-pollination.

A: Initial growth of pollen tube occurs on the expenditure of food present in the stigma and style.

R: Pollen tube travels intracellularly and chemotactically.

A: Eight cells of octant stage in dicot embryogeny are made by 2 vertical and one transverse division in an embryonal cell.

R: These cells are arranged in epibasal and hypobasal tier.

A: Triple fusion is associated with sexual reproduction in all spermatophytes.

R: It is required to form a definitive nucleus as nutritive tissue.

A: Anatropous ovule is resupinate ovule.

R: The body of ovule is completely bent with hilum close to a micropylar end.

A: More than one pollen tubes can enter an embryo sac.

R: Double fertilization can occur by the contribution of gametes from different pollens.

A: Hybrid seeds have to be produced every year because seeds collected from hybrid plants cannot maintain hybrid characters if sown subsequently.

R: Hybrid seeds show segregation of traits.

A: Growth of male gametophyte is completed over the female reproductive organ.

R: 2-celled stage of partial male gametophyte is developed in-situ.

A: Certain proteins of pollen origin identifies the compatible stigma.

R: Compatibility proteins are found located in ektexine.

A: Tetraploid gametophyte can be produced from tetraploid sporophyte by the means of apogamy.

R: Apogamy involves fertilisation, not meiosis.

A: Continued self-pollination checks inbreeding depression.

R: Pollen release and stigma receptivity are synchronised.

A: Complete radicle is not produced by hypo-basal tier of octant embryo during Cruciferad development.

R: Hypophysis cell of suspensor contributes to the tip of radicle in this type of development.

A: Apomictic embryo is an asexual mode of reproduction.

R: It prevents the segregation of traits.