Sexual Reproduction in Flowering Plants

Nucellar polyembryony is reported in species of

1. Citrus
2. Gossypium
3. Triticum
4. Brassica.

Which one of the following pollinations is autogamous?

1. Geitonogamy
2. Xenogamy
3. Chasmogamy
4. Cleistogamy

Wind pollination is common in

1. legumes
2. lilies
3. grasses
4. orchids.

What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?

1. 42
2. 63
3. 84
4. 21

Apomictic embryos in Citrus arise from

1. synergids
2. maternal sporophytic tissue in ovule
3. antipodal cells
4. diploid egg

Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called

1. xenogamy
2. geitonogamy
3. karyogamy
4. autogamy

Wind pollinated flowers are

1. small, brightly coloured, producing large number of pollen grains
2. small, producing large number of dry pollen grains
3. large producing abundant nectar and pollen
4. small, producing nectar and dry pollen

Which one of the following pairs of plant structures has haploid number of chromosomes?

1. Nucellus and antipodal cells
2. Egg nucleus and secondary nucleus
3. Megaspore mother cell and antipodal cells
4. Egg cell and antipodal cells

What does the filiform apparatus do at the entrance into ovule?

1. It brings about opening of the pollen tube.
2. It guides pollen tube from a synergid to egg.
3. It helps in the entry of pollen tube into a synergid.
4. It prevents entry of more than one pollen tube into the embryo sac.

Unisexuality of flowers prevents

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

Which one of the following is resistant to enzyme action?

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

Male gametes in angiosperms are formed by the division of

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

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

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

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

1. hairs
2. anthers
3. styles
4. ovaries

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

1. coleoptile
2. coleorhiza
3. scutellum
4. prophyll.

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

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.

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

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

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

An ovule which becomes curved so that the nucellus and embryo sac lie at right angles to the funicle is

1. hemitropous
2. campylotropous
3. anatropous
4. orthotropous.

Anthesis is a phenomenon which refers to

1. reception of pollen by stigma
2. formation of pollen
3. development of anther
4. opening of flower bud.

In a flowering plant, archesporium gives rise to

1. only the wall of the sporangium
2. both wall and the sporogenous cells
3. wall and the tapetum
4. only tapetum and sporogenous cells.

In angiosperms pollen tubes liberate their male gametes into the

1. central cell
2. antipodal cells
3. egg cell
4. synergids

In angiosperms all the four microspores of tetrad are covered by a layer which is formed by

1. pectocellulose
2. callose
3. cellulose
4. sporopollenin

What is the direction of micropyle in anatropous ovule?

1. Upwards
2. Downward
3. Right
4. Left

Adventive embryony in Citrus is due to

1. nucellus
2. integuments
3. zygotic embryo
4. fertilized egg.

In grasses what happens in microspore mother cell for the formation of mature pollen grains?

1. One meiotic and two mitotic divisions
2. One meiotic and one mitotic divisions
3. One meiotic division
4. One mitotic division

Anemophily type of pollination is found in

1. Salvia
2. bottle brush
3. Vallisneria
4. coconut.

Hair found in the inflorescence of Zea mays are the modification of

1. style
2. stigma
3. spathe
4. filaments.