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 stigmaof another flower of the same plant is called

(1) xenogamy

(2) geitonogamy

(3) karyogamy

(4) autogamy

Wind pollinated flowers are

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

(1) Megaspore mother cell and antipodal cells

(2) Egg cell and antipodal cells

(3) Nucellus and antipodal cells

(4) Egg nucleus and secondary nucleus

Endosperm is consumed by developing embryo in the seed of

(1) coconut

(2) castor

(3) pea

(4) maize

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

1. It helps in the entry of pollen tube into a synergid

2. It prevents entry of more than one pollen tube into the embryo sac

3. It brings about opening of the pollen tube

4. It guides pollen tube from a synergid to egg

Which one of the following is resistant to enzyme action?

(1) Cork

(2) Wood fibre

(3) Pollen exine

(4) Leaf cuticle

Male gametes in angiosperms are formed by the division of:

(1) microspore

(2) generative cell

(3) vegetative cell

(4) microspore mother cell

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

(1) Microspore mother cell

(2) Male gemete

(3) Egg

(4) Pollen grain

What would be the number of chromosomes in the cells of the aleurone layer in a plant species with 8 chromosomes in it synergids ?

(1) 16

(2) 24

(3) 32

(4) 8