Multiple Choice QuestionsWhat does the filiform apparatus do at the entrance into ovule?
It helps in the entry of pollen tube into a synergid
It prevents entry of more than one pollen tube into the embryo sac
It brings about opening of the pollen tube
It brings about opening of the pollen tube
Importance of day length in flowering of plants was first shown in
Lemna
tobacco
Cotton
Cotton
Male gametes in angiosperms are formed by the division of
microspore
generative cell
vegetative cell
vegetative cell
Which one of the following is surrounded by a callose wall?
Microspore mother cell
Male gamete
Egg
Egg
Parthenocarpic tomato fruits can be produced by
Removing androecium of flowers before pollen grains are released
Treating the plants with low concentrations of gibberellic acid and auxins
Raising the plants from vernalized seeds
Raising the plants from vernalized seeds
Long filamentous threads protruding at the end of a young cob of maize are
anthers
styles
ovaries
ovaries
Conifers differ from grasses in the
production of seeds from ovules
lack of xylem tracheids
absence of pollen tube
absence of pollen tube
The arrangement of the nuclei in a normal embryo sac in the dicot plants is
2+4+2
3+2+3
2+3+3
2+3+3
An enzyme that can stimulate germination of barley seeds is
α-amylase
lipase
protease
protease
In a cereal grain the single cotyledon of embryo is represented by
coleorhiza
scutellum
prophyll
prophyll
