CBSE
Multiple Choice QuestionsDouble fertilization means
fusion of nucleus of male gamete with the egg nucleus
fusion of two polar nuclei
fusion of sperm nucleus with secondary nucleus
fusion of one sperm nucleus with nucleus and fusion of other sperm nucleus with secondary nucleus
Among plants "pheromones" are secreted by the cells of the following plants for given function
all plants for growth and development
Yeast for facilitating mating
all fungi for sexual reproduction
Rhizopus for formation of zygospore
For the formation of tetrasporic embryosac, how many megaspore mother cells are required?
1
2
3
4
An orthotropus ovule is one in which micropyle and chalaza are
in straight line of funiculus
parallel of funiculus
at right angles to funiculus
oblique to funiculus
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?
Circinotropous
Anatropous
Amphitropous
Atropous
In a type of apomixis known as adventive embryony, embryos develop directly from the
nucellus or integuments
synergids or antipodals in an embryo sac
accessory embryo sacs in the ovule
zygote
Through which cell of the embryo sac, does the pollen tube enter the embryo sac?
Egg cell
Central cell
Persistant synergid
Degenerated synergid
If the pollen tube enters the ovule through funiculus, the phenomenon is known as
porogamy
chalazogamy
mesogamy
heterogamy
Double fertilisation was discovered by
Nawaschin
Starsburger
Emerson
None of the above
Which of the following is the most resistant material in pollen grain
Sporopollenin
Intine
Exine
Certicle
