An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is
cuticle
sporopollenin
lignin
lignin
B.
sporopollenin
Sporopollenin is a fatty substance present in the exine of pollen grains. It is resistant to microbial and chemical decomposition and can withstand the extreme environmental conditions. Due to presence of sporopollenin, pollen grains are well preserved during fossilization.
Geitonogamy involves
Fertilisation of a flower by the pollen from another flower of the same plant
Fertilisation of a flower by the pollen from the same flower
Fertilisation of a flower by the pollen from a flower of another plant in the same population
Fertilisation of a flower by the pollen from a flower of another plant in the same population
Assisted reproductive technology, IVF involves transfer of
ovum into the Fallopian tube
zygote into the Fallopian tube
zygote into the uterus
zygote into the uterus
Pollen tablets are available in the market for
In vitro fertilisation
breeding programmes
supplementing food
supplementing food
Function of filiform apparatus is to
recognise the suitable pollen at the stigma
stimulate the division of generative cell
produce nectar
produce nectar
Male gametophyte in angiosperms produces
Two sperms and a vegetative cell
Single sperm and a vegetative cell
Single sperm and a two vegetative cells
Single sperm and a two vegetative cells
Even in absence of pollinating agents seed-setting is assured in
Commellina
Zostera
Salvia
Salvia
