Offsets are produced by
Meiotic divisions
Mitotic divisions
Parthenogenesis
Parthenocarpy
B.
Mitotic divisions
Offset is a vegetative part of a plant, formed by mitosis.
– Meiotic divisions do not occur in somatic cells.
– Parthenogenesis is the formation of an embryo from ovum or egg without fertilisation.
– Parthenocarpy is the fruit formed without fertilisation, (generally seedless).
With respect to angiosperms, identify the incorrect pair from the following
antipodal - 2n
Vegetative all of male gametophyte - n
Primary endosperm nucleus-3n
Cell of nucellus of ovule -2n
Which one of the following statements is correct?
Hard outer of pollen is called intine
Sporogenous tissue is haploid
ENdothelium produces the microspores
Tapetum nourishes the developing pollen
Which of the following has proved helpful in preserving pollen as fossils?
Pollenkitt
Cellulosic intine
Sporopollenin
Oil content
When pollen tube enters through micropyle, the process is called
Porogamy
Chalazogamy
Mesogarny
Apogamy
Which of the following floral parts forms pericarp after fertilization?
Nucellus
Outer integument
Ovary wall
Inner integument
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
–120°C
–80°C
–160°C
–196°C
