Pre Fertilisation: Structure and Events
Pre Fertilisation: Structure and Events: Overview
This topic describes the structure and events that occur in the pre-fertilisation stage. It explains microsporogenesis and megasporogenesis in detail. Then, it describes pollination, its types and agents. It also provides brief account of artificial hybridisation.
Important Questions on Pre Fertilisation: Structure and Events
If the pollen tube enters from the integuments of the ovule, the phenomenon called chalazogamy.
Define mesogamy.
Identify the type of entry of the pollen tube into the ovule.
Define the following:
PAR
If the pollen tube enters from the micropyle of the ovule, the phenomenon called chalazogamy.
Chalazogamy occurs in
Define chalazogamy.
Identify the type of entry of the pollen tube into the ovule.
Label the different parts of the pollen sac in the given image and write the function of the epidermis.
Which of the following layers of a pollen sac are protective?
The epidermis in the pollen sacs is multilayered.
Describe a microsporangium and enlist its wall layers.
Which of the following plants exhibit chalazogamy?
The middle layer of microsporangial wall is known as nourishing layer.
Explain the structure and function of the microsporangium wall.
Which layer of the microsporangium wall is ephemeral?
Name the layer which supplies nourishment to the developing pollen grains.
Porogamy refers to the entry of the pollen tube in embryo sac through:
Which of the following wall layer of anther shows fibrous thickenings of cellulose?
