10 Questions
What is the function of the filament in a stamen?
It supports the anther
How many thecae are present in the anther of a typical stamen?
4
What is the term used to describe the formation of microspores from a pollen mother cell?
Microsporogenesis
Which of the following structures represents the male gametophyte in a flowering plant?
Pollen grain
What are the two cells present in a mature pollen grain?
Vegetative cell and generative cell
Explain the structure of a stamen in a flower and its components.
A stamen consists of a filament, which is a slender stalk, and an anther, which is a bilobed structure with two thecae per lobe.
Describe the process of microsporogenesis and its significance in sexual reproduction of plants.
Microsporogenesis is the formation of microspores through meiosis from a pollen mother cell. It is significant as microspores develop into pollen grains, representing male gametophytes.
What is the role of the pollen sacs in the anther of a stamen?
The pollen sacs in the anther are where microsporangia develop, ultimately giving rise to pollen grains.
Differentiate between the generative cell and the vegetative cell in a mature pollen grain.
The generative cell in a pollen grain is responsible for forming sperm cells, while the vegetative cell supports and nourishes the generative cell.
Explain the significance of the androecium and gynoecium in the sexual reproduction of flowering plants.
The androecium contains the male reproductive structures, while the gynoecium contains the female reproductive structures, facilitating pollination and fertilization in plants.
Study Notes
Male Reproductive Structures
- A stamen consists of two parts: a filament (slender and long stalk) and an anther (bilobed structure)
- Each lobe of the anther has two thecae, making it dithecous
- The anther is a tetragonal structure with microsporangia at the edge, two per lobe
- Microsporangia develop into pollen sacs later on
Pollen Grain Formation
- Microsporogenesis is the formation of microspores through meiosis from a pollen mother cell
- Pollen grains represent the male gametophytes
- Mature pollen grains consist of two cells: vegetative cells and generative cells
Learn about the pre-fertilisation structures and events in sexual reproduction of plants. This quiz covers topics such as male and female reproductive structures in flowers, development of stamen, microsporangium, and pollen grain.
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