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प्रश्न
Name the parts of an angiosperm flower in which development of male and female gametophyte take place.
उत्तर
Angiosperm plants are flowering plants. The flower is a modified shoot whose function is reproduction. The flower has the following four whorls –
- Calyx - It is formed from sepals.
- Corolla - It is formed from petals.
- Androecium - It is formed from stamens. It is called the male reproductive cycle of the flower.
- Gynoecium - It is formed from carpels. It is called the female reproductive cycle of the flower.
Pollen grains are produced from pollen mother cells in the anther of stamen by meiotic division. Pollen grains are called male gametophyte.
The carpel has three parts – ovary, style and stigma. The ovule is formed in the ovary. The female gametophyte or embryo sac develops from the haploid megaspore by meiotic division from the megaspore mother cell of the nucellus of the ovule.
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संबंधित प्रश्न
In a flowering plant a microspore mother cell produces four male gametophytes while a megapore mother cell forms only one female gametophyte. Explain
Read the statement and answer the questions that follow.
A flower of brinjal has 520 ovules in its ovary. However, it produces a fruit with only 480 viable seeds.
(a) What could have prevented the rest of the 40 ovules from maturing into viable seeds? Explain giving a reason.
(b) Describe the development of a dicot embryo in a viable seed.
(c) Why certain angiospermic seed albuminous while others are exalbuminous? Explain.
Give an example of an angiosperm seed that has a perisperm. Name the part the perisperm develops from.
Name a plant which flowers every twelve years.
Name the terminal stage of ageing in the life cycle of plants
Explain the events upto double fertilisation after the pollen tube enters one of the synergids in an ovule of an angiosperm.
Sketch and label ‘structure of a pea flower’.
Science of cultivation, breeding, marketing and arrangement of flowers is called ______.
Fragrant flowers with well developed nectaries are an adaptation for ______.
The flower is the site of ______.
In a fertilized ovule, n, 2n, and 3n conditions occur respectively in ______
Verticillaster inflorescence is a characteristic feature of ______.
Place the following groups of plants in order, beginning with those that first appeared on the earth and progressing toward those that appeared most recently in time.
What is the similarity between gymnosperms and angiosperms?
Which of the following statement is incorrect?
The flower is a highly modified and condensed reproductive shoot specially meant for ______
In angiosperms, the site of sexual reproduction is ______.
