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प्रश्न
In a flowering plant a microspore mother cell produces four male gametophytes, while a megaspore mother cell forms only one female gametophyte. Explain.
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उत्तर
Cyanobacteria are free living or symbiotic blue-green algae which are capable of converting atmospheric molecular nitrogen into soluble forms like nitrites or nitrates. They enrich the nitrogen content of the soil, thus, acting as a natural fertilizer. They replenish the soil with the nitrogenous compounds and hence are useful in agriculture.
संबंधित प्रश्न
List the three stages the annuals and biennial angiosperms have to pass through during their life cycle.
Give an example of an angiosperm seed that has a perisperm. Name the part the perisperm develops from.
Give a reason for the Following:
Pollen grains of wind-pollinated flowers are produced in large quantities.
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’.
A typical flower has ______ different kinds of whorl.
Science of cultivation, breeding, marketing and arrangement of flowers is called ______.
Fragrant flowers with well developed nectaries are an adaptation for ______.
Pollen grains are well preserved as fossils because of the presence of ______
Verticillaster inflorescence is a characteristic feature of ______.
Which of the following statement is incorrect?
Match List I with List II:
| List I (Types of Stamens) |
List II (Example) |
||
| A. | Monoadelphous | I. | Citrus |
| B. | Diadelphous | II. | Pea |
| C. | Polyadelphous | III. | Lily |
| D. | Epiphyllous | IV. | China-rose |
Choose the correct answer from the options given below:
Axile placentation is observed in ______.
A flower is biologically defined as a modified and compressed _______.
Which part of the flower is responsible for protecting the inner floral parts during the bud stage?
The male reproductive unit of a flower, the androecium, is made up of individual members called ______.
