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Question
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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Solution
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.
RELATED QUESTIONS
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.
A capsicum flower has 240 ovules in its ovary. But, it produces a fruit with only 180 viable seeds.
Give an example of an angiosperm seed that has a perisperm. Name the part the perisperm develops from.
Define Racemose inflorescence
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’.
Explain the different types of endosperms in angiosperms.
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.
The flower is a highly modified and condensed reproductive shoot specially meant for ______
In angiosperms, the site of sexual reproduction is ______.
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 ______.
What is the main function of the corolla?
