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प्रश्न
From the statements given below choose the option that are true for a typical female gametophyte of a flowering plant.
- It is 8-nucleate and 7-celled at maturity
- It is free-nuclear during the development
- It is situated inside the integument but outside the nucellus
- It has an egg apparatus situated at the chalazal end
विकल्प
i and ii
ii and iv
i and iv
None of these
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उत्तर
i and ii
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संबंधित प्रश्न
The embryo sac is ______
The method of embryo sac forming from a single megaspore is called ______.
Name the component cells of the ‘egg apparatus’ in an embryo sac.
Draw the diagram of a mature embryo sac and show its 8-nucleate, 7-celled nature. Show the following parts: antipodals, synergids, egg, central cell, polar nuclei.
With a neat, labelled diagram, describe the parts of a mature angiosperm embryo sac. Mention the role of synergids.
Embryo sacs of some apomictic species appear normal but contain diploid cells. Suggest a suitable explanation for the condition.
Explain the monosporic development of the embryo sac in the ovule of an angiosperm.
Draw a diagram of the mature embryo sac of an angiospermic ovule and label any four parts in it.
During the development of the female gametophyte, the functional megaspore undergoes mitotic divisions without immediate cell wall formation. What are these divisions called?
Following the 2-nucleate stage, both nuclei divide simultaneously during the second mitotic division. What is the resulting stage called, and how many nuclei are at each pole?
Which cells or cell group at the micropylar end of the mature embryo sac constitute the egg apparatus?
How many nuclei contribute to the formation of the endosperm, and what is the resulting ploidy level of the endosperm?
The mature embryo sac is described as monosporic and of the Polygonum type. What does the term monosporic indicate about the origin of the embryo sac?
Based on the cell distribution table, which cell or group of cells contributes a haploid gamete nucleus during double fertilization?
What is the total number of haploid nuclei present in the 8-nucleate stage of the developing female gametophyte before cell walls are formed?
During the development of the embryo sac, which stage immediately precedes the formation of the polar nuclei by migration?
In the mature embryo sac, which structure contains the filiform apparatus that aids in guiding the pollen tube?
