The table given below provides a list of female gametophyte features and plant genera Female Gametophyte Plant Genera (i) Monosporic, 8 nucleate A Allium (ii) Monosporic, 4 nucleate B Oenothera (iii) Bisporic, 8 nucleate C Peperomia (iv) Tetrasporic, 16 nucleate D Polygonum Which one of the following options correctly matches the plant genera to female game-tophyte features?
Female Gametophyte Matching
The question asks us to correctly match the features of the female gametophyte development with the corresponding plant genera. Different plants show different patterns in how the female gametophyte (embryo sac) develops from the megaspore mother cell.
Understanding Female Gametophyte Development Types
Female gametophyte development is classified based on the number of megaspores participating in the embryo sac formation and the subsequent nuclear divisions.
- Monosporic Development: Only one megaspore out of the four resulting from meiosis develops into the embryo sac. This is the most common type. Further classification depends on the number of nuclear divisions that occur in the functional megaspore and the resulting number of nuclei.
- Monosporic, 8 nucleate: The functional megaspore undergoes three mitotic divisions, resulting in 8 nuclei. Example: Polygonum type.
- Monosporic, 4 nucleate: The functional megaspore undergoes two mitotic divisions, resulting in 4 nuclei. Example: Oenothera type.
- Bisporic Development: Two megaspore nuclei participate in the development of the embryo sac. This happens when the wall formation after the first meiotic division is absent, resulting in a 2-nucleate structure which then undergoes meiosis II. Example: Allium type (often 8 nucleate).
- Tetrasporic Development: All four megaspore nuclei participate in the development of the embryo sac. This happens when cell wall formation is absent after both meiotic divisions, resulting in a 4-nucleate coenomegaspore. Example: Peperomia type (can be 8 or 16 nucleate).
Matching Features to Genera
Based on common examples of these development types in plant biology:
- (i) Monosporic, 8 nucleate development is characteristic of Polygonum (Type D).
- (ii) Monosporic, 4 nucleate development is characteristic of Oenothera (Type B).
- (iii) Bisporic, 8 nucleate development is characteristic of Allium (Type A).
- (iv) Tetrasporic, 16 nucleate development is characteristic of Peperomia (Type C).
Correct Matching Summary
The correct pairings are:
| Female Gametophyte Features | Plant Genera | Matching |
|---|---|---|
| (i) Monosporic, 8 nucleate | Polygonum (D) | i - D |
| (ii) Monosporic, 4 nucleate | Oenothera (B) | ii - B |
| (iii) Bisporic, 8 nucleate | Allium (A) | iii - A |
| (iv) Tetrasporic, 16 nucleate | Peperomia (C) | iv - C |
The correct combination is i - D; ii - B; iii - A; iv - C.
Important Questions from Diversity of Life Forms
The following table shows common millets (Column X) and their scientific names (Column Y):
Column X
Column Y
A.
Ragi (Finger millet)
i.
Eleusine coracana
B.
Jowar (Great millet)
ii.
Paspalum scrobiculatum
C.
Kodo millet
iii.
Pennisetum typhoides/ glaucum
D.
Bajra (Pearl millet)
iv.
Sorghum bicolor
Which one of the following options represents the correct match between Column X and Column Y?
Which one of the following fossils is no longer considered to be a true vascular plant based on the structure of the secondary thickening of the conducting elements?
Select the correct former name for The International Code of Nomenclature (ICN) which was changed as part of the Melbourne code.
Based on the reported estimates of biodiversity in India, select the correct option that represents the decreasing order of total number of species reported in these taxa.
Select the rare or endangered species which also have exceptionally low genetic variability, as documented by multi-locus molecular methods.
