Fill the blanks
(i) The megasproe mother cell undergoes ______and forms a linear tetrad of megaspores
(ii) ___________embryo sac is most common in angiospermic plants
(iii) Mature female gametophyte in angiosperms is ___________celled and ____________nucleated
(iv) ____________are the vegettive cells of the embryo sac
(v) Filiform apparatus is present in ______________of embryo sac

Explanation

### Step-by-Step Solution:

1. **First Blank**: The megaspore mother cell undergoes **meiosis** and forms a linear tetrad of megaspores.
- **Explanation**: The megaspore mother cell (MMC) is diploid and undergoes meiosis, resulting in four haploid megaspores arranged in a linear tetrad.

2. **Second Blank**: **Monosporic** embryo sac is most common in angiospermic plants.
- **Explanation**: The monosporic type of embryo sac is the most prevalent in angiosperms, where out of four megaspores formed, three degenerate and only one survives to form the embryo sac.

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