the embryo-sac. In angiosperms, it is the central portion of the ovule in which
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the embryo-sac. In angiosperms, it is the central portion of the ovule in which the embryo sac develops. Questions 1-5. Compare the life cycles of these two Divisions of seed plants: A) Magnoliophyta (flowering plants) B) Coniferophyta (pine, fir) 1 . Gametophyte forms egg in an archegonium. A) A,B B) A only C) B T-54 2. Gametophyte plant is haploid. ME! A) A,B B) A only C) B 3. Heterosporous (microspores/ megaspores) A) A,B B) A only C) B 4. Forms fruit from ovary A) A,B B) A only ??? 5. Male gametophyte is the pollen grain A) A,B B) A only ?) ? Indicate the correct generation to which it refers. Choose the correct answer from the following list: 6-11. Read the statements concerning the life cycles of the seed and non seed plants. Diplo A) sporophyte generation Haplad B) gametophyte generation 6. Leaves of pine belong to the 7. Archegonia in pine ovule belong to the 8. Coleus pollen belongs to the 9. Ovary located in angiosperm life cycle. 10. Any microspore mother cell. 11. Any spore or mega/microsporeExplanation / Answer
1. Gametophyte forms egg in an archegonium in B only.
Archegonium is the term used to describe the ovule in the lower plants like bryophytes, pteridophytes and in gymnosperms (conifers only, in Cycad it is called ovule).
2. Gametophyte plant is haploid in both A and B.
Female Gametophyte in Magnoliophyta and Conifers represented by Embryosac and is haploid. Male gametophyte is represented by Pollen grain in both the group of plants and is haploid.
3. Heterosporous is found in both A and B.
Both flowering plants and Conifers produced two kind of spores. Megaspore and microspore. In flowering plants, megaspore produced inside ovule called megasporangium. In conifers megaspore produced inside the female cone.
Microspore in flowering plants produced inside microspore him (anther), and in conifers it is produced within male cone.
4. A only forms fruit from ovary. Fruit is not produced in conifers, in this group of plants ovule is naked a Nd do not surrounded by fleshy parts as in flowering plants. So gymnosperms are called as naked seeded plants.
5. Male gametophyte is the pollen grain in both A and B.
Pollen grain represent the male gametophyte stage in both group of plants. Pollen grain carries male gametes for fertilization.
6. Leaves of pine belongs to sporophytic generation.
Leaf is produced on sporophytic generation of the plant which is diploid in nature.
7. Archegonia in the pine belongs to the gametophyte generation.
Archegonia is the female reproductive structure and is haploid in nature it belongs to the gametophyte stage.
8. Coleus pollen belongs to the gametophyte stage
Pollen grain represent the male gametophyte in both flowering and Conifers. It belongs to the gametophyte stage because it is haploid in nature.
9. Ovary located in angiosperms life cycle is diploid in nature and is represents the sporophytic generation. Inside the ovary is ovule that contains the embryosac that represents the gametophyte generation.
10. Any microspore mother cell is diploid in nature so it represent sporophytic generation. After meiosis it produces microspore or pollen grain that represents the gametophyte generation.
11. Any microspore or megaspore represents the gametophytic generation because they are haploid in nature.
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