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प्रश्न
Protonema is ______.
विकल्प
Haploid and is found in mosses
Diploid and is found in liverworts
Diploid and is found in pteridophytes
Haploid and is found in pteridophytes
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उत्तर
Protonema is haploid and is found in mosses.
Explanation:
The predominant stage of the life cycle of a moss is the gametophyte which consists of two stages. The first stage is the protonema stage (juvenile stage) and the second stage is the leafy stage. Moss protonema resembles to multicellular green algae in structure. Moss plant develops from protonema.
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संबंधित प्रश्न
Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.
Mention the ploidy of the following:
Zygote of a fern
Explain briefly the following term with a suitable example:
Archegonium
Explain briefly the following term with a suitable example:
Diplontic
Which is NOT a character of bryophytes?
Bryophytes that prevent soil erosion by forming dense mats on the soil are ______.
The plant body in higher plants is well differentiated and well developed. Roots are the organs used for the purpose of absorption. What is the equivalent of roots in the less developed lower plants?
Draw labelled diagrams of
- Female and male thallus of a liverwort.
- Gametophyte and sporophyte of Funaria.
- Alternation of generation in Angiosperm.
The correct sequence of events in the life cycle of bryophytes is:
- Fusion of antherozoid with egg.
- Attachment of gametophyte to substratum.
- Reduction division to produce haploid spores.
- Formation of sporophyte.
- Release of antherozoids into water.
Choose the correct answer from the option given below:
Match List - I with List - II.
| List - I | List - II |
| A. Chlorophyll a | I. Yellow-green |
| B. Chlorophyll b | II. Yellow |
| C. Xanthophylls | III. Blue-green |
| D. Carotenoids | IV. Yellow to Yellow-orange |
Choose the option with all correct matches.
Match List - I with List - II.
| List - I | List - II |
| A. Pteridophyte | I. Salvia |
| B. Bryophyte | II. Ginkgo |
| C. Angiosperm | III. Polytrichum |
| D. Gymnosperm | IV. Salvinia |
Choose the option with all correct matches.
In bryophytes, the gemmae help in which one of the following?
Identify the pair of heterosporous pteridophytes among the following:
Assertion A: The first stage of gametophyte in the life cycle of moss is protonema stage.
Reason R: Protonema develops directly from spores produced in capsule.
In the light of the above statements, choose the most appropriate answer from the options given below:
