Plant Kingdom Amphibians Explained
The term amphibians of the plant kingdom refers to a group of plants that require water for their reproductive cycle, yet live on land. This dual requirement mirrors the life cycle of true amphibians.
Why Bryophytes?
- Bryophytes, which include mosses, liverworts, and hornworts, are known as the amphibians of the plant kingdom.
- They exhibit dependence on water, particularly for sexual reproduction. The male gametes (sperm) need a film of water to travel to reach the female gametes (eggs).
- While they possess simple stems, leaves, and root-like structures, they lack true vascular tissues (xylem and phloem) found in more advanced plants, limiting their size and habitat to moist environments.
Comparison with Other Options
- Pteridophytes (like ferns) also require water for reproduction but possess vascular tissues, making them more adapted to land than bryophytes.
- Gymnosperms (like conifers) have seeds and are well-adapted to drier conditions, not relying on external water for fertilization.
- Thallophytes is a broader, less formal group including algae and fungi, many of which are primarily aquatic.
Therefore, Bryophytes best fit the description due to their specific need for water for fertilization combined with a predominantly terrestrial, yet water-dependent, lifestyle.
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Important Questions from Botany
One advantage of sexual reproduction over asexual reproduction is that it helps species to survive over long evolutionary time. This is because sexual reproduction produces :
During a laboratory experiment, a student immerses epidermal leaf peel in a hypertonic solution. After some time, the student examined the cells under a microscope and observed that:
The breakdown of glucose in cytoplasm results in the formation of
After fertilization, the fruit and the seed are produced by
- Which one of the following groups is called 'amphibians of plant kingdom'?
