In the lab we saw several plants which produce a thallus. What is a thallus?

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BlackTom AI · Accepted Answer

The question asks: In the lab we saw several plants which produce a thallus. What is a thallus?
Option A: The male reproductive structures of plants. This is incorrect because a thallus is not a reproductive organ; it refers to the main body tissue or plant body, not specifically male structures like anthers or strobili.
Option B: Specialised roots used in vegetative development by some plants. This is wrong since thallus is not a root or root-like structure; many primitive plants lack true roots altogether and have a simple body called a thallus.
Option C: A seed leaf of angiosperms. This is incorrect because a seed leaf (cotyledon) is part of a seed in flowering plants, which is unrelated to the thallus concept used for bryophytes and some algae.
Option D: The spore capsule of mosses. This is not right because the spore capsule (seta and capsule) is a reproductive structure, whereas a thallus describes the plant body morphology, not the reproductive capsule.
Option E: A flat leaf-like structure produced by liverworts and other primitive plants. This is correct because thallus refers to the dorsiventrally flattened, leaf-like body commonly seen in liverworts and similar primitive flora, representing the main photosynthetic tissue rather than a defined stem or root system.
In summary, the term thallus describes a flattened, undifferentiated plant body typical of liverworts and other primitive plants, which aligns with option E. The other options misidentify a thallus as a reproductive organ, root structure, seed leaf, or spore capsule, which are distinct plant features not denoted by the term thallus.

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In the lab we saw several plants which produce a thallus. What is a thallus?

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