Figure 31.1 below depicts the outline of a large fairy ring that has appeared overnight in an open meadow, as viewed from above. The fairy ring represents the furthest advance of this mycelium through the soil. Locations A-D are all 0.5 meters below the soil surface. Responses may be used once, more than once, or not at all.

-Orchid seeds are tiny, with virtually no endosperm and with miniscule cotyledons. If such seeds are deposited in a dark, moist environment then which of these represents the most likely means by which fungi might assist in seed germination, given what the seeds lack?

Question

Figure 31.1 below depicts the outline of a large fairy ring that has appeared overnight in an open meadow, as viewed from above. The fairy ring represents the furthest advance of this mycelium through the soil. Locations A-D are all 0.5 meters below the soil surface. Responses may be used once, more than once, or not at all.

-Orchid seeds are tiny, with virtually no endosperm and with miniscule cotyledons. If such seeds are deposited in a dark, moist environment then which of these represents the most likely means by which fungi might assist in seed germination, given what the seeds lack?

Quizplus · Accepted Answer

Since orchid seeds have virtually no endosperm and tiny cotyledons, fungi can assist in seed germination by providing the embryos with some of the organic nutrients they have absorbed. This will enable the orchid plants to acquire the necessary nutrients and energy for growth and development. Option A is incorrect as chloroplasts are not necessary for seed germination. Option B is incorrect as water and minerals are basic requirements for seed germination and cannot be considered as fungi-specific mechanisms. Option D is incorrect as seed coat strength is not relevant to seed germination.

Figure 311 Below Depicts the Outline of a Large Fairy Ring