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Answer :
Final answer:
If the viscosity of viscum seeds is an adaptation for dispersal, then we could expect the fruit to have features that attract birds for consumption, helping these seeds disperse over a wide area. The seeds adhere to birds' beaks or are excreted in a new location after consumption. This not only disperses the seeds but often results in them landing in favorable and less competitive environments.
Explanation:
If the viscosity of viscum seeds is primarily an adaptation for dispersal rather than an adaptation for infecting host plant tissues, then we can expect some specific features. The viscous, or sticky nature of the seeds will allow them to adhere to the beaks of birds that consume the fruit. This allows the seeds to be transported to a new location when the bird moves, essentially dispersing the seeds over a wider area. Further, it can be expected that the fruit will contain characteristics that make it attractive to birds, such as a vibrant color, appealing scent, or nutritive value, which is common with fruit and seed dispersal in plants.
Once the bird consumes the fruit and excretes the undigested seeds, the seeds can germinate in a new location. This is a form of endozoochory. Notably, this dispersive strategy often results in the seeds finding favorable and less competitive environments in which to grow. This shows the mutualistic relationships that plants and animals can form, where animals are provided a food source and in return, they help in the plant's genetic material dispersal - a win-win situation for both.
The fact that the fruit has a sticky seed also indicates a potential for epizoochory. This refers to the process where the seed or fruit attaches to the external surfaces, such as the fur or feathers of an animal, and is thus dispersed. This adhesion is facilitated by the viscous nature of the seed exterior in genus viscum members.
Learn more about Seed Dispersal here:
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Ans.
Viscum album is a plant species, commonly known as mistletoe. It is a hemi-parasitic plant that grows on other trees.
Birds cause seed dispersal as they pick seeds from parent plant and drop them in other places. Seeds of mistletoe are sticky or viscous due to mucus and they provide nutritious food to the birds.
Hence, it can be concluded that the mistletoe seeds show adaptations primarily for seed dispersion, not for infecting the host plant.
Thus, the correct answer to be filled in the blank is 'is nutritious to the dispersing birds.'
