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Question
The fruit of ..... plant are dispersed by grazing animals such as goats and cows.
The fruit of ..... plant are dispersed by grazing animals such as goats and cows.
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Solution
The correct option is B Xanthium
Xanthium has hairy and seeds with hooks that get easily stuck in the fur and hide of animals and get dispersed far off places. They also get dispersed by wind. When climatic conditions are favourable, they burst open by the explosive mechanism and are transported far off places and germinate into new plants. So, fruits of Xanthium are dispersed by animals such as goats and cows because, they have hooks so, when animals are feeding on their leaves, these seeds gets attached to animals.
Sunflower seeds disperse through the actions of people and animals as well as wind and water. When the plants themselves carry out the dispersal, the process is called as dehiscence. In dehiscence or dispersion by explosion, a seed-containing structure such as a pod, bursts shooting the seeds into the air. These seeds land up at a distance depending upon the weight of the seed and the force with which they are thrown. Some of the plants that disperse their seeds in this manner include plants of the pea, mustard and balsam family. Mammal-dispersed fruits tend to be larger, aromatic, not colorful (most non-primate mammals have poor color vision) and usually have larger seeds than bird fruits. The animal often transports the fruits a short distance (compared to the flying distances of many birds) to a safer place before eating the pulp and dropping at least some of the seeds. The seeds of coyote gourds (Cucurbita spp.) may be dispersed in this manner.
Therefore, the correct answer is option B.
Xanthium has hairy and seeds with hooks that get easily stuck in the fur and hide of animals and get dispersed far off places. They also get dispersed by wind. When climatic conditions are favourable, they burst open by the explosive mechanism and are transported far off places and germinate into new plants. So, fruits of Xanthium are dispersed by animals such as goats and cows because, they have hooks so, when animals are feeding on their leaves, these seeds gets attached to animals.
Sunflower seeds disperse through the actions of people and animals as well as wind and water. When the plants themselves carry out the dispersal, the process is called as dehiscence. In dehiscence or dispersion by explosion, a seed-containing structure such as a pod, bursts shooting the seeds into the air. These seeds land up at a distance depending upon the weight of the seed and the force with which they are thrown. Some of the plants that disperse their seeds in this manner include plants of the pea, mustard and balsam family. Mammal-dispersed fruits tend to be larger, aromatic, not colorful (most non-primate mammals have poor color vision) and usually have larger seeds than bird fruits. The animal often transports the fruits a short distance (compared to the flying distances of many birds) to a safer place before eating the pulp and dropping at least some of the seeds. The seeds of coyote gourds (Cucurbita spp.) may be dispersed in this manner.
Therefore, the correct answer is option B.
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