If a plot of yam becomes heavily infested with weeds. What is one effect that is likely to have on the production of yam?
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Answer:
Part (b) stated that the plot of yam became heavily infested with weeds. Candidates were required to state one effect that situation was likely to have on the production of yam. This was fairly well done with the common responses being lack of/ competition for nutrients, reduction in quality and quantity of tubers.
Explanation:
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Answer:
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Yams
ContentContent
1. Description
2. Uses
3. Propagation
4. References
Diseases
- Fungal
- Viral
Pests
- Nematodes
- Insects
See questions about Yams
Description
Yam is the name given to several plant species in the genus Dioscorea including Dioscorea alata (white yam), Dioscorea bulbifera (potato yam), Dioscorea cayenensis (yellow yam), Dioscorea esculenta (Asiatic yam) and Dioscorea batatas (Chinese yam) that are grown for their edible tubers. These species are not to be confused with the sweet potato, Ipomoea batatas, which is often referred to as a yam in the US. Yam plants are herbaceous annual or perennials with climbing or trailing vines. The vines can be smooth or prickly, reaching 10 m (32.8 ft) or more in length depending on the variety. The leaves of the plant are simple and usually oval to heart-shaped with petioles which are the same length, or slightly longer, than the leaf blade itself. Some varieties possess spikes at the bases of the leaves. The plant can produce one singular tuber or several tubers which extend from stolons from a central corm (up to 20) depending on the species. The tubers can be cylindrical, curved or lobed, with brown, grey, black or pink skin and white, orange or purplish flesh. Most yams are annual plants, harvested after one season, but some are perennial with tubers increasing in size each year with the vines dying back at the end of the growing season and regrowing on the return of favorable conditions. The origin of yams is uncertain and genetic information suggests that there may be more than one point of origin.
Explanation:
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Yams
ContentContent
1. Description
2. Uses
3. Propagation
4. References
Diseases
- Fungal
- Viral
Pests
- Nematodes
- Insects
See questions about Yams
Description
Yam is the name given to several plant species in the genus Dioscorea including Dioscorea alata (white yam), Dioscorea bulbifera (potato yam), Dioscorea cayenensis (yellow yam), Dioscorea esculenta (Asiatic yam) and Dioscorea batatas (Chinese yam) that are grown for their edible tubers. These species are not to be confused with the sweet potato, Ipomoea batatas, which is often referred to as a yam in the US. Yam plants are herbaceous annual or perennials with climbing or trailing vines. The vines can be smooth or prickly, reaching 10 m (32.8 ft) or more in length depending on the variety. The leaves of the plant are simple and usually oval to heart-shaped with petioles which are the same length, or slightly longer, than the leaf blade itself. Some varieties possess spikes at the bases of the leaves. The plant can produce one singular tuber or several tubers which extend from stolons from a central corm (up to 20) depending on the species. The tubers can be cylindrical, curved or lobed, with brown, grey, black or pink skin and white, orange or purplish flesh. Most yams are annual plants, harvested after one season, but some are perennial with tubers increasing in size each year with the vines dying back at the end of the growing season and regrowing on the return of favorable conditions. The origin of yams is uncertain and genetic information suggests that there may be more than one point of origin.