Multiple Choice
The closest seedless relatives of seed plants produce one kind of spore that gives rise to a bisexual gametophyte. What does this suggest about the ancestors of seed plants?
28. Plants
Seed Plants
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Six major crops˜wheat, rice, maize, potatoes, cassava, and sweet potatoes˜contribute disproportionately to human diets. What percentage of all the calories consumed by humans is supplied by these crops?
A
50%
B
30%
C
90%
D
65%
E
80%
Verified step by step guidance1
Identify the six major crops mentioned: wheat, rice, maize, potatoes, cassava, and sweet potatoes.
Understand that these crops are significant contributors to the human diet, providing a large portion of the calories consumed globally.
Recognize that the problem is asking for the percentage of total calories consumed by humans that are supplied by these six crops.
Consider the options provided: 50%, 30%, 90%, 65%, and the correct answer given as 80%.
Reflect on the importance of these crops in global agriculture and food supply, which supports the high percentage of 80% of calories they provide.
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