1) If a mutation caused a seed to lack cotyledons, what would be the effect on t
ID: 209087 • Letter: 1
Question
1) If a mutation caused a seed to lack cotyledons, what would be the effect on the embryo?
a) it would lack food source
b) it would lack the formative elements for leaves
c) it would lack chloroplasts and be unable to undergo photosynthesis
d) it would lack formative elements for root structure?
2) Noting that the intestine is the site of nutrient absorption, how might the typlosole in the intestine aid in this function?
a) no effect
b) decreases surface area
c) increases surface area
3) Although they are the most abundant class of echinoderms, comparatively little is known about ophiurods. Why is this true?
a) brittle stars avoid light
b) brittle stars move rapidly
c) sea stars move more slowly and are more readily caught and observed
d) all choices are correct
Explanation / Answer
1.b)it would lack the formative elements for leaves.
During germination of plants, cotyledons is responsible for the formation of structure which we can call as first leave. So if the mutation affects cotaledons, the plant will lack formal elements for leaf structure.
2c) increases surface area
typlosole is present in the earthworm. They arw found in the dorsal flap of the intestine. It helps to increase the surface area in the intestine , so that intestine can absorb more.
3. d) all choices are correct.
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