Root hairs are MOST abundant: Which of the following is NOT one of the major pla

Question

Root hairs are MOST abundant:

Which of the following is NOT one of the major plant hormones?

The highly productive varieties of wheat and rice that were developed in the Green Revolution produce lots of seeds. Given that evolutionary fitness is measured in terms of reproductive success (for which total seed production is a good proxy), why might natural selection have failed to produce these highly productive varieties on its own, without the work of human-plant breeders?

Short-day plants flower in the _____ leaving enough time to complete seed development before _____. early spring; the next spring late summer; winter autumn; spring early spring; autumn

Root hairs are MOST abundant:

at branch points in the root. in areas of woody growth along the root. near the root tip. near the top of the root at the soil surface.

Which of the following is NOT one of the major plant hormones?

calcitonin auxin gibberellic acid abscisic acid ethylene

The highly productive varieties of wheat and rice that were developed in the Green Revolution produce lots of seeds. Given that evolutionary fitness is measured in terms of reproductive success (for which total seed production is a good proxy), why might natural selection have failed to produce these highly productive varieties on its own, without the work of human-plant breeders?

Green Revolution crops require too much water to develop normally without irrigation. Green Revolution crops have reduced stem elongation and thus are poor competitors for sunlight compared to wild plants. Green Revolution crops have reduced root elongation and thus are sensitive to natural droughts. Green Revolution crops require too much nitrogen to develop normally without added fertilizer.

Explanation / Answer

1) short day flower plants are those plants which require light less than about 12 hours to form the flower. mostly spring and fall flowering plants are short-day plants.

Short-day plants flower in the early spring; leaving enough time to complete seed development before autumn.

2) Root hairs are MOST abundant: near the root tip.

root tip then root meristem then zone of elongation and root hair zone.

3) Which of the following is NOT one of the major plant hormones - calcitonin.

calcitonin is a human hormone.

4) Green Revolution crops require too much nitrogen to develop normally without added fertilizer.

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