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Complete question:
The movement of auxin from the apical to basal sides of immature leaf cells and toward the xylem and phloem of the stem is an example of _____ transport.
polar
trophic
paraxial
bidirectional
Answer:
Polar
Explanation:
Auxin is one of several plant hormones. It is a group of several natural and synthesized plant hormones. Auxin is mainly produced in the apical meristem of the shoot. The synthesized auxin in shoot meristem moves downwards along the axis of shoot and root. Since this movement occurs in one direction only, it is also called unidirectional or polar movement. It is always transported downwards. Auxins are also produced in young leaves and seeds.
Answer: Insulin Growth factor 1 (IGF-1)or Somatomedin C.
This is a <u>peptide hormone produced in the liver with a profound effects on growth at childhood stage. </u> Its secretion begins <u>slowly at infancy</u>, reaches<u> peak at puberty,</u> where it <u>influences growth sprout and remains at the plateau at old old age</u>. This secretion is stimulated by the <u>Growth hormone</u>.GH
However, its secretion is inhibited, by malnutrition, absence of Growth hormones receptors, non-response to Growth hormones stimulation; and blood concentration levels varies with insulin levels, types of nutrition, exercise and age.
Elevated Levels
Growth hormones is release into the blood stream from the pituitary gland.This is followed by its stimulation of synthesis of IGF-1 by the liver. <u>This hormone in-turn promotes the growth of the body systems which occurred by promoting the growth of cells of the body of certain organs especially; of the skeletal muscles, bones kidney, liver etc. </u>
The elevation of blood levels of GH, leads to corresponding over-stimulation of the liver to produce IGF-1. This leads to increase in system growth of body cells through rapid growth of general body cells.and thereforeT growth sprout.