sharks rays and skates belong to the class Charles and Francis Darwin concluded

Question

sharks rays and skates belong to the class Charles and Francis Darwin concluded from their experiments on phototropism by grass seedlings that the part of the seedling detects the direction of light is the A) tip of the coleoptile. B) part of the coleoptile that bends during the response. C) base of the coleoptile. D) cotyledon. E) phytochrome in the leaves. Which of the following is a major mechanism whereby hormones control plant development? A) cell respiration via regulation of the citric acid cycle B) cell division via the cell cycle C) cell elongation through production of cellulase D) cell differentiation through altered spliceosome activity E) cell synthesis proteins via altered gene expression The ripening of fruit is principally controlled by A) auxins B) cytokinins. C)indole acetic acid. D) ethylene. E) carbon dioxide concentration (in air). Plant hormones produce their effects by A) altering the expression of genes. B) modifying the permeability of the plasma membrane. C) modifying the structu

Explanation / Answer

Q1. A is the correct answer

Q2 B is the correct answer

Q3 D is the correct answer

Q4 D is the correct answer

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