Ethylene is best described as…单项选择题

A

the pigment that produces blue petal colors in flowers such as the Blue Himalayan poppy

B

a compound that interferes with scent receptors, making the flower fragrance undetectable after short exposure

C

a hormone involved in plant growth and responsible for abscission and senescence

D

a molecule that has been scientifically removed from flowers due to its ghastly scent

E

a commonly used insecticide until growers observed its negative effects on flower colors

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Question textTom is growing a plant and wants to encourage more branching in the shoot, while ensuring the roots grow downwards through the soil without branching, to ensure that the plant receives sufficient light for growth. To achieve this, he needs to understand how plant hormones and environmental responses influence growth and how nearby plants might affect light availability.Fill in the blanks using the terms below. Some terms may be used more than once, and some terms may not be used at all. Spelling must be accurate to obtain the marks.[table] auxin | light | ethylene | far red | apical bud development gravitropism | cytokinin | hydrotropism | phytochromes | meiosis gibberellin | thigmotropism | away | branching | meristematic tissue monoliths | water | statholiths | phytoplasts | chloroplasts gravity | towards | abscisic acid | Infra red | phototropism [/table]To promote shoot branching, Tom should reduce the concentration of the hormone Answer 1 Question 22[input], which normally inhibits lateral bud growth. He could also apply Answer 2 Question 22[input], a hormone that encourages cell division and shoot branching.To ensure the roots grow downward, Tom relies on the plant’s response to gravity, known as Answer 3 Question 22[input]. This process is guided by specialised organelles called Answer 4 Question 22[input], which settle in the root cap cells and help detect gravity.

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