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7nadin3 [17]
3 years ago
12

Plant hormones: how do plant hormones affect plant growth and development? seeds do not usually sprout in the winter—how do they

know when to germinate? grocery stores need to have ripe, unbruised produce to sell to the public, but often this produce is packed weeks ahead of time and shipped hundreds of miles to get to the store. how does it ripen after harvest? there are several different plant hormones that help to orchestrate plant growth, development, ripening, and responses to various environmental stimuli.
Biology
1 answer:
bija089 [108]3 years ago
6 0

<span>The growth of plants is regulated by plant hormones. Some of the major hormones include; auxins, gibberellins, ethylene, abscisic acid, and cytokinin. Abscisic acid is a stress hormone that inhibits the growth of seeds during the scarcity of water such as during winter. Ethylene hormone promotes ripening of fruits. The hormone can exist in gaseous form and therefore if exposed to unripe fruits can induce ripening.  Auxins promote apical growth while gibberellins promote internodal growth  in stems </span>





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Some genes are important enough to be called "molecular switch" or "master" genes. What is the purpose of these genes?
trapecia [35]

Answer:

Genes called "molecular switch" or master genes have the purpose of control when other genes are expressed (option A).

Explanation:

Master gene is so named because it has the function of controlling the behavior of other genes, organizing their functions and regulating when they can be expressed.

The name of molecular switch is synonymous with the master gene, since its activation determines the genetic regulation necessary to establish cell differentiation and even the determination of the sex of some species.

The other options are not correct because:

<em>     B. Master genes do not </em><u><em>determine the organization of the genome</em></u><em> .</em>

<em>     C. </em><u><em>Regulation of cell metabolism</em></u><em> depends of substances as hormones and enzymes. </em>

<em>     D. </em><u><em>The rate of translation</em></u><em> does not depend on the activity of master genes.</em>

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Serous membranes are layers of tissue that protect the organs. They prevent the organs from getting damage from friction which can occur as they rub against the cavity walls.

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