26. Substances like water and ions can be absorbed through plant roots (and root

Question

26. Substances like water and ions can be absorbed through plant roots (and root hairs).        True
       False Question 27.27. Plants have adapted through evolution to have many defenses against pathogens (disease causing bacteria or viruses) and herbavores. Some of these include:        all of the responses are correct
       resistance to pathogens
       thorns and stickers
       chemical microbial killers
       chemical poisons and toxins Question 28.28. I prefer to use organic methods of weed control like pouring saltwater on the weeds that grow in my driveway. Others may choose to use weed killers like 2,4D which kills by disrupting plant hormones.        True
       False Question 29.29. Recently I purchased some "seen on TV" green bags to keep produce in. They are supposed to absorb the ethylene gas that fruit releases. The advertisement said the bags would prevent spoilage. This works because ethylene is a gas that is released and spread between fruit that signals for ripening. If the gas is removed the ripening should slow.        True
       False Question 30.30. Experimental plants that were sent up in space shuttle missions did not exhibit all of their normal tropisms. Which of the following responses would you expect a plant in a space shuttle not to exhibit?        phototropism
       photoperiodism
       gravitropism
       thigmotropism 26. Substances like water and ions can be absorbed through plant roots (and root hairs).        True
       False

Explanation / Answer

26      True .... fact based question no explination.

27        All of the responses are correct..... fact based question

28         False.... 24D is itself auxin harmone it works by overgrowing leaf shoots which ultimately break and kill weed... they do not disrupt endogenous harmones but are harmones themselves.

30. Gravitropism....because there would be no gravity it is a zero gravity environment....

29        True .....because removing ethylene ripening harmone will delay ripening ..and spoilage

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