It was observed during the early 20th century that the abscission zone of leaves of tree growing close to gas burning street lamps weakened (entered the abscission phase) earlier than trees located further away from the lamps. Experiments showed that weakening of the abscission zone was not caused by either the lamp's light or heat. Instead the research on this phenomenon led to the discovery of a new gaseous plant hormone. What is this hormone? Ethylene Abscisic acid (ABA) Gibberellins Auxin Strigolactone Cytokinin

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A: Auxins are phytohormones (hormones produced by plants) that are secreted in the stem tips with…

Q: Which of the following is not a characteristic of plant hormones? They are active in small…

A: Plant hormones like Auxin, Cytokinin, etc. are produced at extremely low concentrations. At very…

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Q: why is the phytochrome receptor of plant cells blue in color?

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Q: What are three plant defense mechanisms and what are the physiological costs and consequences of…

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Q: Vhich of the following hormones are NOT mat unction? D abscisic acid- promotes leaf abscission O…

A: Ans- Abscisic acid promotes leaf abscission. Abscisic acid promotes leaf senescence.…

Q: Which of these is caused by the effects of auxin? (choose all that apply) 1.Maintaining apical…

A: Answer :- As we know that Auxins are powerfull development harmone created by plant normally. They…

Q: During seed germination, the plant hormone which belongs to a large family of terpenoid growth…

A: Plants are organisms with eukaryotic cells having cell walls and are capable of synthesizing their…

Q: Describe in your own words, how the experiments featured demonstrate the role of the plant hormone…

A: Plant Hormones are massenger which are organic in nature and control the growth and differentiation…

Q: Can you answer this question, all of the parts please.  A. Please explain the phenomenon of apical…

A: Apical dominance can be defined as the control exerted by the apical portions of the shoot over the…

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A: Cells have several molecules called biomolecules.

Q: Which of the following statements about gravity perception is FALSE? A. Statoliths are specialized…

A: Gravity perception is an important activity in plants as they need to send their roots downwards…