Contents
- 1 Why are cytokinins typically used in flower shops?
- 2 Which of the following hormone that helps the plants to respond to drought stimuli is?
- 3 How do plant and animal hormones differ?
- 4 What happens immediately after a phytochrome is activated by light?
- 5 What is the role of cytokinins?
- 6 Who invented auxin?
- 7 Which hormone is called the dormancy hormone?
- 8 Which hormone responsible for seed germination?
- 9 Why are axillary buds often inhibited from growing even though a stem may be actively elongating?
- 10 Which plant hormone is used to prolong storage life of flowers?
- 11 What role do Plasmodesmata play in plant cells?
- 12 Which organism does not cause disease in plants?
- 13 What does PR and PFR stand for?
- 14 Which wavelengths are the most effective in Photoperiodism?
- 15 What happens to the pigment phytochrome during the night?
Why are cytokinins typically used in flower shops?
Why are cytokinins typically used in flower shops? They prolong plant life and keep leaves green. Hormones communicate between plants and signal to ripen also the release of ethylene helps this.
Which of the following hormone that helps the plants to respond to drought stimuli is?
ethylene. The closing of stomata is a process that is controlled by the plant hormone abscisic acid. Thus under conditions of drought, the plants increase the production and release of abscisic acid, thus closing the stomata to prevent loss of water by transpiration. Thus the correct answer is [e], abscisic acid.
How do plant and animal hormones differ?
Potentially every cell in a plant can produce plant hormones. In contrast, many animal hormones are produced only in specific glands. Plants do not have specialized hormone -producing glands. Hormones regulate a variety of plant behaviors in response to different stimuli or environmental conditions.
What happens immediately after a phytochrome is activated by light?
What happens immediately after a phytochrome is activated by light? Ca2+ channels are opened and guanylyl cyclase is activated. You are interested in determining what part of a plant is actually sensitive to light for phototropism.
What is the role of cytokinins?
Cytokinins (CK) are a class of plant growth substances (phytohormones) that promote cell division, or cytokinesis, in plant roots and shoots. They are involved primarily in cell growth and differentiation, but also affect apical dominance, axillary bud growth, and leaf senescence.
Who invented auxin?
In 1928, Dutch botanist Fritz W. Went finally isolated auxin diffused out from the tip of oat coleoptiles in the gelatin block. Following Went’s success, auxin, indole-3-acetic acid (IAA) was then isolated first from human urine, then from fungi, and finally from higher plants.
Which hormone is called the dormancy hormone?
Abscisic acid (ABA) is the sole plant hormone known to maintain seed dormancy; it acts through a gene expression network involving the transcription factor ABSCISIC ACID INSENSITIVE 3 (ABI3).
Which hormone responsible for seed germination?
The plant hormone gibberellins are necessary for seed germi- nation. The Signaling pathways of hormone can stimulate seed germination through the release of coat dormancy, “weakening of endosperm”, and “expansion of embryo cell”.
Why are axillary buds often inhibited from growing even though a stem may be actively elongating?
Why are axillary buds often inhibited from growing even though a stem may be actively elongating? Axillary buds are high in abscisic acid that prevents elongation.
Which plant hormone is used to prolong storage life of flowers?
Types of Plant Hormones
Hormone | Function |
---|---|
Ethylene | Fruit ripening and abscission |
Gibberellins | Break the dormancy of seeds and buds; promote growth |
Cytokinins | Promote cell division; prevent senescence |
Abscisic Acid | Close the stomata; maintain dormancy |
What role do Plasmodesmata play in plant cells?
1. Plasmodesmata. Plasmodesmata form an important route for communication between plant cells. They regulate cell -to- cell communication, thus enabling the differentiation of plant organs and tissues.
Which organism does not cause disease in plants?
Auxin accumulates in cells on the side of the plant opposite the source of light and causes them to shorten. Which organism does not cause disease in plants? Bacteria.
What does PR and PFR stand for?
Key Points. Exposure to red light converts the chromoprotein to the functional, active form ( Pfr ), while darkness or exposure to far-red light converts the chromophore to the inactive form ( Pr ).
Which wavelengths are the most effective in Photoperiodism?
Thus, based on the above information, we can conclude that the red and far-red wavelengths are the most effective in photoperiodism. Hence, the correct answer is option (D). Note: Photoperiodism is the effect of the duration of the light or the photoperiod on the flowering of the plants.
What happens to the pigment phytochrome during the night?
Therefore, at dawn, all the phytochrome molecules in a leaf quickly convert to the active Pfr form, and remain in that form until sunset. In the dark, the Pfr form takes hours to slowly revert back to the Pr form. If the night is long (as in winter), all of the Pfr form reverts.