Tropic Responses
Akopọ
Plants cannot walk towards the sunshine, but they can grow towards it. Put a seedling on a windowsill and within days its shoot bends to face the light. Plant roots, meanwhile, grow downwards no matter which way you plant the seed. These growth responses to direction are called tropisms.
In this lesson you will learn what phototropism and gravitropism are, how to investigate them in shoots and roots, and (for the extended curriculum) how the chemical auxin controls them by making one side of a shoot grow faster than the other.
Awọn Afojusun
- Describe gravitropism as a response in which parts of a plant grow towards or away from gravity
- Describe phototropism as a response in which parts of a plant grow towards or away from the direction of the light source
- Investigate and describe gravitropism and phototropism in shoots and roots
- [Supplement] Explain phototropism and gravitropism of a shoot as examples of the chemical control of plant growth
- [Supplement] Explain the role of auxin in controlling shoot growth, limited to: (a) auxin is made in the shoot tip (b) auxin diffuses through the plant from the shoot tip (c) auxin is unequally distributed in response to light and gravity (d) auxin stimulates cell elongation
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Oriire fun ipari ẹkọ lori Tropic Responses. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- A plant shoot growing towards light shows: A. positive gravitropism B. negative gravitropism C. positive phototropism D. negative phototropism Answer: C
- A root growing downwards towards gravity shows: A. positive gravitropism B. negative gravitropism C. positive phototropism D. negative phototropism Answer: A
- Auxin is made in the: A. root tip only B. shoot tip C. leaves D. flowers Answer: B
- When a shoot is lit from one side, auxin collects on the: A. lit side B. shaded side C. top D. roots Answer: B
- Auxin stimulates shoot cells to: A. divide only B. elongate C. die D. shrink Answer: B
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Awọn Iwe Itọsọna Ti a Gba Nimọran
Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
Plant Sensory Systems and Responses
Describe how red and blue light affect plant growth and metabolic activities
"Biology: Plant Sensory Systems and Responses" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/30-6-plant-sensory-systems-and-responses. Access for free at https://openstax.org/books/biology/pages/1-introduction
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