Tropic Responses
Gbogbo ọrọ náà
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.
Ebumnobi
- 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
Nkuzi Olu
Gee ntị na nkuzi a na ngwa
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
Mepee maapụ uche na ngwa
Kaadị ncheta
Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.
Mee omume kaadị ndị a na ngwa
Akwụkwọ Ọmụmụ
Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge
Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Tropic Responses. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- 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
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Mụtakwuo ihe site na isi mmalite mepere emepe
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Akụkụ akwụkwọ
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
Ndị otu ndị ọzọ bipụtara ha n'okpuru ikike mepere emepe, anyị na-ekele ha dị ka ha si chọọ. Njikọ na-emepe saịtị ha.
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Tropic Responses? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
Budata Ngwa Ahụ Na Google Playstore
Ihe nile ichoro iji nwee ihe ịga nke ọma na JAMB, WAEC & NECO.
