Transpiration
Akopọ
On a hot day a single tree can pull hundreds of litres of water up from its roots to its leaves, where most of it simply evaporates away. This loss of water vapour, transpiration, is the engine that drives water all the way up a plant, with no pump at all.
In this lesson you will learn what transpiration is, how temperature and wind speed change its rate, and how to measure it. Extended students will explain the transpiration pull that lifts water up tall trees, how leaf structure and stomata control water loss, and why a short of water makes a plant wilt.
Awọn Afojusun
- Describe transpiration as the loss of water vapour from leaves
- State that water evaporates from the surfaces of the mesophyll cells into the air spaces and then diffuses out of the leaves through the stomata as water vapour
- Investigate and describe the effects of variation of temperature and wind speed on transpiration rate
- [Supplement] Explain how water vapour loss is related to: the large internal surface area provided by the interconnecting air spaces between mesophyll cells and the size and number of stomata
- [Supplement] Explain the mechanism by which water moves upwards in the xylem in terms of a transpiration pull that draws up a column of water molecules, held together by forces of attraction between water molecules
- [Supplement] Explain the effects on the rate of transpiration of varying the following factors: temperature, wind speed and humidity
- [Supplement] Explain how and why wilting occurs
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Transpiration. 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.
- Transpiration is best defined as the: A. uptake of water by roots B. loss of water vapour from leaves C. movement of sugar in phloem D. loss of mineral ions Answer: B
- Which change increases the rate of transpiration? A. higher humidity B. lower temperature C. higher wind speed D. still air Answer: C
- Water vapour leaves the leaf mainly through the: A. xylem B. stomata C. cuticle D. phloem Answer: B
- [Supplement] The water column in the xylem does not break because of: A. active transport B. cohesion between water molecules C. lignin pumping water D. osmosis in the leaf Answer: B
- A potometer bubble moves 60 mm in 5 minutes. The rate of uptake is: A. 5 mm/min B. 12 mm/min C. 60 mm/min D. 300 mm/min Answer: B
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Transpiration? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
Ṣe igbasilẹ ohun elo naa lori Google Playstore
Gbogbo ohun ti o nilo lati ṣe dara julọ ninu JAMB, WAEC ati NECO.
