Sciences - Co-ordinated (9-1) - 0973 CIE

Water Uptake

Gbogbo ọrọ náà

All the water a plant uses, for photosynthesis, for support and for cooling, starts its journey in the soil and enters through the roots. The entry point is a special cell built for the job: the root hair cell, whose long thin extension reaches between soil particles to drink in water.

In this lesson you will learn how root hair cells are adapted, follow the exact pathway water takes from soil to leaf, and meet a simple staining experiment that lets you see that pathway for yourself. You will also use magnification to work out the real size of a root hair cell from an image.

Ebumnobi

Identify in diagrams and images root hair cells and state their functions
State that the large surface area of root hairs increases the uptake of water and mineral ions
Outline the pathway taken by water through the root, stem and leaf as: root hair cells, root cortex cells, xylem, mesophyll cells
Investigate, using a suitable stain, the pathway of water through the above-ground parts of a plant

Akọmọ Ojú-ẹkọ

A plant that cannot take up water wilts and dies. Root hair cells are a classic example of a cell adapted to its function, and the soil-to-leaf pathway links straight into transpiration and translocation. Examiners often ask you to identify a root hair cell and explain its adaptation, or to put the pathway of water in the correct order.

Ọ dị na ngwa Green Bridge

Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Water Uptake. 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.

Root hair cells are adapted for absorbing water mainly because they have a: A. thick waxy cuticle B. large surface area C. store of starch D. green colour Answer: B
Water is absorbed into a root hair cell by: A. active transport B. respiration C. osmosis D. transpiration Answer: C
The correct pathway of water through a plant is: A. xylem, root hair cells, cortex, mesophyll B. root hair cells, root cortex cells, xylem, mesophyll cells C. mesophyll, xylem, cortex, root hairs D. root hairs, xylem, mesophyll, cortex Answer: B
An image of a cell is 40 mm long and the cell is actually 2 mm long. The magnification is: A. x2 B. x20 C. x40 D. x80 Answer: B
Mineral ions are taken into root hair cells by: A. osmosis B. active transport C. transpiration D. diffusion only Answer: B