Plant Tissues, Organs And Systems
Gbogbo ọrọ náà
A leaf is a few tenths of a millimetre thick and has to do three incompatible things at once: catch as much light as possible, let carbon dioxide in, and avoid drying out in the sun that provides the light. The way it is layered is the compromise, and every layer is there for a reason you can work out.
In this lesson you will name the plant tissues the specification asks for, slice through a leaf and account for each layer, and learn where the xylem and the phloem sit in a root and in a stem. That last detail is small and easily forgotten, and the specification names it in writing as the one piece of internal structure you need beyond the leaf itself.
Ebumnobi
- Examples of plant tissues include: epidermal tissues, which cover the plant; palisade mesophyll, which carries out photosynthesis; spongy mesophyll, which has air spaces to facilitate diffusion of gases; xylem and phloem, which transport substances around the plant.
- Plant organs include stems, roots and leaves. Details of the internal structure of these organs are limited to the leaf and to the position of the xylem and phloem in a dicotyledonous primary root and primary stem.
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Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Plant Tissues, Organs And Systems. 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.
- Which plant tissue carries out most of the photosynthesis in a leaf? A. Epidermal tissue B. Palisade mesophyll C. Spongy mesophyll D. Phloem Answer: B
- What is the function of the air spaces in the spongy mesophyll? A. To store water B. To strengthen the leaf C. To facilitate the diffusion of gases D. To absorb light energy Answer: C
- Which pair of tissues transports substances around the plant? A. Palisade mesophyll and spongy mesophyll B. Xylem and phloem C. Epidermal tissue and palisade mesophyll D. Epidermal tissue and spongy mesophyll Answer: B
- Where are the xylem and phloem found in a dicotyledonous primary root? A. In a ring near the outside B. In the centre C. Just below the epidermis D. Scattered throughout Answer: B
- Which of these is a plant organ? A. Palisade mesophyll B. Xylem C. A leaf D. A chloroplast Answer: C
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