Transpiration and translocation and factors affecting transpiration
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (18 张)
what are the 3 substances that can leave/exit the stomata
carbon dioxide enters oxygen leaves water leaves
define transpiration
the loss of water from a plant (mainly through the leaves)
define transpiration stream
the continuous movement of water from the roots, up the xylem to the leaves where it is lost by transpiration
when a leaf is covered in a plastic bag what will happen
water is absorbed from the soil by the roots by osmosis .The water enters the xylem in the root .It moves up the stem though the xylem to the leaves as part of the transpiration stream. In the leaf the water evapourates by the heat and form water vapour in the air spaces inside the leaf. The water vapour diffuses out through the stomata in the bag.
how is the transpiration stream useful
provides water to the leaves for photosythesis water flow carries useful mineral ions up the plant evaporation of the water can help cool the plant water makes sure cells throughout the plant remain turgid
note transpiration works when water evaporates inside the leaf and then water vapour diffuses out through the stomata
KEEP GOING POOKS PLSSSS U GOT THIS PROVE THEM WORNG SWEATY
does higher temp increase or decrease rate of transpiration (explain process)
increase water molecules have more kinetic energy so the rate of they diffuse out of the stomata increases
does more sunlight /light intensity increase or decrease rate of transpiration (explain process)
increase stomata remain open to allow carbon dioxide to diffuse into the plant for photosynthesis
does more air current/increased wind speed increase or decrease rate of transpiration (explain process)
increase water vapour that has just diffused out of the leaf is removed maintaing a steeper water potential gradient and increasing rate of transpiration
does more stomata increase or decrease rate of transpiration (explain process)
increase water loss will increase as there is more space through which the water molecules can move out of the leaf
does higher humidity increase or decrease rate of transpiration (explain process)
decrease there is a less steep water concentration gradient between the airspaces in the leaf and the air outside so transpiration rate decreases
does less stomata increase or decrease rate of transpiration (explain process)
decrease there is less space through which the water molecules can move out the leaf
when testing an transpiration experiment why is a plastic bag sometimes used to cover the plant pot
to prevent water from evaporating from the soil
why does a plant need to keep stomata open even though it means it will lose water to the environment
to allow carbon dioxide to enter the leaf for photosythesis
what would happen if i put vaseline on the bottom of a leaf compared to a normal one
very little water will be lost as vaseline blocks the stomata so wate cannot escape
what is translocation
the movement of sugars around the plant
how do aphids get food and what is special about their poo?
they pierce the plant tissue until they reach the phloem and suck out the sugary sap they excrete lots of sugar called honeydew(this attracts ants which sometimes protect aphids from predators)
why are hairs inside the stomata so importent
they trap moisture reducing water potential gradient between the inside of the leaf and the air outside the stomata helping the plant conserve water