A. Give reasons for the following.
1. Root hairs help to absorb water.
2. Active transport requires energy.
3. Transpiration helps in the upward movement of water.
4. Transpiration is faster when it is sunny and hot.
Answers
Answer:
Explanation:
1. Root hairs helps to observe water because this is their function. This happens because the soil water has a higher water potential than the root hair cell cytoplasm.Root hairs have a large surface area for absorption of water. Root hair function is to collect water, mineral and nutrients present in soil.
2. Because it is the passage of substance from it's Lower concentrations to higher concentrations. It is the just opposite of diffusion
3. Transpiration is the loss of water from the leaves for cooling the plant. It helps in upward movement of food and water because as the water is lost from leaf surface by transpiration, more water molecules (along with dissolved substances i.e. sap) are pulled up through continous column of xylem present from leaf to root.
4. Tranpiration is faster when it is sunny and hot as when it is hot water in the leaves evaporate faster (transpirate) .Therefore Transpiration is faster when it is sunny and hot.
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Answer:
Explanation:
root hairs have root cells which on absorption of water and nutrients becomes turgid
due to their turgidity, root cells in the root hairs pressurizes the surrounding cells and so water and nutrients are pushed forward and is transported to all the parts of plants
this is called root pressure
2]
active transports requires energy
in humans this is in the form of ATP molecules commonly known as energy currency
active transports like transportation of water and food through xylem and phloem respectively requires energy for their activation which is received through the nutrients of the soil,sunlight etc
3]
transpiration which takes place in bigger trees and plants
this too happens due to xylem conducting tissues which helps in upper supply of water
4]
sunny and hot weather helps vaporization of water through stomata
that is why transpiration is faster in hot and sunny weather