Functions are:
Sieve tubes: It conduct food materials prepared in the leaves and greener young stems to all parts of plants.
Companion cells: It helps sieve tubes in conduction of food materials.
Pholem parenchyma: It helps to store food.
Pholem fibres: It provide mechanical strength to plants.
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A cube of side 5cm is immersed in water and then in saturated salt solution. In which case will it experience a greater buoyant force. If each side of the cube is reduced to 4cm and then immersed in water, what will be the effect on the buoyant force experienced by the cube as compared to the first case for water. Give reason for each case.

The speed-time graph of an ascending passenger lift is given alongside.
What is the acceleration of the lift:

