Q15 of 67 Page 58

Salt is applied to tennis lawns to kill weeds. How does salting tennis lawns help in killing of weeds without affecting the grass?

Salt solution being hypertonic, causes exo-osmosis in plants. 1 cup salt in 2 cup of water, fairly well dissolved when sprayed on weed plants, start killing them.


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13

When a freshly collected Spirogyra filament is kept in a 10% potassium nitrate solution, it is observed that the protoplasm shrinks in size:

a. What is this phenomenon called?


b. What will happen if the filament is replaced in distilled water?


 14

Sugar crystals do not dissolve easily in ice cold water. Explain.

 16

What is the chemical composition of xylem and phloem sap?

 17

Observe the figure and answer the question provided below the figure.

Chp11.6.png


Why does tube B show higher water rise than A?