Q3 of 67 Page 48

Complete the following statements:

The bending movements of certain flowers towards the sun and the sleep movements of certain plants at night are examples of ..............

Turgor pressure is the pressure exerted by the contents of the cell upon its cell wall when they are in a turgid state. The sun facilitates the suction pull of water from the soil thus keeping the cells turgid during the morning by transpiration but soon the leaves wilt due to loss of turgidity during the night. Thus certain flowers bend towards the sun and some plants show sleep movements at night.


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3

Complete the following statements:

Hypotonic solution is one in which the solution kept outside the cell has lower solute concentration than .............. the cell.

 3

Complete the following statements:

Active transport is one in which the ions outside the roots move in with expenditure of energy ...........

 4

Fill in the blanks by choosing the correct alternative from those given in brackets.

When placed in a more concentrated solution, the cell contents will ......... (Shrink / swell up)

 4

Fill in the blanks by choosing the correct alternative from those given in brackets.

The pressure by which the ......... molecules tend to cross the semi-permeable membrane is called osmotic pressure. (Salt / water)