Available Answers

1. 1.

   Name of the following.

   1. The outermost, single layer of cells of the roots.
   2. The part of the roots that absorbs water front the soil
   3. The form in which food is transported from leaves to other parts of the plants.
   4. The form in which sugar is made by plants during photosynthesis.
   5. The tissue made up of vessels and tracheids.
2. 2.

   Give technical terms for the following.

   1. The process by which water absorbed by the roots from the soil.
   2. The region of root lying towards the inner side of the epidermis.
   3. Water and dissolved minerals that have been brought up to the xylem.
   4. The process of loss of water vapour from the aerial parts of a plant.
   5. The tissue whose main elements are sieve tubes and the sieve plates.
   6. The process by which food is manufactured in the leaves.
3. 3.

   Write T for True and F for False. Correct the False statements.

   1. Root hairs are present in the root cortex.
   2. Osmosis causes water to move from the root hair cells to the cortex.
   3. The movement of molecules against the concentration gradient does not require energy.
   4. The rate of transpiration increases with an increase in temperature.
   5. Lesser the speed of wind. higher is the rate of transpiration.
4. 4.

   Choose the correct option to fill in the blank.

   1. Water enters the plant cells from the soil  through the ________ (roots/leaves).
   2. Water enters the roots cells through a ________ (semi-permeable/permeable) plasma membrane.
   3. The force responsible for transport of water from cortical cells to root xylem is _________ (Transpiration pull / Root pressure).
   4. ___________ (Transpiration / Diffusion) and active transport are the methods involved in the absorption of mineral ions by roots.
   5. The movement of molecules from a region of their higher concentration to a region of their lower concentration in both regions is equal, is called ________ (osmosis/diffusion).
   6. The energy required for active transport is obtained from ________ (photosynthetic / respiring) root cells.
5. 5.

   Root hairs help to absorb water. Give reasons.

6. 6.

   Active transport requires energy. Give reasons.