Diffusion is very important to plants since:
1. The cells have a permeable cell wall
2. It is the only means for gaseous movement within the plant body.
3. Plants cannot transport material by active transport.
4. They are unable to move towards the source of the nutrients.
If a pressure greater than atmospheric pressure is applied to a solution, its water potential:
3. Remains same
4. Becomes zero
For imbibition to occur the pre-requisites is/are
i. Water potential gradient between the adsorbent and the liquid imbibed.
ii. Affinity between the adsorbent and the liquid imbibed.
1. Only i
2. Only ii
3. Both i and ii
4. Neither i or ii
Water movement in plants is:
1. Down a potential gradient in apoplast and up the potential gradient in symplast
2. Down a potential gradient in symplast and up the potential gradient in apoplast
3. Up the potential gradient in both apoplast and symplast
4. Down the potential gradient in both apoplast and symplast
What per cent of water reaching them is used by leaves in photosynthesis?
1. Less than 1%
2. About 5 %
3. About 5 % in warm conditions and about 10 % in cold conditions
4. About 50 %
Attraction of water molecules to polar surfaces [such as the surface of tracheary elements] is called as:
What are the control points where a plant adjusts the quantity and types of solutes that reach the xylem?
1. Cellulose deposited casparian strips
2. Transport proteins of endodermal cell
3. Sclerenchyma around the pericycle
4. The root hairs themselves
Consider the following two statements:
I. The direction of movement in the phloem is bi-directional.
II. The source-sink relationship in plants is variable.
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. Both I and II are incorrect
During translocation of sugars in plants from source to sink:
1. The loading of sugar at source is by active transport and unloading at the sink is by passive transport.
2. The loading of sugar at source is by passive transport and unloading at the sink is by active transport.
3. Both loading at the source and unloading at the sink are by active transport.
4. Both loading at the source and unloading at the sink are by passive transport.
1. Water is lost from the cytoplasm but not from the vacuole
2. Water is first lost from the cytoplasm and then from the vacuole
3. Water is first lost from the vacuole and then from the cytoplasm
4. Water is lost from the vacuole but not from the cytoplasm