Most of the water movement in the roots via apoplast but it ultimately becomes symplastic because of the presence of ?
1. Cortex
2. Epidermis
3. Limiting layer of cortex
4. Pericycle
Which of the following is not associated with root pressure?
1. Guttation
2. Helps in re-establishing water column, when it breaks.
3. Positive pressure.
4. Accounts for bulk of water transport.
The rate of upward movement of in plant is upto?
1. 20 m / hr
2. 15 m / hr
3. 25 m/hr
4. 30 m/hr
How many of the following statements are correct?
(a) Less than one percent of water reaching the leaves is used in photosynthesis and plant growth.
(b) Turgidity of guard cells play very important role in stomata opening and closing.
(c) In dorsiventral leaf upper surface has greater number of stomata.
(d) In guard cells cellulosic microfibrils are oriented radially.
Options:
1. 4 2. 3
3. 2 4. 1
Which of the following dues not help in stomatal opening and closing :
1. Turgidity of guard cell.
2. Differential thickening of guard cell wall.
3. Orientation of cellulosic microfibrils in guard cell.
4. Size of stomatal pore
The transpiration driven ascent of sap depends upon following physical property of water except
1. Cohesion 2. Tensile strength
3. Adhesion 4. Surface tension
The physical property of water that is cohesion, adhesion and surface tension is responsible for?
1. Tensile strength
2. Capillarity
3. Both 1. and 2.
4. Percolation
In plants capillarity is added by
1. Small diameter of the treachery elements
2. Presence of lignin in treachery elements
3. Small size of the treachery elements
4. Dead nature of the treachery element
The plants are twice efficient with respect to plants because
1. They have ability to maximize availability of while minimizing loss.
2. They have low requirement with minimum loss.
3. There stomata remains always open and high water loss.
4. There stomata open during night, and minimum loss.
How many of the following statement is correct for transpiration
(a) Help in creation of transpirational pull.
(b) Supplies for photosynthesis.
(c) Cool leaf surface by 10 – 15°C.
(d) Helps in maintaining shape and structure of the plants.
Options :
1. 4 2. 3
3. 2 4. 1
Why all minerals are not absorbed by the roots passively?
1. Minerals are present in soil as charged particles.
2. Minerals are present in soil as neutral particles.
3. Mineral concentration in soil is higher than root.
4. Both 1. and 3.
How many of the following statements are correct?
(a) The active uptake of ions is partly responsible for the water potential gradient in roots.
(b) Specific proteins in the membranes of root hair cells actively pumps ions from the soil into the cytoplasm of epidermal cell.
(c) Endodermal cells have proteins which selectively transports protein across membrane.
(d) Transport proteins of endodermal cells acts as a control points, where quantity and types of solute is adjusted that reach the xylem.
Options :
1. 1 2. 2
3. 3 4. 4
The root endodermis has ability to actively transport ions in one direction only because :
1. Layer of suberin
2. Layer of lignin
3. layer of chitin
4. Layer of tylin
Match the following :
(1) |
Sink of nutrient |
1. |
Fine vein endings |
(2) |
Unloading of mineral |
2. |
Lateral meristeny |
(3) |
Mineral remobilisation |
3. |
Storage organs |
(4) |
Unloading of sugar |
4. |
Older parts |
Options :
1 2 3 4
How many of the following statements are correct?
(a) Xylem exudates contain some organic phosphorus and sulphur.
(b) The source sink relationship in food transport is reversible and depends on season.
(c) Phloem sap contains, H2O,sucrost, hormones amino acids.
(d) During tranlocation there is exchange of materials between xylem and phloem
Option :
1. 4
2. 3
3. 2
4. 1
Which of the following is not correct for phloem loading?
1. It is an active process
2. As a result of this hypertonic condition develops inside the phloem.
3. Responsible for pressure gradient in phloem.
4. During this glucose is loaded against the concentration gradient.
Sieve tube forms continuous filament this is due to?
1. Cytoplasmic strands
2. Plasmodesmata
3. Protoplasmic strand
4. Lenticels
Which of the following experiment is performed to show that transport of food takes place via phloem
1. Cobalt chloride test
2. Girdling experiment
3. Potometer
4. Split light experiment
Which of the following is a model for Transpiration?
1. Cohesion-AdhesionTranspiration Pull Model
2. Cohesion Tension Transpiration Pull Model
3. Tension Transpiration Pull Model
Osmotic pressure of a solution is
1. more than that of pure solvent
2. less than that of pure solvent
3. variable depending upon concentration
4. equal to that of pure solvent
Wilting occurs, when there is
1. higher relative humidity of atmosphere
2. absorption higher than transpiration
3. transpiration higher than absorption
4. excess root pressure
The opening of stoma is aided due to the orientation of the microfibrils in the cell walls of the guard cells. These microfibrils are
1. Proteinaceous.
2. Cellulosic.
3. Lipid derivative.
4. Polynucleotide chains.
Select the incorrect statement
1. In monocots, guard cells are dumb-bell shaped.
2. The positive pressure that develops in xylem is called root pressure.
3. Active transport is a downhill process.
4. Diffusion is a slow process.
In a flaccid cell
1. DPD = 0
2. DPD = OP
3. DPD > OP
4. DPD = TP
Read the following statements and choose the correct option.
Statement-A : Potassium pump theory explains that during opening of stomata in light, ion exchange is an active process.
Statement-B : PGR ABA is involved in closing of stomata.
1. Only statement A is correct.
2. Only statement B is incorrect.
3. Both statements are incorrect.
4. Both statements are correct.