Transport in Plants Test

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Transport in Plants Test - 60

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Question 1
1 / -0

Root pressure is high when __________________.

A
Transpiration is high and absorption of water is low.

B
Transpiration is low and absorption of water is high.

C
Transpiration is low and absorption of water is low.

D
Transpiration is high and absorption of water is high.
Question 2
1 / -0

Medicinal plant harvested from wild for anticancer compound is

A
Taxus baccata

B
Datura stramonium

C
Rauwolfia serpentina

D
Ocimum sanctum
Solution
- Taxus baccata is a conifer originally known as yew, though with other related trees becoming known, it may now be known as common yew, English yew, or European Yew. It is native to western, central and southern Europe, northwest Africa, northern Iran and southwest Asia.
- Pharmaceutical companies make paclitaxel (Taxol), a prescription drug for the treatment of breast and ovarian cancer, from the bark of the yew tree. They extract paclitaxel, leaving the poisonous chemicals in yew behind.
- Hence Medicinal plant harvested from wild the for anticancer compound is Taxus baccata.
- So, the correct answer is 'Taxus baccata'.
Question 3
1 / -0

To cut stem, xylem sap come out due to ____________.

A
Transpiration

B
Guttation

C
Root pressure

D
None of the above
Question 4
1 / -0

In 0.1 M solution of a non electrolyte, $$\psi_w$$ value will be

A
Zero bar

B
+2.3 bar

C
-2.3 bar

D
-22.4 bar

Solution

The water potential of pure water is zero. Water potential is total of solute potential and pressure potential. Here, the pressure potential is zero.
Hence, the water potential = solute potential = -iCRT where,
i = ionization constant = 1
C = 0.1 M
R = pressure constant = 0.08314 litre/mole
T = Temperature 298 K.
Hence, water potential = -1 x 0.1 x 0.08314 x 298 = -2.3 bar.
Thus, the correct answer is '-2.3 bar.'
Question 5
1 / -0

Go through the following statements
I. In active transport, pumps are proteins that use energy for transportation of molecules against the concentration gradient.
II. Carrier protein is very specific
III. Transport rate reaches a maximum when all the active protein transporter are used and saturated

A
All are correct

B
None is correct

C
I and III are correct

D
II and III are correct
Question 6
1 / -0

The mechanism of transpiration in plants is performed by:

A
Stem

B
Only leaves

C
Flowers

D
All of these

Solution

Water loss by transpiration may take place from any part of the plant exposed to external atmosphere. It occurs, however, principally from the leaves and is known as foliar transpiration. Only, a relatively small quantity of water is transpired from the stem and is called cauline transpiration.
So, the correct answer is D.
Question 7
1 / -0

Which of the following plant materials, is an efficient water imbibant?

A
Lignin

B
Pectin

C
Agar

D
Cellulose
Question 8
1 / -0

If three cells X, Y, and Z are joined to each other and their solute potential & turgor pressure values are given in the figure; then demonstrate the direction for the flow of water in this system:

A

B

C

D

Solution

Water potential in a system depends on the number of water molecules. Water always flows from high water potential to low water potential. We can calculate water potential in a system by the algebraic sum of solute potential and pressure potential. Thus water potential in cells X, Y, and Z works out to be respectively -25, -10, and -15 units. This indicates the movement of water shall be from Y to X and Y to Z. From Z water shall flow to X. So the correct answer is option C
Question 9
1 / -0

The atmospheric pressure is $$760\ mm\ Hg$$ at the sea level. Which of the following ranges is nearest to the partial pressure of $$CO_{2}$$ in $$mm\ Hg$$?

A
$$0.30 - 0.31$$

B
$$0.60 - 0.61$$

C
$$3.0 - 3.1$$

D
$$6.0 - 6.1$$
Question 10
1 / -0

In given diagram correct order of solute potential would be (where $$'\rightarrow'$$ represents the movement of the water ):

A
A < B > C

B
A = B < C

C
C > A > B

D
A= C< B

Solution

Solute potential decreases with the increase in the solute concentration. Water moves from the lower solute concentration to the higher solute concentration. The phenomenon is called as osmosis. In the given diagram, B is having the highest solute concentration following by A followed by C. Hence, the order of solute potential will be C > A > B because water is moving from C to A and A to B.
Thus, the correct answer is option C.