Na⁺ / K⁺ pump in a cell is an example of

osmosis
diffusion
passive transport
active transport

Under given suitable conditions, the DPD will be more than OP

When OP is equal to TP
When OP is less than TP
When OP is greater than TP
When TP is negative

Solution

When TP is negative, DPD will be more than OP, DPD of a cell mainly depends upon OP.

If the pressure potential is +0.16 megapascals (mPa) and the osmotic potential is –0.24 megapascals, then the water potential would be

+ 0.4 mPa
+ 0.08 mPa
– 0.08 mPa
+ 0.16 mPa

Solution

The water potential is the sum of the osmotic potential(usually negative) and the pressure potential (usually positive), so W.P. = – 0.24 + 0.16 = –0.08 mPa.

Mesophyll tissue of leaf is at water potential of –10.0 bars while epidermal cells of leaf have water potential of –8.0 bars and the air outside has water potential of –5.0 bars. Water will move from

air to epidermis to mesophyll
mesophyll to air to epidermis
mesophyll to epidermis to air
no where

Solution

Water potential is highest in air & lowest in mesophyll.

A plant cell placed in pure water will

expand until the osmotic potential or solute potential reaches that of water.
becomes more turgid until the pressure potential of cell reaches its osmotic potential.
become more turgid until the osmotic potential reaches that of pure water.
becomes less turgid until the osmotic potential reaches that of pure water.

Peeled potato is cut into halves and a cup-like cavity is made in its cut end. The potato piece is placed in a petri dish having ordinary water and some sugar crystals are placed in the potato cavity. After some time, sugar crystals will

be turned black
move into the water in petri dish
form sugar solution
remain unchanged

Transpiration rate is measured in an apple plant on both surfaces of leaves. It will be higher on

lower surface
upper surface
none of two surface
All of these

Solution

Stomata are found only on lower surface.

If two solutions have the same osmolarity. They are said to be

hypotonic
hypertonic
isotonic
None of these

Water potential of pure water and its solution are

0 and 1
0 and 0
0 and more than 1
0 and less than 1

The pathway of water from soil up to the secondary xylem:

Soil → root hair → cortex → endodermis → pericycle → protoxylem → metaxylem
Metaxylem → protoxylem → pericycle → cortex → endodermis → soil → root hair
Cortex → root hair → endodermis → pericycle → protoxylem → metaxylem
Pericycle → soil → root hair → cortex → endodermis → protoxylem → metaxylem

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