26th Dec Transport in Plants Quiz 1 – Punjab Meritorious School Preparation Portal

Welcome to your 26th Dec Transport in plants Quiz 1 CBT TEST

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Consider the following two statements:

The direction of movement in the phloem is bi-directional
The source-sink relationship in plants is variable

Both I and II are correct and II explains I

Both I and II are correct but II does not explain I

I is correct but II is incorrect

Both I and II are incorrect

It is a common observation that CAM plants are not tall. The reason most likely as:

They would be unable to move water and minerals to the top of the plant during the day

They would be unable to supply sufficient sucrose for active transport of minerals into the roots during the day or night

Transpiration occurs only at night, and this would cause a highly negative in the roots of a tall plant during the day

Since the stomata are closed in the leaves, the Casparian strip is closed in the endodermis strip is closed in the endodermis of the root

In guard cells when sugar is converted into search, the stomatal pore

Opens partially

Closes completely

Opens completely

Remains unchanged

Attraction of water molecules to polar surfaces [such as the surface of tracheary elements] is called as:

Connation

Adnation

Cohesion

Adhesion

What per cent of water reaching them is used by leaves in photosynthesis?

Less than %

About 5%

About 5% in warm conditions and about 10% in cold conditions

About 50%

Diffusion is very Important to plants since:

The cells have a permeable cell wall

It is the only means for gaseous movement within the plant body

Plants cannot transport material by active transport

They are unable to move towards the source of the nutrients

In a pressure greater than atmospheric pressure is applied to a solution, its water potential:

Increases Ans

Decreases

Remains same

Becomes Zero

What are the control points where a plant adjust the quantity and types of solutes that reach the xylem?

Cellulose deposits casparian strips

Transport proteins of endodermal cell

Sclerenchyma around the pericycle

The root hairs themselves

What logging or over-watering a plant is dangerous and may kill the plant. Why is this so?

Water does not have all the necessary minerals a plant needs to grow

Water neutralizes the pH of the soil

The roots are deprived of oxygen

Water lowers the water potential of the roots

During translocation of sugars in plants from source to sink:

The loading of sugar at source is by active transport and unloading at the sink is by passive transport

The loading of sugar at source is by passive transport and unloading at the sink is by active transport

Both loading at the source and unloading at the sink are by active transport

Both loading at the source and unloading at the sink are by passive transport

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