Ppsc lecturer Biology

PPSC Lecturer Biology Test 82 Online Preparation MCQs

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There will be 25 multiple choice question in the test.
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Test Instructions:-
Test Name	Lecturer Biology
Subject	Biology Test 82
Test Type	MCQs
Total Questions	25
Total Time	20 Minutes
Total Marks	100

You have 20 minutes to pass to the quiz.

PPPSC LECTURER BIOLOGY ONLINE PRACTICE TEST NO. 82

1 / 25

Through which pathway is the least water transported ?

Symplastic pathway

Vacuolar path

All of the above

Apoplastic pathway

2 / 25

Water absorption in roots takes place by which process ?

Active

Active and passive

Passive

Active absorption

3 / 25

How much water is used by plants to maintain its life ?

Less

No water

Very less

4 / 25

Which cells in the roots behave as regulators?

Epidermis

Cortex

Endodermis

Pericycle

5 / 25

Ascent of sap is the result of:

Root pressure

None of the above

Diffusion

Turgor pressure

6 / 25

The stomata closes under which circumstances ?

When water collects in guard cells

When guard cells loose turgidity

When water enters guard cells

When the turgidity of guard cells decreases

7 / 25

In monocots, which cells are associated with the stomata:

Only guard cells

Guard cells and accessory cells

Epidermal cells and accessory cells

Epidermal cells and guard cells

8 / 25

Transpiration is reduced under which circumstances ?

When it is airy/windy

In dry atmosphere

In humid soil

In humid atmosphere

9 / 25

Sink means:

Place where food is synthesized and stored

None of these

Place where food is stored

Place where food is required

10 / 25

In which pathway, the water movement doesnot face much barriers:

All of the above

Vacuolar path

Symplastic pathway

Apoplastic pathway

11 / 25

Which of the following shows the least water potential ?

Leaf cells

Stem cells

Cells of cortex

Root cells

12 / 25

The force present amongst water molecules is

Adhesive force

Cohesive force

Gravitational force

Friction force

13 / 25

Source means:

Where food is synthesized

Where food is stored

Place where food is digested

Where food is accepted

14 / 25

Which of the following is involved in the ascent of sap?

All the above

Surface tension

Cohesive force

Capillary action

15 / 25

Why can’t the mineral nutrients be absorbed passively ?

They are in ionic form. Plasma membrane is semi permeable. Their concentration is less in roots

They can pass from the plasma membrane

None of the above

They are in ionic form Plasma membrane is permeable and their concentration in roots is more

16 / 25

What is correct about ascent of sap?

Utilizes energy

None of these

Both of these

Against the gravitational force

17 / 25

What is the shape of the guard cells when they become turgid ?

Semicircular

Triangular

Elliptical

Crescent shaped

18 / 25

In dicots, where are the stomata located in maximum numbers ?

In leaf stalk

Dorsal surface of leaf

Ventral surface of leaf

Leaf margin

19 / 25

In which form does the excess water absorbed by the roots is lost ?

All of these

Liquid form

Gaseous form

None of these

20 / 25

Water can cross which of the following membranes in the transmembrane transport ?

None of these

Tonoplast (vacuolar membrane)

Cytoplasmic membrane

Both of these

21 / 25

Which organs take part in the process of transpiration ?

Only stem

Roots

Only leaves

Stem and leaves

22 / 25

As the turgidity of the guard cells increases, the pore of the stomata:

Becomes very narrow

Gets closed

Becomes narrow

Becomes broader

23 / 25

The mineral nutrients reach the leaves through which path ?

Transpiration path

Phloem

Apoplast path

Symplast pathway

24 / 25

Ascent of sap means:

Transport of water and salts towards the root system and stem

Transport of food from the leaves for the roots

Transport of water and mineral salts absorbed by the root system towards the stem and leaves

Transport of food prepared in leaves towards the buds

25 / 25

Food is stored in which form in the cells of the roots ?

Lipids

Protein

Mineral salts

Sugar

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