SPSC Biology MCQs

PPSC Lecturer Biology Test 82 Online Preparation MCQs

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There will be 25 multiple choice question in the test.
Answer of the questions will change randomly each time you start this 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

Which organs take part in the process of transpiration ?

Only stem

Only leaves

Stem and leaves

Roots

2 / 25

Transpiration is reduced under which circumstances ?

In humid soil

When it is airy/windy

In humid atmosphere

In dry atmosphere

3 / 25

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

None of these

Tonoplast (vacuolar membrane)

Cytoplasmic membrane

Both of these

4 / 25

Water absorption in roots takes place by which process ?

Active and passive

Passive

Active absorption

Active

5 / 25

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

Very less

Less

No water

6 / 25

Sink means:

Place where food is stored

Place where food is synthesized and stored

None of these

Place where food is required

7 / 25

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

Capillary action

Cohesive force

All the above

Surface tension

8 / 25

Which of the following shows the least water potential ?

Cells of cortex

Leaf cells

Stem cells

Root cells

9 / 25

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

Gaseous form

All of these

None of these

Liquid form

10 / 25

The mineral nutrients reach the leaves through which path ?

Apoplast path

Phloem

Symplast pathway

Transpiration path

11 / 25

Through which pathway is the least water transported ?

Symplastic pathway

Apoplastic pathway

Vacuolar path

All of the above

12 / 25

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

Lipids

Sugar

Mineral salts

Protein

13 / 25

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

Gets closed

Becomes very narrow

Becomes broader

Becomes narrow

14 / 25

The stomata closes under which circumstances ?

When water enters guard cells

When the turgidity of guard cells decreases

When guard cells loose turgidity

When water collects in guard cells

15 / 25

Why can’t the mineral nutrients be absorbed passively ?

None of the above

They can pass from the plasma membrane

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

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

16 / 25

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

Triangular

Elliptical

Semicircular

Crescent shaped

17 / 25

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

Ventral surface of leaf

In leaf stalk

Leaf margin

Dorsal surface of leaf

18 / 25

In monocots, which cells are associated with the stomata:

Epidermal cells and guard cells

Epidermal cells and accessory cells

Guard cells and accessory cells

Only guard cells

19 / 25

Source means:

Where food is stored

Place where food is digested

Where food is accepted

Where food is synthesized

20 / 25

Ascent of sap is the result of:

Diffusion

Root pressure

None of the above

Turgor pressure

21 / 25

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

All of the above

Vacuolar path

Apoplastic pathway

Symplastic pathway

22 / 25

Ascent of sap means:

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 water and salts towards the root system and stem

Transport of food prepared in leaves towards the buds

23 / 25

Which cells in the roots behave as regulators?

Pericycle

Endodermis

Cortex

Epidermis

24 / 25

The force present amongst water molecules is

Gravitational force

Cohesive force

Friction force

Adhesive force

25 / 25

What is correct about ascent of sap?

Utilizes energy

None of these

Both of these

Against the gravitational force

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