Biology Test 255

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Biology Test 255

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Weekly Quiz Competition

Question 1
4 / -1

The actual pressure that develops in a solution, when it is separated from pure water by means of semipermeable membrane is

A
root pressure

B
stem pressure

C
osmotic pressure

D
wall pressure

Solution

The actual pressure that develops in a solution, when it is separated from pure water by means of semipermeable membrane is osmotic pressure.
Question 2
4 / -1

The objections to starch-sugar interconversion theory of stomatal movement is/are

A
glucose is not found in guard cells at the time of stomatal opening

B
change in pH cannot be explained on the basis of CO₂ concentration

C
starch-sugar changes are chemically slow, while opening and closing of stomata are rapid

D
All of the above

Solution

All the given objections are true for starch-sugar interconversion theory of stomatal movement.
Question 3
4 / -1

Identify the correctly matched pair.

A
Apoplast pathway— Water moves exclusively through the cell wall

B
Transmembrane pathway— Water crosses at least one membrane

C
Symplast pathway— Water moves from one cell to the next via plasmodesmata

D
All of the above

Solution

In apoplast pathway, water passes from root hair to xylem through the wall of intervening cells without crossing any membrane or cytoplasm. In symplast pathway, water passes from cell to cell through their protoplasm via plasmodesmata. For entering into symplast, water has to pass through cell membrane at least at one place. It is also called transmembrane pathway.
Question 4
4 / -1

The shield and accessory pigments are

A
chlorophylls

B
carotenoids

C
allophycocyanin

D
phycobilins

Solution

Carotenoids are known as shield and accessory pigments. They are a group of yellow, brown to reddish pigments
Question 5
4 / -1

The transpiration pull overcomes

A
resistance of narrow xylem channels and their end walls

B
resistance offered by water coming out of narrow capillary pores to the soil

C
root pressure

D
Both (a) and (b)

Solution

The tension developed due to transpiration is called transpiration pull. As a result, the water column of the plant is pulled up passively from below to the top of the plant like a rope. It overcomes resistance of narrow xylem channels and their end walls as well as resistance offered by water coming out of narrow capillary pores of the soil.
Question 6
4 / -1

The cyclic photophosphorylation

A
takes place in the grana of chloroplasts

B
involves cyclic movement of electrons

C
is a photochemical reaction

D
All of the above

Solution

Cyclic photophosphorylation is the process in which an electron expelled by the excited photocentre is returned to it after passing through a series of electron carriers. It is the light driven synthesis of ATP. It occurs in stroma lamellae and unstacked thylakoids.
Question 7
4 / -1

In diphyodont dentition, how many teeth are present in milk dentition?

A
12

B
20

C
28

D
32

Solution

In diphyodont dentition, 20 milk teeth are present. Milk teeth of man include 8 incisors, 4 canines and 8 molars.
Question 8
4 / -1

Castle’s Intrinsic Factor or CIF secreted by the parietal or oxyntic cells of the gastric glands helps in

A
releasing mucus for lubrication

B
absorption of monosaccharides

C
absorption of vitamin-B12

D
secreting proenzyme pepsinogen

Solution

Castle’s Intrinsic Factor (CIF) secreted by the parietal or oxyntic cells of the gastric glands helps in the absorption of vitamin-B12.
Question 9
4 / -1

Sarcomere which is the functional unit of contraction is present

A
in the centre of I-band

B
in isotropic band

C
both (a) and (b)

D
between two successive Z-lines

Solution

Sarcomere is the functional unit of contraction. It is present between two successive Z-lines.
Question 10
4 / -1

A chronic disorder in which alveolar walls are damaged thereby, decreasing the respiratory surface is

A
asthma

B
emphysema

C
tuberculosis

D
occupational respiratory disorder

Solution

Emphysema is a chronic disorder in which alveolar walls are damaged. It results in the decreased respiratory surface.

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Biology Test 255

Result

Biology Test 255

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SHARING IS CARING

Question 1

root pressure

stem pressure

osmotic pressure

wall pressure

Solution

Question 2

glucose is not found in guard cells at the time of stomatal opening

change in pH cannot be explained on the basis of CO2 concentration

starch-sugar changes are chemically slow, while opening and closing of stomata are rapid

All of the above

Solution

Question 3

Apoplast pathway— Water moves exclusively through the cell wall

Transmembrane pathway— Water crosses at least one membrane

Symplast pathway— Water moves from one cell to the next via plasmodesmata

All of the above

Solution

Question 4

chlorophylls

carotenoids

allophycocyanin

phycobilins

Solution

Question 5

resistance of narrow xylem channels and their end walls

resistance offered by water coming out of narrow capillary pores to the soil

root pressure

Both (a) and (b)

Solution

Question 6

takes place in the grana of chloroplasts

involves cyclic movement of electrons

is a photochemical reaction

All of the above

Solution

Question 7

12

20

28

32

Solution

Question 8

releasing mucus for lubrication

absorption of monosaccharides

absorption of vitamin-B12

secreting proenzyme pepsinogen

Solution

Question 9

in the centre of I-band

in isotropic band

both (a) and (b)

between two successive Z-lines

Solution

Question 10

asthma

emphysema

tuberculosis

occupational respiratory disorder

Solution

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change in pH cannot be explained on the basis of CO₂ concentration