Biology Test 286

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Biology Test 286

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Weekly Quiz Competition

Question 1
4 / -1

What did Jan Ingenhousz's experiments reveal about the role of sunlight in plant processes?

A
Sunlight is not essential for plant processes.

B
Sunlight is essential for the release of oxygen by plants.

C
Sunlight is essential for purifying the air.

D
Sunlight helps plants produce carbon dioxide.

Solution

Jan Ingenhousz's experiments with an aquatic plant showed that in bright sunlight, small bubbles containing oxygen were formed around the green parts of the plant, while in the dark, they did not. This demonstrated that sunlight is essential for the process by which plants release oxygen.
Question 2
4 / -1

Calvin cycle is discovered by:

A
Melvin Calvin

B
Blackmann

C
Cornelius van neil

D
Hatch and Slack

Solution

The work of Melvin Calvin is the discovery that the first CO₂ fixation product was a 3-carbon organic acid. He also contributed to working out the complete biosynthetic pathway; hence it was called the Calvin cycle.
Question 3
4 / -1

Electrons from exited chlorophyll molecules of photosystem II are accepted first by:

A
Cytochrome b

B
Quinone

C
Ferredoxin

D
Cytochrome F

Solution

Electrons from excited chlorphyll molecule of photosystem II are accepted first by Quinone.

Photosystem II is a photosynthetic pigment system along with some electron carriers that is located in the appressed part of the grana thylakoids.

Photosystem II has chlorophyll a, b and carotenoids. Other components of PS II are phaeophytin, plastoquinone (PQ), cytochrome complex and blue coloured copper-containing plastocyanin.
Question 4
4 / -1

In sugarcane, CO₂ is fixed in malic acid with the help of enzyme:

A
Ribulose phosphate kinase

B
RuBP carboxylase

C
Fructose phosphatase

D
PEP carboxylase

Solution

In C₄ plants, Carbon dioxide is fixed in malic acid with the help of enzyme phosphoenel pyruvate (PEP). Malic acid is a four-carbon compound that later changes into oxaloacetic acid.
Question 5
4 / -1

Dark fixation of CO₂ in CAM plants is called ossification because it produces:

A
Tartaric acid

B
Oxaloacetic acid

C
Malic acid

D
Formic acid

Solution

Dark reaction of Carbon dioxide fixation in CAM plants is called as ossification because it produces Malic acid. These plants open their stomata during night to prevent transpiration.
Question 6
4 / -1

The renal tubule which is stimulated by ADH hormone is

A
Distal convoluted tubule

B
Proximal convoluted tubule

C
Ascending loop of Henle

D
Descending loop of Henle

Solution

The renal tubule which is stimulated by ADH hormone is distal convoluted tubule. ADH increases permeability of water in DCT.
Question 7
4 / -1

Glomerular membrane has three layers. Which of the following layers has/have cells which are of peculiar shape and are called podocytes (foot cells)?

a. The endothelium

b. The epithelium

c. The basement membrane

A
Only a

B
Only b

C
Only c

D
Only a and c

Solution

The epithelium has cells which are of peculiar shape and are called podocytes (foot cells). The podocytes are so called because they possess foot-like processes, the pedicels.
Question 8
4 / -1

In nephron, the maximum reabsorption takes place in

A
Thick ascending Loop of Henle

B
Distal convoluted tubule

C
Proximal convoluted tubule (PCT)

D
Collecting ducts

Solution

Maximum reabsorption in nephron takes place in Proximal convoluted tubule cells. About two third salt and water, 100% organic solutes, 65% potassium, 50% urea , approx 80% phosphate and approx 70-90% citrate is reabsorbed in PCT.
Question 9
4 / -1

What can affect the kidney function by its constrictory effects on blood vessels?

A
ANF

B
Vasopressin

C
Antidiuretic Hormone

D
Renin

Solution

An increase in body fluid volume can switch off the osmoreceptors and suppress the ADH release to complete the feedback. ADH can also affect the kidney function by its constrictory effects on blood vessels. This causes an increase in blood pressure.
Question 10
4 / -1

When concentrated urine is produced then osmolarity of blood

A
Initially decreases and then increases

B
Remains unaltered

C
Increases

D
Decreases

Solution

Overall the osmolarity of the blood decreases when concentrated urine is being produced as water not salt is being reabsorbed in the distal tubules which reside in the cortex.

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Re-Attempt Weekly Quiz Competition

Biology Test 286

Result

Biology Test 286

Score

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Rank

-

SHARING IS CARING

Question 1

Sunlight is not essential for plant processes.

Sunlight is essential for the release of oxygen by plants.

Sunlight is essential for purifying the air.

Sunlight helps plants produce carbon dioxide.

Solution

Question 2

Melvin Calvin

Blackmann

Cornelius van neil

Hatch and Slack

Solution

Question 3

Cytochrome b

Quinone

Ferredoxin

Cytochrome F

Solution

Question 4

Ribulose phosphate kinase

RuBP carboxylase

Fructose phosphatase

PEP carboxylase

Solution

Question 5

Tartaric acid

Oxaloacetic acid

Malic acid

Formic acid

Solution

Question 6

Distal convoluted tubule

Proximal convoluted tubule

Ascending loop of Henle

Descending loop of Henle

Solution

Question 7

Only a

Only b

Only c

Only a and c

Solution

Question 8

Thick ascending Loop of Henle

Distal convoluted tubule

Proximal convoluted tubule (PCT)

Collecting ducts

Solution

Question 9

ANF

Vasopressin

Antidiuretic Hormone

Renin

Solution

Question 10

Initially decreases and then increases

Remains unaltered

Increases

Decreases

Solution

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