Biology Test 320

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Biology Test 320

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Weekly Quiz Competition

Question 1
4 / -1

Which one of the following equations suggests that O₂ released during photosynthesis comes from water?

A
6CO₂¹⁸+12H₂O→6O₂¹⁸+C₆H₁₂O₆+6H₂O¹⁸

B
6CO₂+12H₂O¹⁸→6O₂+C₆H₁₂O₆+6H₂O¹⁸

C
6CO₂¹⁸+12H₂O→6O₂¹⁸+C₆H₁₂O₆+6H²O

D
6CO₂+12H₂O¹⁸→6O₂¹⁸+C₆H₁₂O₆+6H₂O

Solution
Question 2
4 / -1

During photochemical reactions of photosynthesis,

A
assimilation of CO₂ takes place

B
liberation of O₂ and formation of NADPH₂ take place

C
formation of ATP and NADPH₂ takes place

D
liberation of O₂ and formation of ATP and NADPH₂ takes place

Solution

Light reactions or the 'photochemical' phase include light absorption, water splitting, and oxygen release. The splitting of water is associated with the PS II - water is split into H⁺, [O] and electrons. This creates oxygen, one of the net products of photosynthesis and the formation of high-energy chemical intermediates, ATP and NADPH₂. The light reactions capture energy from sunlight, which they change to chemical energy that is stored in molecules of NADPH₂ and ATP.
Question 3
4 / -1

Which of the below statements is/are not correct regarding chlorophyll a molecule?

(i) Molecule formula of chl a is C₅₅H₇₂O₅N₄Mg

(ii) It is the primary photosynthetic pigment.

(iii) In the pure state, it is red in colour and thus it absorbs more blue wavelength of light than the red wavelength.

(iv) It is a soluble in water as well as petroleum ether.

A
(i) and (iii)

B
(iii) and (iv)

C
(ii) only

D
(iv) only

Solution

Chlorophyll a is the primary photosynthetic pigment, which is bluish green in the pure state. It has an empirical formula C₅₅H₇₂O₅N₄ Mgand molecular weight of 893. It absorbs more red wavelength of light than violet blue . It is soluble in a number of organic solvents such as petroleum ether.
Question 4
4 / -1

Directions For Questions

Given graph represents the absorption spectra of three photosynthetic pigments, chl a chl b and β-carotene.

...view full instructions

Select the correct statement regarding this.

A
The curve showing the amount of absorption of different wavelengths of light by a photosynthetic pigment is called the absorption spectrum

B
Chl a and chl b absorb maximum light in the blue and red wavelengths of light

C
Rate of photosynthesis is maximum in blue and red wavelengths of light

D
All of these

Solution

The graphical curve showing the amount of energy of different wavelengths of light absorbed by a pgment is called absorption spectrum,. It is studies with the help of spectrophotometer. The absorption spectra of chorophylls a and b show that they absorb maximum light in the blue-violet and red wavelengths. The pgments are often known after the wvelength which is absorbed to the maximum e.g., chl a₆₇₃ Chl a₆₈₃(P₆₈₀), Chl a₇₀₃(P₇₀₀).
Question 5
4 / -1

Accessory photosynthetic pigments in most green plants are

A
Chlorophyll a

B
Chlorophyll b

C
Carotenoids and xanthophylls

D
Both (b) and (c)

Solution

Chlorophyll a is found in almost all photosynthetic plants except bacteria. It is called primary photosynthetic pigment because it performs primary reactions of photosynthesis which involve conversion of light energy into chemical energy. Other photosynthetic pigments like chlorophyll b, xanthophylls and carotenes are called accessory pigments. They absorb light energy of different wavelengths, broaden the spectrum of light absorption and hand over the energy to chlorophyll a through electron spin resonance and also protect chlorophyll a from photo-oxidation.
Question 6
4 / -1

Chlorophyll in a leaf is required for

A
trapping light energy

B
emitting green energy

C
breaking down water into hydrogen and oxygen

D
storing starch in the leaves

Solution

Chlorophyll present in chloroplasts traps solar energy.
Question 7
4 / -1

Diploblastic and triplo blastic are terms that describe

A
the number of in vaginations during embryonic development

B
the number of heads during embryonic development

C
the number of germinal layers during embryonic development

D
the number of cell types during development

Solution

(i) Diploblastic animals have two germinal layers (ectoderm and endoderm) during embryonic development

Example: Poriferans.

(ii) Triploblastic animals have three germinal layers (ectoderm, mesoderm and endoderm) during embryonic development

Example: Platyhelminthes.
Question 8
4 / -1

Select the correct matching of animals, their symmetry, organisation and coelom type.

A
a

B
b

C
c

D
d

Solution

Platyhelminthes are triploblastic, acoelomate organism showing bilateral symmetry. Ctenophores have borads symmetry, are acoelomates having diploblastic organisation. In echinoderms, larvae have bilateral symmetry whiled add have radial symmetry. They are coelomates with triplobla organisation. Annelids are triploblastic, coelomaterorganism showing bilateral symmetry.
Question 9
4 / -1

Which occurs during the light reaction of photosynthesis

A
Chlorophyll is produced

B
Water splits to form 2H+ & O₂

C
CO₂ is given off as a waste

D
Sugar is formed from CO₂ and water

Solution

The chlorophyll pigments which are excited give up their electrons and to compensate for the loss of electrons, water is split to release four H⁺ ions and four electrons and O². The electrons that are lost from the PSII enter into an electron transfer chain or ETC.
Question 10
4 / -1

A
a

B
b

C
c

D
d

Solution

(A) Cellular level

(B) Radial symmetry

(C) Bilateral symmetry

(D) Pseudocoelomates

(E) Coelomates

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Biology Test 320

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Question 1

6CO218​+12H2​O→6O218​+C6​H12​O6​+6H2​O18

6CO2​+12H2​O18→6O2​+C6​H12​O6​+6H2​O18

6CO218​+12H2​O→6O218​+C6​H12​O6​+6H2​O

6CO2​+12H2​O18→6O218​+C6​H12​O6​+6H2​O

Solution

Question 2

assimilation of CO2 takes place

liberation of O2 and formation of NADPH2 take place

formation of ATP and NADPH2 takes place

liberation of O2 and formation of ATP and NADPH2 takes place

Solution

Question 3

(i) and (iii)

(iii) and (iv)

(ii) only

(iv) only

Solution

Question 4

The curve showing the amount of absorption of different wavelengths of light by a photosynthetic pigment is called the absorption spectrum

Chl a and chl b absorb maximum light in the blue and red wavelengths of light

Rate of photosynthesis is maximum in blue and red wavelengths of light

All of these

Solution

Question 5

Chlorophyll a

Chlorophyll b

Carotenoids and xanthophylls

Both (b) and (c)

Solution

Question 6

trapping light energy

emitting green energy

breaking down water into hydrogen and oxygen

storing starch in the leaves

Solution

Question 7

the number of in vaginations during embryonic development

the number of heads during embryonic development

the number of germinal layers during embryonic development

the number of cell types during development

Solution

Question 8

a

b

c

d

Solution

Question 9

Chlorophyll is produced

Water splits to form 2H+ & O2

CO2 is given off as a waste

Sugar is formed from CO2 and water

Solution

Question 10

a

b

c

d

Solution

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6CO₂¹⁸+12H₂O→6O₂¹⁸+C₆H₁₂O₆+6H₂O¹⁸

6CO₂+12H₂O¹⁸→6O₂+C₆H₁₂O₆+6H₂O¹⁸

6CO₂¹⁸+12H₂O→6O₂¹⁸+C₆H₁₂O₆+6H²O

6CO₂+12H₂O¹⁸→6O₂¹⁸+C₆H₁₂O₆+6H₂O

assimilation of CO₂ takes place

liberation of O₂ and formation of NADPH₂ take place

formation of ATP and NADPH₂ takes place

liberation of O₂ and formation of ATP and NADPH₂ takes place

Water splits to form 2H+ & O₂

CO₂ is given off as a waste

Sugar is formed from CO₂ and water