Light Absorbing Pigments

Q. Accessory thylakoid pigments like chlorophyll b, xanthophylls and carotenoids play an important role in

1. protecting chlorophyll a from photo-oxidation
2. absorbing some amount of light and transfer the energy to chlorophyll a
3. all of the above
4. enabling the chloroplast in utilizing a wider range of wavelengths of incoming light

Q. __________ forms the reaction centre during light reaction of photosynthesis.

1. Xanthophyll
2. Chlorophyll a
3. Carotene
4. Chlorophyll b

Q.

Suppose there were plants that had a high concentration of Chlorophyll b but lacked chlorophyll a, would it carry out photosynthesis? Then why do plants have chlorophyll b and other accessory pigments?

Q.

Can ${\mathrm{CH}}_3\mathrm{OH}$ act as a nucleophile?

Q.

The following statements regarding ‘lipids’ are given. Which of these are the correct statements.

1. Lipids only have single bonds and such lipids are called unsaturated fatty acids.

2. Palmitic acid has twenty carbons excluding the carboxyl group.

3. Lecithin is a phospholipid.

4. Trihydroxy propane is glycerol.

Q.

Question 29
Chlorophyll-'a' is the primary pigment for the light reaction. What are accessory pigments? What is their role in photosynthesis?

Q. Which property of the phytol tail of chlorophyll molecule allows it to anchor it to the thylakoid membranes?

1. Being hydrophilic in nature
2. Having Mg as the metal ion
3. None of the above
4. Being hydrophobic in nature

Q.

Question 02
Which pigment acts directly to convert light energy to chemical energy?
(a) Chlorophyll-a (b) Chlorophyll-b
(c) Xanthophyll (d) Carotenoid

Q. Match the following:

(a)	Aquaporin	(i)	Amide
(b)	Asparagine	(ii)	Polysaccharide
(c)	Abscisic acid	(iii)	Polypeptide
(d)	Chitin	(iv)	Carotenoids

Select the correct option:

1. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
2. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
3. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
4. (a)-(iii), (b)-(i), (c) -(ii), (d)-(iv)

Q. In the process of photosynthesis, light energy is absorbed by

1. RuBP
2. $C{O}_2$
3. chlorophyll
4. oxygen molecule

Q.

Difference between peptones, proteoses, and peptides.

Q.

The fluid-filled space in chloroplasts is called ______.

1. thylakoid
2. stroma
3. matrix
4. cristae

Q.

Do all parts of plant carry out photosynthesis?

Q. Which of the following is the primary photosynthetic pigment?

1. ChlorophyII-a
2. Chlorophyll-b
3. Carotene
4. Xanthophyll.

Q.

When oxygen is released as a result of photosynthesis, it is a by-product of which of the following?

1. reducing NADP+

2. splitting the water molecules

3. the electron transfer system of photosystem I

4. chemiosmosis

Q.

______ is needed for the synthesis of auxins.

1. Zinc

2. Molybdenum

3. Copper

4. Potassium

Q.

Well-defined nucleus is absent in

1. Blue-green algae

2. Diatoms

3. Algae

4. Yeast

Q.

Solarisation is the

1. Destruction of chlorophyll

2. Formation of chlorophyll

3. Utilization of sunlight

4. Effect of solar light

Q. The structure of chlorophyll has

1. a tadpole-like structure
2. a porphyrin head
3. a phytol tail
4. all of the above

Q. Read the assertion and reason carefully to mark the correct option in question.

Assertion: Chlorophyll a is the chief pigment associated with photosynthesis.

Reason: In the blue and red regions of spectrum, there is maximum absorption by chlorophyll a, also shows higher rate of photosynthesis.

1. If assertion is true but the reason is false.
2. f both assertion and reason are false.
3. If both assertion and reason are true but the reason is not the correct explanation of the assertion.
4. If both assertion and reason are true and the reason is the correct explanation of the assertion.

Q.

Is chlorine a macronutrient or micronutrient?

Q. Which one of the following pigments does not occur in the chloroplast?

1. Carotene
2. Xanthophyll
3. Anthocyanin
4. Chlorophyll 'b'

Q.

How many cells do archaebacteria have?

Q. The porphyrin head of chlorophyll has ___________ atom at its centre.

1. sodium atom
2. magnesium atom
3. calcium atom
4. potassium atom

Q. In higher plants, chlorophyll is present in

1. inner and outer membrane
2. stroma
3. thylakoids
4. the intermembrane space of chloroplast

Q. Which of the following is not a limiting factor A. CO2 concentration B.light intensity C.temperature D.water

Q. First reaction in photosynthesis:
a. Photolysis of water
b. Excitation of chlorophyll molecules

Q.

Photooxidation of chlorophyll is called as_______.

1. Chlorosis

2. Solarization

3. Defoliation

4. Intensification

Q.

Is xanthophyll an accessory pigment?

Q. Which of the following statements about thylakoids is not correct?

1. The thylakoid membranes contain the chlorophyll pigments
2. The thylakoid membranes contain the photosystems
3. The thylakoid membranes contain the Calvin cycle enzymes
4. The thylakoid membranes contain the electron transport machinery