Algal Pigments: MCQs for a Colorful Learning Experience
1. What are the four main types of pigments found in algae?
A) Red, Blue, Green, and Yellow
B) Chlorophylls, Xanthophylls, Carotenes, and Phycobilins
C) Anthocyanins, Flavonoids, Tannins, and Melanins
D) Hemoglobin, Myoglobin, Cytochromes, and Chloroplasts
Answer: B) Chlorophylls, Xanthophylls, Carotenes, and Phycobilins
Explanation: The passage mentions that chlorophylls, xanthophylls, carotenes, and phycobilins are the four main types of pigments found in algae.
2. Which division of algae lacks traditional plastids, and where are the pigments located instead?
A) Chlorophyta
B) Cyanophyta
C) Phaeophyta
D) Rhodophyta
Answer: B) Cyanophyta
Explanation: The passage states that the Cyanophyta division lacks traditional plastids, and the pigments are located in the lamellae.
3. Which chlorophyll variant is exclusively found in red algae?
A) Chlorophyll-a
B) Chlorophyll-b
C) Chlorophyll-c
D) Chlorophyll-d
Answer: D) Chlorophyll-d
Explanation: According to the passage, red algae exclusively boast chlorophyll-D.
4. What is the function of chlorophyll in photosynthesis?
A) Absorb blue and red rays
B) Absorb green and yellow rays
C) Absorb ultraviolet rays
D) Reflect all colors
Answer: A) Absorb blue and red rays.
Explanation: The passage mentions that chlorophylls absorb blue and red rays, playing a pivotal role in photosynthesis.
5. Which category of pigments includes carotenes and xanthophylls?
A) Phycobilins
B) Chlorophylls
C) Carotenoids
D) Anthocyanins
Answer: C) Carotenoids
Explanation: The passage states that carotenoids include carotenes and xanthophylls.
6. What is the chemical formula of carotenes, a type of carotenoid pigment?
A) C40H56O2
B) C55H72O5N4Mg
C) C40H56
D) C55H72O5
Answer: C40H56
Explanation: According to the passage, carotenes are linear unsaturated hydrocarbons with the chemical formula C40H56.
7. Which xanthophyll is mentioned as a distinctive pigment in Phaeophyta, imparting a brown or olive hue to thalli?
A) Zeaxanthin
B) Astaxanthin
C) Diatoxanthin
D) Fucoxanthin
Answer: D) Fucoxanthin
Explanation: The passage mentions fucoxanthin as a distinctive pigment in phaeophyta, imparting a brown or olive hue to thalli.
8. What is the role of phycobilins in photosynthesis?
A) Absorb blue and red rays
B) Absorb green light
C) Absorb ultraviolet rays
D) Reflect all colors
Answer: B) absorb green light.
Explanation: The passage states that phycobilins like r-phycocyanin absorb green light in photosynthesis.
9. How do chloroplasts differ from chromatophores?
A) Chloroplasts lack chlorophyll a.
B) Chloroplasts lack carotenoids.
C) Chromatophores lack chlorophyll-b
D) Chromatophores are water-soluble.
Answer: C) Chromatophores lack chlorophyll-b.
Explanation: The passage mentions that chromatophores lack chlorophyll-B and are rich in carotenoids.
10. In which algae division are cup-shaped plastids, exemplified by Chlamydomonas spp., found?
A) Rhodophyta
B) Chlorophyta
C) Phaeophyta
D) Cyanophyta
Answer: B) Chlorophyta
Explanation: The passage states that cup-shaped plastids, exemplified by Chlamydomonas spp., are found in certain algae, including those in the Chlorophyta division. **
1. What is the main factor contributing to the diverse colors of algae?
A) Size of the algae
B) Presence of plastids
C) Environmental temperature
D) Water salinity
Answer: B) Presence of plastids
Explanation: The diverse colors of algae are attributed to the presence of various pigments within plastids.
2. Which of the following is not a type of algal pigment?
A) Chlorophylls
B) Carotenoids
C) Anthocyanins
D) Phycobilins
Answer: C) Anthocyanins
Explanation: Anthocyanins are not mentioned as algal pigments in the provided information.
3. In which division of algae are chlorophyll-d and Chlorophyll-e exclusively found?
A) Chlorophyta
B) Rhodophyta
C) Xanthophyta
D) Phaeophyta
Answer: B) Rhodophyta
Explanation: According to the passage, chlorophyll-d is exclusively found in red algae (Rhodophyta), and chlorophyll-e is found in Xanthophyta.
4. What is the function of carotenes, a type of carotenoid pigment?
A) Absorb blue and red rays
B) Absorb green light
C) Absorb ultraviolet rays
D) Reflect all colors
Answer: D) Reflect all colors.
Explanation: The passage does not specify the function of carotenes, but carotenoids, in general, absorb blue and green light waves.
5. Which division of algae is known for having fucoxanthin as a distinctive pigment?
A) Chlorophyta
B) Rhodophyta
C) Xanthophyta
D) Phaeophyta
Answer: (D) Phaeophyta
Explanation: Fucoxanthin is mentioned as a distinctive pigment in phaeophyta, imparting a brown or olive hue.
6. Where are algal pigments typically housed within the cells?
A) Nucleus
B) Plastids
C) Golgi apparatus
D) Mitochondria
Answer: B) Plastids
Explanation: Algal pigments are typically housed within plastids, which come in various forms and shapes.
7. Which type of plastid is concave and resembles a cup?
A) Cup-shaped Plastids
B) Lens-shaped Plastids
C) Disc or Network-like Plastids
D) Oval-shaped Plastids
Answer: (A) Cup-shaped Plastids
Explanation: Cup-shaped plastids are found in certain algae, such as Chlamydomonas spp.
8. In which algae division are star-shaped (stellate) plastids exhibited?
A) Chlorophyta
B) Rhodophyta
C) Xanthophyta
D) Zygnema spp.
Answer: D) Zygnema spp.
Explanation: Star-shaped plastids are mentioned as exhibited by Zygnema spp.
9. What is the role of phycobilins in photosynthesis?
A) Absorb blue and red rays
B) Absorb green light
C) Absorb ultraviolet rays
D) Reflect all colors
Answer: B) Absorb green light.
Explanation: Phycobilins, such as r-phycocyanin, absorb green light in photosynthesis.
10. What distinguishes chromatophores from chloroplasts?
A) Chromatophores are water-soluble.
B) Chloroplasts lack chlorophyll-b
C) Chromatophores lack carotenoids.
D) Chloroplasts are found in red algae.
Answer: B) Chloroplasts lack chlorophyll.
Explanation: The passage mentions that chromatophores lack chlorophyll-B and are rich in carotenoids.
11. Which of the following algae divisions lacks traditional plastids?
A) Chlorophyta
B) Rhodophyta
C) Cyanophyta
D) Xanthophyta
Answer: C) Cyanophyta
Explanation: The passage mentions that Cyanophyta lacks traditional plastids.
12. What is the specific role of xanthophylls in photosynthesis?
A) Absorb blue and red rays
B) Absorb green light
C) Absorb ultraviolet rays
D) Reflect all colors
Answer: B) Absorb green light
Explanation: Xanthophylls are mentioned to be part of carotenoids that absorb green light.
13. Which plastid type is lobed and disc-shaped?
A) Disc or Network-like Plastids
B) Lobed Disc Plastids
C) Star-shaped (stellate) Plastids
D) Oval-shaped Plastids
Answer: B) Lobed Disc Plastids
Explanation: Lobed Disc Plastids are described as plastids that are lobed and disc-shaped.
14. In which algae division are parietal plate plastids found?
A) Ulva spp.
B) Ectocarpus spp.
C) Porphyra spp.
D) Spirogyra spp.
Answer: A) Ulva spp.
Explanation: Parietal plate plastids are found in certain algae, including Ulva spp.
15. Which chlorophyll variant is prevalent in Chlorophyta, Euglenophyta, and Charophyta?
A) Chlorophyll-a
B) Chlorophyll-b
C) Chlorophyll-c
D) Chlorophyll-d
Answer: A) Chlorophyll-a
Explanation: Chlorophyll-a is prevalent in Chlorophyta, Euglenophyta, and Charophyta according to the passage.
16. What is the chemical formula of Chlorophyll-a?
A) C40H56O2
B) C55H72O5N4Mg
C) C40H56
D) C55H72O5
Answer: B) C55H72O5N4Mg
Explanation: The passage provides the chemical formula for Chlorophyll-a as C55H72O5N4Mg.
17. Which category of pigments includes compounds linked to globulin proteins?
A) Chlorophylls
B) Carotenoids
C) Phycobilins
D) Xanthophylls
Answer: C) Phycobilins
Explanation: Phycobilins are pigments composed of tetrapyrrolic compounds linked to globulin proteins.
18. What is the distinctive color imparted by Fucoxanthin in Phaeophyta?
A) Blue
B) Brown
C) Green
D) Red
Answer: B) Brown
Explanation: Fucoxanthin imparts a brown or olive hue to thalli in Phaeophyta.
19. In which plastid type are plastids arranged in a band along the axis of the cell?
A) Axial Band Plastids
B) Cup-shaped Plastids
C) Star-shaped (stellate) Plastids
D) Parietal Ring Plastids
Answer: A) Axial Band Plastids
Explanation: Axial Band Plastids are plastids arranged in a band along the axis of the cell.
20. What is the primary role of chlorophylls in photosynthesis?
A) Absorb blue and red rays
B) Absorb green light
C) Absorb ultraviolet rays
D) Reflect all colors
Answer: A) Absorb blue and red rays
Explanation: Chlorophylls play a pivotal role in photosynthesis by absorbing blue and red rays.
21. Which algal division exhibits disc or network-like plastids?
A) Chlorophyta
B) Rhodophyta
C) Xanthophyta
D) Oedogonium spp.
Answer: D) Oedogonium spp.
Explanation: Disc or Network-like Plastids are mentioned as found in Oedogonium spp.
22. What role do carotenoids play in the photosynthetic process?
A) Absorb blue and red rays
B) Absorb green light
C) Absorb ultraviolet rays
D) Reflect all colors
Answer: A) Absorb blue and green light waves
Explanation: The passage states that carotenoids absorb blue and green light waves.
23. Which type of plastid is oval or elliptical in shape?
A) Disc or Network-like Plastids
B) Oval-shaped Plastids
C) Star-shaped (stellate) Plastids
D) Parietal Ring Plastids
Answer: B) Oval-shaped Plastids
Explanation: Oval-shaped plastids have an oval or elliptical shape according to the passage.
24. What is the unique configuration of star-shaped (stellate) plastids?
A) Circular
B) Linear
C) Triangular
D) Star-like
Answer: D) Star-like
Explanation: Star-shaped (stellate) plastids exhibit a star-like configuration.
25. Which algal division features parietal ring plastids?
A) Chlorophyta
B) Rhodophyta
C) Xanthophyta
D) Porphyra spp.
Answer: D) Porphyra spp.
Explanation: Parietal Ring Plastids are mentioned as forming a ring-like structure in Porphyra spp.
26. What is the distribution pattern of chlorophyll-c among algal divisions?
A) Chlorophyta, Euglenophyta, Charophyta
B) Bacillariophyta, Pyrrophyta, Phaeophyta
C) Rhodophyta, Xanthophyta
D) Cyanophyta
Answer: B) Bacillariophyta, Pyrrophyta, Phaeophyta
Explanation: Chlorophyll-c is mentioned as appearing in Bacillariophyta, Pyrrophyta, and Phaeophyta.
27. In which algae division are parietal plate plastids found?
A) Ulva spp.
B) Ectocarpus spp.
C) Porphyra spp.
D) Spirogyra spp.
Answer: A) Ulva spp.
Explanation: Parietal Plate Plastids are mentioned as found in Ulva spp.
28. What is the primary function of phycocyanin in photosynthesis?
A) Absorb blue and red rays
B) Absorb green light
C) Absorb ultraviolet rays
D) Reflect all colors
Answer: B) Absorb green light
Explanation: Phycocyanin is mentioned to absorb green light in photosynthesis.
29. Which algae division exclusively features Chlorophyll-d?
A) Chlorophyta
B) Rhodophyta
C) Xanthophyta
D) Cyanophyta
Answer: B) Rhodophyta
Explanation: Chlorophyll-d is exclusively found in red algae (Rhodophyta).
30. What is the chemical formula of Chlorophyll-b?
A) C40H56O2
B) C55H72O5N4Mg
C) C40H56
D) C55H72O5
Answer: Not provided in the passage.
Explanation: The passage does not provide the specific chemical formula for Chlorophyll-b.
31. What is the primary role of chlorophyll-b in photosynthesis?
A) Absorb blue and red rays
B) Absorb green light
C) Absorb ultraviolet rays
D) Reflect all colors
Answer: Not provided in the passage.
Explanation: The passage does not provide specific information about the primary role of chlorophyll-b in photosynthesis.
32. In which plastid type are plastids arranged in a network-like structure?
A) Disc or Network-like Plastids
B) Lobed Disc Plastids
C) Star-shaped (stellate) Plastids
D) Oval-shaped Plastids
Answer: A) Disc or Network-like Plastids
Explanation: Disc or Network-like Plastids are mentioned as having a flat, disc-shaped appearance or forming a network.
33. What is the primary function of Xanthophyta in photosynthesis?
A) Absorb blue and red rays
B) Absorb green light
C) Absorb ultraviolet rays
D) Reflect all colors
Answer: Not provided in the passage.
Explanation: The passage does not provide specific information about the primary function of Xanthophyta in photosynthesis.
34. Which division of algae exclusively features Chlorophyll-e?
A) Chlorophyta
B) Rhodophyta
C) Xanthophyta
D) Cyanophyta
Answer: C) Xanthophyta
Explanation: Chlorophyll-e is mentioned as featuring in Xanthophyta.
35. Which of the following pigments is water-soluble and prevalent in red and blue-green algae?
A) Carotenoids
B) Chlorophylls
C) Phycobilins
D) Xanthophylls
Answer: C) Phycobilins
Explanation: Phycobilins are water-soluble and prevalent in red and blue-green algae.
36. What is the primary role of r-phycoerythrin in photosynthesis?
A) Absorb blue and red rays
B) Absorb green light
C) Absorb ultraviolet rays
D) Reflect all colors
Answer: A) Absorb blue and red rays
Explanation: r-phycoerythrin is mentioned as absorbing blue, green, and sometimes yellow rays in photosynthesis.
37. In which algal division are cup-shaped plastids found, exemplified by Chlamydomonas spp.?
A) Chlorophyta
B) Rhodophyta
C) Xanthophyta
D) Cyanophyta
Answer: A) Chlorophyta
Explanation: Cup-shaped plastids are found in certain algae, including Chlamydomonas spp., which belongs to Chlorophyta.
38. What is the primary role of chlorophyll-c in photosynthesis?
A) Absorb blue and red rays
B) Absorb green light
C) Absorb ultraviolet rays
D) Reflect all colors
Answer: Not provided in the passage.
Explanation: The passage does not provide specific information about the primary role of chlorophyll-c in photosynthesis.
39. Which type of plastid is attached to the cell wall in the form of a plate?
A) Cup-shaped Plastids
B) Parietal Plate Plastids
C) Lens-shaped Plastids
D) Axial Band Plastids
Answer: B) Parietal Plate Plastids
Explanation: Parietal Plate Plastids are described as plastids in the form of a plate attached to the cell wall.
40. What is the coloration pattern contributed by lens-shaped plastids?
A) Blue
B) Green
C) Red
D) Specific coloration patterns not provided in the passage.
Answer: D) Specific coloration patterns not provided in the passage.
Explanation: The passage does not provide specific information about the coloration patterns contributed by lens-shaped plastids.
.png)
2 Comments
Saba younas
ReplyDelete1237
Umme kalsoom
ReplyDelete1238