259224
In blue-green algae, photosystem-II contains important pigment concerned with photolysis of water. It is a:
1 Phycocyanin
2 Cytochrome-c
3 Chlorophyll-b
4 $\beta$-carotene
Explanation:
In BGA (Blue Green Algae) Photo system-II contains important pigment concerned with photolysis of water. It is phycocynin or phycoerythrin. It is an pigment protein complex found in cyanobacteria.
AIIMS-2015
Plant kingdom
259225
Water blooms are formed by:
1 Planaktonic algae
2 Lemna
3 Rhizopus
4 Wolffia
Explanation:
Water blooms are formed by planktonic algae. Planktonic algae are microscopic plants that live in every drop of pond water, planktonic algae are important because they produce oxygen and food for the animals that live in the pond. It forms a layer over the surface of the water. It is promoted by the release of the inorganic and organic compounds in the water body by the agricultural field run off, industrial discharge and untreated sewage. This is called eutrophication because it builds up the substratum of the water body. It depletes the dissolved oxygen level because the decomposing bacteria get activated to breakdown the organic compounds
J and K CET-2000
Plant kingdom
259227
Which of the following algae shows physiological anisogamy?
1 Spirogyra
2 Ulothrix
3 Volvox
4 All of these
Explanation:
In spirogyra, all filamentous cells have the capacity to develop gametes, sometimes known as isogametes because of their identical morphology. This phenomena of sexual reproduction is known as isogamous type of sexual reproduction. But at the time of conjugation one of the two isogametes shows motility and is considered as male gamete. This phenomenon is referred to as physiological anisogamy.
JCECE-2002
Plant kingdom
259228
Which one set of genera are correctly matched?
1 Chlorophyceae- Volvax, Laminaria, Fucus
2 Phaeophyceae- Laminaria, Chlamydomonas
3 Rhodophyceae- Gelidium, Gracilaria
4 Phaeophyceae- Laminarea, Sargassum, Ulothrix
Explanation:
Rhodophyceae includes - Geliduim, Gracilaria, Porphyra and Polysiphonia. Where as chorophyceae includes - Chlorella, Chlomydomonas, Spirogyra, Chara, Volvox, Ulothrix, phaeophyceae includes - kelp, Sargassum, Laminaria etc.
BVP-2014
Plant kingdom
259230
In Spirogyra, a brief period of tetranucleate condition is found in-
1 hold fast
2 gametangium
3 vegetative cell
4 germinating zygote
Explanation:
Spirogyra is an examples of chlorophyceae and sexual reproduction takes place through the fusion of two morphologically identical but physiologically dissimilar non- ciliated gametes. The fusion of both kinds of gametes results into formation of zygospores. The germinating diploid zygospores undergoes meiosis to maintain the haploid condition. Thus, in the condition tetranucleate condition is found for a brief period of time.
259224
In blue-green algae, photosystem-II contains important pigment concerned with photolysis of water. It is a:
1 Phycocyanin
2 Cytochrome-c
3 Chlorophyll-b
4 $\beta$-carotene
Explanation:
In BGA (Blue Green Algae) Photo system-II contains important pigment concerned with photolysis of water. It is phycocynin or phycoerythrin. It is an pigment protein complex found in cyanobacteria.
AIIMS-2015
Plant kingdom
259225
Water blooms are formed by:
1 Planaktonic algae
2 Lemna
3 Rhizopus
4 Wolffia
Explanation:
Water blooms are formed by planktonic algae. Planktonic algae are microscopic plants that live in every drop of pond water, planktonic algae are important because they produce oxygen and food for the animals that live in the pond. It forms a layer over the surface of the water. It is promoted by the release of the inorganic and organic compounds in the water body by the agricultural field run off, industrial discharge and untreated sewage. This is called eutrophication because it builds up the substratum of the water body. It depletes the dissolved oxygen level because the decomposing bacteria get activated to breakdown the organic compounds
J and K CET-2000
Plant kingdom
259227
Which of the following algae shows physiological anisogamy?
1 Spirogyra
2 Ulothrix
3 Volvox
4 All of these
Explanation:
In spirogyra, all filamentous cells have the capacity to develop gametes, sometimes known as isogametes because of their identical morphology. This phenomena of sexual reproduction is known as isogamous type of sexual reproduction. But at the time of conjugation one of the two isogametes shows motility and is considered as male gamete. This phenomenon is referred to as physiological anisogamy.
JCECE-2002
Plant kingdom
259228
Which one set of genera are correctly matched?
1 Chlorophyceae- Volvax, Laminaria, Fucus
2 Phaeophyceae- Laminaria, Chlamydomonas
3 Rhodophyceae- Gelidium, Gracilaria
4 Phaeophyceae- Laminarea, Sargassum, Ulothrix
Explanation:
Rhodophyceae includes - Geliduim, Gracilaria, Porphyra and Polysiphonia. Where as chorophyceae includes - Chlorella, Chlomydomonas, Spirogyra, Chara, Volvox, Ulothrix, phaeophyceae includes - kelp, Sargassum, Laminaria etc.
BVP-2014
Plant kingdom
259230
In Spirogyra, a brief period of tetranucleate condition is found in-
1 hold fast
2 gametangium
3 vegetative cell
4 germinating zygote
Explanation:
Spirogyra is an examples of chlorophyceae and sexual reproduction takes place through the fusion of two morphologically identical but physiologically dissimilar non- ciliated gametes. The fusion of both kinds of gametes results into formation of zygospores. The germinating diploid zygospores undergoes meiosis to maintain the haploid condition. Thus, in the condition tetranucleate condition is found for a brief period of time.
259224
In blue-green algae, photosystem-II contains important pigment concerned with photolysis of water. It is a:
1 Phycocyanin
2 Cytochrome-c
3 Chlorophyll-b
4 $\beta$-carotene
Explanation:
In BGA (Blue Green Algae) Photo system-II contains important pigment concerned with photolysis of water. It is phycocynin or phycoerythrin. It is an pigment protein complex found in cyanobacteria.
AIIMS-2015
Plant kingdom
259225
Water blooms are formed by:
1 Planaktonic algae
2 Lemna
3 Rhizopus
4 Wolffia
Explanation:
Water blooms are formed by planktonic algae. Planktonic algae are microscopic plants that live in every drop of pond water, planktonic algae are important because they produce oxygen and food for the animals that live in the pond. It forms a layer over the surface of the water. It is promoted by the release of the inorganic and organic compounds in the water body by the agricultural field run off, industrial discharge and untreated sewage. This is called eutrophication because it builds up the substratum of the water body. It depletes the dissolved oxygen level because the decomposing bacteria get activated to breakdown the organic compounds
J and K CET-2000
Plant kingdom
259227
Which of the following algae shows physiological anisogamy?
1 Spirogyra
2 Ulothrix
3 Volvox
4 All of these
Explanation:
In spirogyra, all filamentous cells have the capacity to develop gametes, sometimes known as isogametes because of their identical morphology. This phenomena of sexual reproduction is known as isogamous type of sexual reproduction. But at the time of conjugation one of the two isogametes shows motility and is considered as male gamete. This phenomenon is referred to as physiological anisogamy.
JCECE-2002
Plant kingdom
259228
Which one set of genera are correctly matched?
1 Chlorophyceae- Volvax, Laminaria, Fucus
2 Phaeophyceae- Laminaria, Chlamydomonas
3 Rhodophyceae- Gelidium, Gracilaria
4 Phaeophyceae- Laminarea, Sargassum, Ulothrix
Explanation:
Rhodophyceae includes - Geliduim, Gracilaria, Porphyra and Polysiphonia. Where as chorophyceae includes - Chlorella, Chlomydomonas, Spirogyra, Chara, Volvox, Ulothrix, phaeophyceae includes - kelp, Sargassum, Laminaria etc.
BVP-2014
Plant kingdom
259230
In Spirogyra, a brief period of tetranucleate condition is found in-
1 hold fast
2 gametangium
3 vegetative cell
4 germinating zygote
Explanation:
Spirogyra is an examples of chlorophyceae and sexual reproduction takes place through the fusion of two morphologically identical but physiologically dissimilar non- ciliated gametes. The fusion of both kinds of gametes results into formation of zygospores. The germinating diploid zygospores undergoes meiosis to maintain the haploid condition. Thus, in the condition tetranucleate condition is found for a brief period of time.
259224
In blue-green algae, photosystem-II contains important pigment concerned with photolysis of water. It is a:
1 Phycocyanin
2 Cytochrome-c
3 Chlorophyll-b
4 $\beta$-carotene
Explanation:
In BGA (Blue Green Algae) Photo system-II contains important pigment concerned with photolysis of water. It is phycocynin or phycoerythrin. It is an pigment protein complex found in cyanobacteria.
AIIMS-2015
Plant kingdom
259225
Water blooms are formed by:
1 Planaktonic algae
2 Lemna
3 Rhizopus
4 Wolffia
Explanation:
Water blooms are formed by planktonic algae. Planktonic algae are microscopic plants that live in every drop of pond water, planktonic algae are important because they produce oxygen and food for the animals that live in the pond. It forms a layer over the surface of the water. It is promoted by the release of the inorganic and organic compounds in the water body by the agricultural field run off, industrial discharge and untreated sewage. This is called eutrophication because it builds up the substratum of the water body. It depletes the dissolved oxygen level because the decomposing bacteria get activated to breakdown the organic compounds
J and K CET-2000
Plant kingdom
259227
Which of the following algae shows physiological anisogamy?
1 Spirogyra
2 Ulothrix
3 Volvox
4 All of these
Explanation:
In spirogyra, all filamentous cells have the capacity to develop gametes, sometimes known as isogametes because of their identical morphology. This phenomena of sexual reproduction is known as isogamous type of sexual reproduction. But at the time of conjugation one of the two isogametes shows motility and is considered as male gamete. This phenomenon is referred to as physiological anisogamy.
JCECE-2002
Plant kingdom
259228
Which one set of genera are correctly matched?
1 Chlorophyceae- Volvax, Laminaria, Fucus
2 Phaeophyceae- Laminaria, Chlamydomonas
3 Rhodophyceae- Gelidium, Gracilaria
4 Phaeophyceae- Laminarea, Sargassum, Ulothrix
Explanation:
Rhodophyceae includes - Geliduim, Gracilaria, Porphyra and Polysiphonia. Where as chorophyceae includes - Chlorella, Chlomydomonas, Spirogyra, Chara, Volvox, Ulothrix, phaeophyceae includes - kelp, Sargassum, Laminaria etc.
BVP-2014
Plant kingdom
259230
In Spirogyra, a brief period of tetranucleate condition is found in-
1 hold fast
2 gametangium
3 vegetative cell
4 germinating zygote
Explanation:
Spirogyra is an examples of chlorophyceae and sexual reproduction takes place through the fusion of two morphologically identical but physiologically dissimilar non- ciliated gametes. The fusion of both kinds of gametes results into formation of zygospores. The germinating diploid zygospores undergoes meiosis to maintain the haploid condition. Thus, in the condition tetranucleate condition is found for a brief period of time.
259224
In blue-green algae, photosystem-II contains important pigment concerned with photolysis of water. It is a:
1 Phycocyanin
2 Cytochrome-c
3 Chlorophyll-b
4 $\beta$-carotene
Explanation:
In BGA (Blue Green Algae) Photo system-II contains important pigment concerned with photolysis of water. It is phycocynin or phycoerythrin. It is an pigment protein complex found in cyanobacteria.
AIIMS-2015
Plant kingdom
259225
Water blooms are formed by:
1 Planaktonic algae
2 Lemna
3 Rhizopus
4 Wolffia
Explanation:
Water blooms are formed by planktonic algae. Planktonic algae are microscopic plants that live in every drop of pond water, planktonic algae are important because they produce oxygen and food for the animals that live in the pond. It forms a layer over the surface of the water. It is promoted by the release of the inorganic and organic compounds in the water body by the agricultural field run off, industrial discharge and untreated sewage. This is called eutrophication because it builds up the substratum of the water body. It depletes the dissolved oxygen level because the decomposing bacteria get activated to breakdown the organic compounds
J and K CET-2000
Plant kingdom
259227
Which of the following algae shows physiological anisogamy?
1 Spirogyra
2 Ulothrix
3 Volvox
4 All of these
Explanation:
In spirogyra, all filamentous cells have the capacity to develop gametes, sometimes known as isogametes because of their identical morphology. This phenomena of sexual reproduction is known as isogamous type of sexual reproduction. But at the time of conjugation one of the two isogametes shows motility and is considered as male gamete. This phenomenon is referred to as physiological anisogamy.
JCECE-2002
Plant kingdom
259228
Which one set of genera are correctly matched?
1 Chlorophyceae- Volvax, Laminaria, Fucus
2 Phaeophyceae- Laminaria, Chlamydomonas
3 Rhodophyceae- Gelidium, Gracilaria
4 Phaeophyceae- Laminarea, Sargassum, Ulothrix
Explanation:
Rhodophyceae includes - Geliduim, Gracilaria, Porphyra and Polysiphonia. Where as chorophyceae includes - Chlorella, Chlomydomonas, Spirogyra, Chara, Volvox, Ulothrix, phaeophyceae includes - kelp, Sargassum, Laminaria etc.
BVP-2014
Plant kingdom
259230
In Spirogyra, a brief period of tetranucleate condition is found in-
1 hold fast
2 gametangium
3 vegetative cell
4 germinating zygote
Explanation:
Spirogyra is an examples of chlorophyceae and sexual reproduction takes place through the fusion of two morphologically identical but physiologically dissimilar non- ciliated gametes. The fusion of both kinds of gametes results into formation of zygospores. The germinating diploid zygospores undergoes meiosis to maintain the haploid condition. Thus, in the condition tetranucleate condition is found for a brief period of time.
