Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
BIOXI03: PLANT KINGDOM
331678
In algae what are the modes of reproduction?
1 Vegetative
2 Asexual
3 Sexual
4 All of these
Explanation:
The algae reproduce by vegetative, asexual and sexual methods.
BIOXI03: PLANT KINGDOM
331679
Fusion of two motile gametes which are dissimilar in size is termed as
1 Oogamy
2 Isogamy
3 Anisogamy
4 Zoogamy
Explanation:
Size of gametes is dissimilar and hence term ‘Anisogamy’ is used.
NCERT Exempler
BIOXI03: PLANT KINGDOM
331680
Assertion : Bryophytes possess archegonium as a female sex organ. Reason : Algae also possess the archegonium.
1 Both Assertion and Reason are true and Reason is correct explanation of Assertion.
2 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
3 Assertion is true but Reason is false.
4 Both Assertion and Reason are false.
Explanation:
The female sex organ of the bryophytes i s a remarkable structure, it appears for the first time in the liverworts and mosses, it continues in the pteridophytes. Archegonium is absent in thallophytes (algae and fungi). Sex organs in them are male gametes and female gametes.
BIOXI03: PLANT KINGDOM
331681
Algae
1 Contributes to aquatic food
2 Contributes to dissolved oxygen
3 Is used in production of commercial products like agar, hydrocolloids
4 All of them
Explanation:
Algae are useful to man in a variety of ways. Being photosynthetic they increase the level of dissolved oxygen in their immediate environment. They are of paramount importance as primary producers of energy rich compounds which form the basis of the food cycles of all aquatic animals. Many species of Porphyra, Laminaria and Sargassum are among the 70 species of marine algae used as food. Certain algae are used to obtain commericial products like agar-agar.
Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
BIOXI03: PLANT KINGDOM
331678
In algae what are the modes of reproduction?
1 Vegetative
2 Asexual
3 Sexual
4 All of these
Explanation:
The algae reproduce by vegetative, asexual and sexual methods.
BIOXI03: PLANT KINGDOM
331679
Fusion of two motile gametes which are dissimilar in size is termed as
1 Oogamy
2 Isogamy
3 Anisogamy
4 Zoogamy
Explanation:
Size of gametes is dissimilar and hence term ‘Anisogamy’ is used.
NCERT Exempler
BIOXI03: PLANT KINGDOM
331680
Assertion : Bryophytes possess archegonium as a female sex organ. Reason : Algae also possess the archegonium.
1 Both Assertion and Reason are true and Reason is correct explanation of Assertion.
2 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
3 Assertion is true but Reason is false.
4 Both Assertion and Reason are false.
Explanation:
The female sex organ of the bryophytes i s a remarkable structure, it appears for the first time in the liverworts and mosses, it continues in the pteridophytes. Archegonium is absent in thallophytes (algae and fungi). Sex organs in them are male gametes and female gametes.
BIOXI03: PLANT KINGDOM
331681
Algae
1 Contributes to aquatic food
2 Contributes to dissolved oxygen
3 Is used in production of commercial products like agar, hydrocolloids
4 All of them
Explanation:
Algae are useful to man in a variety of ways. Being photosynthetic they increase the level of dissolved oxygen in their immediate environment. They are of paramount importance as primary producers of energy rich compounds which form the basis of the food cycles of all aquatic animals. Many species of Porphyra, Laminaria and Sargassum are among the 70 species of marine algae used as food. Certain algae are used to obtain commericial products like agar-agar.
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BIOXI03: PLANT KINGDOM
331677
Agar, finds its use
1 To grow microbes
2 In preparations of ice-creams and jellies
3 Both 1 and 2
4 Polishing and purification of oils and syrups
Explanation:
Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
BIOXI03: PLANT KINGDOM
331678
In algae what are the modes of reproduction?
1 Vegetative
2 Asexual
3 Sexual
4 All of these
Explanation:
The algae reproduce by vegetative, asexual and sexual methods.
BIOXI03: PLANT KINGDOM
331679
Fusion of two motile gametes which are dissimilar in size is termed as
1 Oogamy
2 Isogamy
3 Anisogamy
4 Zoogamy
Explanation:
Size of gametes is dissimilar and hence term ‘Anisogamy’ is used.
NCERT Exempler
BIOXI03: PLANT KINGDOM
331680
Assertion : Bryophytes possess archegonium as a female sex organ. Reason : Algae also possess the archegonium.
1 Both Assertion and Reason are true and Reason is correct explanation of Assertion.
2 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
3 Assertion is true but Reason is false.
4 Both Assertion and Reason are false.
Explanation:
The female sex organ of the bryophytes i s a remarkable structure, it appears for the first time in the liverworts and mosses, it continues in the pteridophytes. Archegonium is absent in thallophytes (algae and fungi). Sex organs in them are male gametes and female gametes.
BIOXI03: PLANT KINGDOM
331681
Algae
1 Contributes to aquatic food
2 Contributes to dissolved oxygen
3 Is used in production of commercial products like agar, hydrocolloids
4 All of them
Explanation:
Algae are useful to man in a variety of ways. Being photosynthetic they increase the level of dissolved oxygen in their immediate environment. They are of paramount importance as primary producers of energy rich compounds which form the basis of the food cycles of all aquatic animals. Many species of Porphyra, Laminaria and Sargassum are among the 70 species of marine algae used as food. Certain algae are used to obtain commericial products like agar-agar.
Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
BIOXI03: PLANT KINGDOM
331678
In algae what are the modes of reproduction?
1 Vegetative
2 Asexual
3 Sexual
4 All of these
Explanation:
The algae reproduce by vegetative, asexual and sexual methods.
BIOXI03: PLANT KINGDOM
331679
Fusion of two motile gametes which are dissimilar in size is termed as
1 Oogamy
2 Isogamy
3 Anisogamy
4 Zoogamy
Explanation:
Size of gametes is dissimilar and hence term ‘Anisogamy’ is used.
NCERT Exempler
BIOXI03: PLANT KINGDOM
331680
Assertion : Bryophytes possess archegonium as a female sex organ. Reason : Algae also possess the archegonium.
1 Both Assertion and Reason are true and Reason is correct explanation of Assertion.
2 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
3 Assertion is true but Reason is false.
4 Both Assertion and Reason are false.
Explanation:
The female sex organ of the bryophytes i s a remarkable structure, it appears for the first time in the liverworts and mosses, it continues in the pteridophytes. Archegonium is absent in thallophytes (algae and fungi). Sex organs in them are male gametes and female gametes.
BIOXI03: PLANT KINGDOM
331681
Algae
1 Contributes to aquatic food
2 Contributes to dissolved oxygen
3 Is used in production of commercial products like agar, hydrocolloids
4 All of them
Explanation:
Algae are useful to man in a variety of ways. Being photosynthetic they increase the level of dissolved oxygen in their immediate environment. They are of paramount importance as primary producers of energy rich compounds which form the basis of the food cycles of all aquatic animals. Many species of Porphyra, Laminaria and Sargassum are among the 70 species of marine algae used as food. Certain algae are used to obtain commericial products like agar-agar.
Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
BIOXI03: PLANT KINGDOM
331678
In algae what are the modes of reproduction?
1 Vegetative
2 Asexual
3 Sexual
4 All of these
Explanation:
The algae reproduce by vegetative, asexual and sexual methods.
BIOXI03: PLANT KINGDOM
331679
Fusion of two motile gametes which are dissimilar in size is termed as
1 Oogamy
2 Isogamy
3 Anisogamy
4 Zoogamy
Explanation:
Size of gametes is dissimilar and hence term ‘Anisogamy’ is used.
NCERT Exempler
BIOXI03: PLANT KINGDOM
331680
Assertion : Bryophytes possess archegonium as a female sex organ. Reason : Algae also possess the archegonium.
1 Both Assertion and Reason are true and Reason is correct explanation of Assertion.
2 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
3 Assertion is true but Reason is false.
4 Both Assertion and Reason are false.
Explanation:
The female sex organ of the bryophytes i s a remarkable structure, it appears for the first time in the liverworts and mosses, it continues in the pteridophytes. Archegonium is absent in thallophytes (algae and fungi). Sex organs in them are male gametes and female gametes.
BIOXI03: PLANT KINGDOM
331681
Algae
1 Contributes to aquatic food
2 Contributes to dissolved oxygen
3 Is used in production of commercial products like agar, hydrocolloids
4 All of them
Explanation:
Algae are useful to man in a variety of ways. Being photosynthetic they increase the level of dissolved oxygen in their immediate environment. They are of paramount importance as primary producers of energy rich compounds which form the basis of the food cycles of all aquatic animals. Many species of Porphyra, Laminaria and Sargassum are among the 70 species of marine algae used as food. Certain algae are used to obtain commericial products like agar-agar.