286688
Which one of the following statements concerning the algae is incorrect?
1 Most algae are photosynthetic.
2 Algae can be classified according to their pigments.
3 All algae are filamentous.
4 Spirogyra does not produce zoospores.
Explanation:
(c) Algae are defined as chlorophyllous, thailloid avascular plants with no cellular differentiation. The size and form of algae is highly variable. Not all the algae are filamentous. The size ranges from the microscope unicellular forms to colonial forms and to the filamentous forms.
NCERT Page-30 / N-24
PLANT KINGDOM(NCERT)
286689
Which of the following example belong to the same class of algae?
1 Chara, Fucus, Polysiphonia
2 Volvox, Spirogyra, Chlamydomonas
3 Porphyra, Ectocarpus, Ulothrix
4 Sargassum, Laminaria, Gracilaria
Explanation:
(b)Chlamydomonas, Volvox, Ulothrix, Spirogyra and Chara are green algae. The common forms of brown algae are Ectocarpus, Dictyota, Laminaria, Sargassum and Fucus. Polysiphonia, Porphyra, Gracilaria and the Gelidium are members of red algae.
NCERT Page-32 / N-26
PLANT KINGDOM(NCERT)
286690
A research student collected certain alga and found that its cells contained both chlorophyll $a$ and chlorophyll $d$ as well as phycoerythrin. On the basis of his observation, the students conclude that the alga belongs to
1 Rhodophyceae
2 bacillariophyceae
3 Chlorophyceae
4 phaeophyceae
Explanation:
(a) In green algae (chlorophyceae), the photosynthetic pigments are chlorophyll $a$ and $b$, carotenes and xanthophylls. In phaeophyceae (brown algae), the pigments are chlorophyll $a,c$ and carotenes and fucoxanth. Rhodophyceae are red algae and contain the major pigment as chlorophyll a and phycoerythrin. Phycoerythrin gives red colour to rhodophyceae.
NCERT Page-33 / N-27
PLANT KINGDOM(NCERT)
286691
If you are asked to classify the various algae into distinct groups then which of the following characters you should choosefor the classification?
1 Nature of habitat
2 Structural organization of thallus
3 Chemical composition of the cell wall
4 Types of pigments present in the cell
Explanation:
(d)The classification of algae can be visually done easily on the basis of colours, due to the presence of different pigments inside them.
286688
Which one of the following statements concerning the algae is incorrect?
1 Most algae are photosynthetic.
2 Algae can be classified according to their pigments.
3 All algae are filamentous.
4 Spirogyra does not produce zoospores.
Explanation:
(c) Algae are defined as chlorophyllous, thailloid avascular plants with no cellular differentiation. The size and form of algae is highly variable. Not all the algae are filamentous. The size ranges from the microscope unicellular forms to colonial forms and to the filamentous forms.
NCERT Page-30 / N-24
PLANT KINGDOM(NCERT)
286689
Which of the following example belong to the same class of algae?
1 Chara, Fucus, Polysiphonia
2 Volvox, Spirogyra, Chlamydomonas
3 Porphyra, Ectocarpus, Ulothrix
4 Sargassum, Laminaria, Gracilaria
Explanation:
(b)Chlamydomonas, Volvox, Ulothrix, Spirogyra and Chara are green algae. The common forms of brown algae are Ectocarpus, Dictyota, Laminaria, Sargassum and Fucus. Polysiphonia, Porphyra, Gracilaria and the Gelidium are members of red algae.
NCERT Page-32 / N-26
PLANT KINGDOM(NCERT)
286690
A research student collected certain alga and found that its cells contained both chlorophyll $a$ and chlorophyll $d$ as well as phycoerythrin. On the basis of his observation, the students conclude that the alga belongs to
1 Rhodophyceae
2 bacillariophyceae
3 Chlorophyceae
4 phaeophyceae
Explanation:
(a) In green algae (chlorophyceae), the photosynthetic pigments are chlorophyll $a$ and $b$, carotenes and xanthophylls. In phaeophyceae (brown algae), the pigments are chlorophyll $a,c$ and carotenes and fucoxanth. Rhodophyceae are red algae and contain the major pigment as chlorophyll a and phycoerythrin. Phycoerythrin gives red colour to rhodophyceae.
NCERT Page-33 / N-27
PLANT KINGDOM(NCERT)
286691
If you are asked to classify the various algae into distinct groups then which of the following characters you should choosefor the classification?
1 Nature of habitat
2 Structural organization of thallus
3 Chemical composition of the cell wall
4 Types of pigments present in the cell
Explanation:
(d)The classification of algae can be visually done easily on the basis of colours, due to the presence of different pigments inside them.
286688
Which one of the following statements concerning the algae is incorrect?
1 Most algae are photosynthetic.
2 Algae can be classified according to their pigments.
3 All algae are filamentous.
4 Spirogyra does not produce zoospores.
Explanation:
(c) Algae are defined as chlorophyllous, thailloid avascular plants with no cellular differentiation. The size and form of algae is highly variable. Not all the algae are filamentous. The size ranges from the microscope unicellular forms to colonial forms and to the filamentous forms.
NCERT Page-30 / N-24
PLANT KINGDOM(NCERT)
286689
Which of the following example belong to the same class of algae?
1 Chara, Fucus, Polysiphonia
2 Volvox, Spirogyra, Chlamydomonas
3 Porphyra, Ectocarpus, Ulothrix
4 Sargassum, Laminaria, Gracilaria
Explanation:
(b)Chlamydomonas, Volvox, Ulothrix, Spirogyra and Chara are green algae. The common forms of brown algae are Ectocarpus, Dictyota, Laminaria, Sargassum and Fucus. Polysiphonia, Porphyra, Gracilaria and the Gelidium are members of red algae.
NCERT Page-32 / N-26
PLANT KINGDOM(NCERT)
286690
A research student collected certain alga and found that its cells contained both chlorophyll $a$ and chlorophyll $d$ as well as phycoerythrin. On the basis of his observation, the students conclude that the alga belongs to
1 Rhodophyceae
2 bacillariophyceae
3 Chlorophyceae
4 phaeophyceae
Explanation:
(a) In green algae (chlorophyceae), the photosynthetic pigments are chlorophyll $a$ and $b$, carotenes and xanthophylls. In phaeophyceae (brown algae), the pigments are chlorophyll $a,c$ and carotenes and fucoxanth. Rhodophyceae are red algae and contain the major pigment as chlorophyll a and phycoerythrin. Phycoerythrin gives red colour to rhodophyceae.
NCERT Page-33 / N-27
PLANT KINGDOM(NCERT)
286691
If you are asked to classify the various algae into distinct groups then which of the following characters you should choosefor the classification?
1 Nature of habitat
2 Structural organization of thallus
3 Chemical composition of the cell wall
4 Types of pigments present in the cell
Explanation:
(d)The classification of algae can be visually done easily on the basis of colours, due to the presence of different pigments inside them.
286688
Which one of the following statements concerning the algae is incorrect?
1 Most algae are photosynthetic.
2 Algae can be classified according to their pigments.
3 All algae are filamentous.
4 Spirogyra does not produce zoospores.
Explanation:
(c) Algae are defined as chlorophyllous, thailloid avascular plants with no cellular differentiation. The size and form of algae is highly variable. Not all the algae are filamentous. The size ranges from the microscope unicellular forms to colonial forms and to the filamentous forms.
NCERT Page-30 / N-24
PLANT KINGDOM(NCERT)
286689
Which of the following example belong to the same class of algae?
1 Chara, Fucus, Polysiphonia
2 Volvox, Spirogyra, Chlamydomonas
3 Porphyra, Ectocarpus, Ulothrix
4 Sargassum, Laminaria, Gracilaria
Explanation:
(b)Chlamydomonas, Volvox, Ulothrix, Spirogyra and Chara are green algae. The common forms of brown algae are Ectocarpus, Dictyota, Laminaria, Sargassum and Fucus. Polysiphonia, Porphyra, Gracilaria and the Gelidium are members of red algae.
NCERT Page-32 / N-26
PLANT KINGDOM(NCERT)
286690
A research student collected certain alga and found that its cells contained both chlorophyll $a$ and chlorophyll $d$ as well as phycoerythrin. On the basis of his observation, the students conclude that the alga belongs to
1 Rhodophyceae
2 bacillariophyceae
3 Chlorophyceae
4 phaeophyceae
Explanation:
(a) In green algae (chlorophyceae), the photosynthetic pigments are chlorophyll $a$ and $b$, carotenes and xanthophylls. In phaeophyceae (brown algae), the pigments are chlorophyll $a,c$ and carotenes and fucoxanth. Rhodophyceae are red algae and contain the major pigment as chlorophyll a and phycoerythrin. Phycoerythrin gives red colour to rhodophyceae.
NCERT Page-33 / N-27
PLANT KINGDOM(NCERT)
286691
If you are asked to classify the various algae into distinct groups then which of the following characters you should choosefor the classification?
1 Nature of habitat
2 Structural organization of thallus
3 Chemical composition of the cell wall
4 Types of pigments present in the cell
Explanation:
(d)The classification of algae can be visually done easily on the basis of colours, due to the presence of different pigments inside them.
