285831
Which of the following statements regarding cyanobacteria is incorrect?
1 Itis also called blue green algae.
2 They are chemosynthetic autotrophs.
3 It forms blooms in polluted water bodies.
4 It is unicellular, colonial or filamentous, marine or terrestrial bacteria.
Explanation:
(b) Cyanobacteria are photosynthetic (containing a blue photosynthetic pigment) autotrophs. They are prokaryotic and represent the earliest known form of life on the Earth.
NCERT Page-18
BIOLOGICAL CLASSIFICATION(NCERT)
285832
Which of the following component enablesarchaebacteria to survive in extreme conditions?
1 Cell wall
2 Cell membrane
3 Membrane proteins
4 Ion exchange pumps
Explanation:
(a) Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible for their survival in extreme conditions.
NCERT Page-19/ N-13
BIOLOGICAL CLASSIFICATION(NCERT)
285833
The vast majority of bacteria are:
1 Photosynthetic Autotrophs
2 Chemosynthetic Autotrophs
3 Heterotrophs
4 both $a$ and $b$
Explanation:
(c) The vast majority of bacteria are heterotrophs, i.e., they depend on other organisms or on dead organic matter for food.
NCERT Page-19/ N-13
BIOLOGICAL CLASSIFICATION(NCERT)
285834
The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are categorised as
1 cyanobacteria
2 archaebacteria
3 chemosynthetic autotrophs
4 heterotrophic bacteria
Explanation:
(d) The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the heterotrophic bacteria. Lactobacillis bacteria convert milk into curd.
BIOLOGICAL CLASSIFICATION(NCERT)
285835
Foodcan be kept for a longer time in cold house than in normal conditions because
1 insect cannot enter.
2 bacterial multiplication stops.
3 bacterial multiplicationis reduced.
4 there is plasmolysis at low temperature.
Explanation:
(c) Food can be kept for a longer time in cold house than in normal condition because bacterial multiplication is reduced in cold house.
285831
Which of the following statements regarding cyanobacteria is incorrect?
1 Itis also called blue green algae.
2 They are chemosynthetic autotrophs.
3 It forms blooms in polluted water bodies.
4 It is unicellular, colonial or filamentous, marine or terrestrial bacteria.
Explanation:
(b) Cyanobacteria are photosynthetic (containing a blue photosynthetic pigment) autotrophs. They are prokaryotic and represent the earliest known form of life on the Earth.
NCERT Page-18
BIOLOGICAL CLASSIFICATION(NCERT)
285832
Which of the following component enablesarchaebacteria to survive in extreme conditions?
1 Cell wall
2 Cell membrane
3 Membrane proteins
4 Ion exchange pumps
Explanation:
(a) Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible for their survival in extreme conditions.
NCERT Page-19/ N-13
BIOLOGICAL CLASSIFICATION(NCERT)
285833
The vast majority of bacteria are:
1 Photosynthetic Autotrophs
2 Chemosynthetic Autotrophs
3 Heterotrophs
4 both $a$ and $b$
Explanation:
(c) The vast majority of bacteria are heterotrophs, i.e., they depend on other organisms or on dead organic matter for food.
NCERT Page-19/ N-13
BIOLOGICAL CLASSIFICATION(NCERT)
285834
The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are categorised as
1 cyanobacteria
2 archaebacteria
3 chemosynthetic autotrophs
4 heterotrophic bacteria
Explanation:
(d) The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the heterotrophic bacteria. Lactobacillis bacteria convert milk into curd.
BIOLOGICAL CLASSIFICATION(NCERT)
285835
Foodcan be kept for a longer time in cold house than in normal conditions because
1 insect cannot enter.
2 bacterial multiplication stops.
3 bacterial multiplicationis reduced.
4 there is plasmolysis at low temperature.
Explanation:
(c) Food can be kept for a longer time in cold house than in normal condition because bacterial multiplication is reduced in cold house.
285831
Which of the following statements regarding cyanobacteria is incorrect?
1 Itis also called blue green algae.
2 They are chemosynthetic autotrophs.
3 It forms blooms in polluted water bodies.
4 It is unicellular, colonial or filamentous, marine or terrestrial bacteria.
Explanation:
(b) Cyanobacteria are photosynthetic (containing a blue photosynthetic pigment) autotrophs. They are prokaryotic and represent the earliest known form of life on the Earth.
NCERT Page-18
BIOLOGICAL CLASSIFICATION(NCERT)
285832
Which of the following component enablesarchaebacteria to survive in extreme conditions?
1 Cell wall
2 Cell membrane
3 Membrane proteins
4 Ion exchange pumps
Explanation:
(a) Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible for their survival in extreme conditions.
NCERT Page-19/ N-13
BIOLOGICAL CLASSIFICATION(NCERT)
285833
The vast majority of bacteria are:
1 Photosynthetic Autotrophs
2 Chemosynthetic Autotrophs
3 Heterotrophs
4 both $a$ and $b$
Explanation:
(c) The vast majority of bacteria are heterotrophs, i.e., they depend on other organisms or on dead organic matter for food.
NCERT Page-19/ N-13
BIOLOGICAL CLASSIFICATION(NCERT)
285834
The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are categorised as
1 cyanobacteria
2 archaebacteria
3 chemosynthetic autotrophs
4 heterotrophic bacteria
Explanation:
(d) The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the heterotrophic bacteria. Lactobacillis bacteria convert milk into curd.
BIOLOGICAL CLASSIFICATION(NCERT)
285835
Foodcan be kept for a longer time in cold house than in normal conditions because
1 insect cannot enter.
2 bacterial multiplication stops.
3 bacterial multiplicationis reduced.
4 there is plasmolysis at low temperature.
Explanation:
(c) Food can be kept for a longer time in cold house than in normal condition because bacterial multiplication is reduced in cold house.
285831
Which of the following statements regarding cyanobacteria is incorrect?
1 Itis also called blue green algae.
2 They are chemosynthetic autotrophs.
3 It forms blooms in polluted water bodies.
4 It is unicellular, colonial or filamentous, marine or terrestrial bacteria.
Explanation:
(b) Cyanobacteria are photosynthetic (containing a blue photosynthetic pigment) autotrophs. They are prokaryotic and represent the earliest known form of life on the Earth.
NCERT Page-18
BIOLOGICAL CLASSIFICATION(NCERT)
285832
Which of the following component enablesarchaebacteria to survive in extreme conditions?
1 Cell wall
2 Cell membrane
3 Membrane proteins
4 Ion exchange pumps
Explanation:
(a) Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible for their survival in extreme conditions.
NCERT Page-19/ N-13
BIOLOGICAL CLASSIFICATION(NCERT)
285833
The vast majority of bacteria are:
1 Photosynthetic Autotrophs
2 Chemosynthetic Autotrophs
3 Heterotrophs
4 both $a$ and $b$
Explanation:
(c) The vast majority of bacteria are heterotrophs, i.e., they depend on other organisms or on dead organic matter for food.
NCERT Page-19/ N-13
BIOLOGICAL CLASSIFICATION(NCERT)
285834
The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are categorised as
1 cyanobacteria
2 archaebacteria
3 chemosynthetic autotrophs
4 heterotrophic bacteria
Explanation:
(d) The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the heterotrophic bacteria. Lactobacillis bacteria convert milk into curd.
BIOLOGICAL CLASSIFICATION(NCERT)
285835
Foodcan be kept for a longer time in cold house than in normal conditions because
1 insect cannot enter.
2 bacterial multiplication stops.
3 bacterial multiplicationis reduced.
4 there is plasmolysis at low temperature.
Explanation:
(c) Food can be kept for a longer time in cold house than in normal condition because bacterial multiplication is reduced in cold house.
285831
Which of the following statements regarding cyanobacteria is incorrect?
1 Itis also called blue green algae.
2 They are chemosynthetic autotrophs.
3 It forms blooms in polluted water bodies.
4 It is unicellular, colonial or filamentous, marine or terrestrial bacteria.
Explanation:
(b) Cyanobacteria are photosynthetic (containing a blue photosynthetic pigment) autotrophs. They are prokaryotic and represent the earliest known form of life on the Earth.
NCERT Page-18
BIOLOGICAL CLASSIFICATION(NCERT)
285832
Which of the following component enablesarchaebacteria to survive in extreme conditions?
1 Cell wall
2 Cell membrane
3 Membrane proteins
4 Ion exchange pumps
Explanation:
(a) Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible for their survival in extreme conditions.
NCERT Page-19/ N-13
BIOLOGICAL CLASSIFICATION(NCERT)
285833
The vast majority of bacteria are:
1 Photosynthetic Autotrophs
2 Chemosynthetic Autotrophs
3 Heterotrophs
4 both $a$ and $b$
Explanation:
(c) The vast majority of bacteria are heterotrophs, i.e., they depend on other organisms or on dead organic matter for food.
NCERT Page-19/ N-13
BIOLOGICAL CLASSIFICATION(NCERT)
285834
The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are categorised as
1 cyanobacteria
2 archaebacteria
3 chemosynthetic autotrophs
4 heterotrophic bacteria
Explanation:
(d) The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the heterotrophic bacteria. Lactobacillis bacteria convert milk into curd.
BIOLOGICAL CLASSIFICATION(NCERT)
285835
Foodcan be kept for a longer time in cold house than in normal conditions because
1 insect cannot enter.
2 bacterial multiplication stops.
3 bacterial multiplicationis reduced.
4 there is plasmolysis at low temperature.
Explanation:
(c) Food can be kept for a longer time in cold house than in normal condition because bacterial multiplication is reduced in cold house.
