285872
Which of the following statements is incorrect?
1 TMV has a double-stranded RNA molecule.
2 Most plant viruses are RNA viruses.
3 The bacteriophage has double-stranded DNA.
4 Most animal viruses are DNA viruses.
Explanation:
(a) Tobacco mosaic virus (TMV) is a single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanacea.
NCERT Page-25 / N-20
BIOLOGICAL CLASSIFICATION(NCERT)
285875
T. O.Diener discovered a new infectious agent that was smaller than viruses and have the following characteristics.
(i) It causes potato spindle tuber disease.
(ii) It has free RNA.
(iii) Molecular weight of RNA is low.
Identify the infections agent.
1 Prions
2 Viroids
3 Lichens
4 Mycoplasma
Explanation:
(b) Viröids cause potato spindle tuber disease (PSTV), chrysanthemum stunt, citrus exocortis, cucumber pale fruit etc. They cause persistent infections, i.e., never recovered.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285876
The symbiotic association between fungi and algae is called
1 lichen
2 mycorrhiza
3 rhizome
4 endomycorrhiza
Explanation:
(a) The symbiotic association of fungi and algae is called Lichen. In lichen, there are two components i.e., algal partner called phycobiont and fungal partner called mycobiont.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285877
Lichens indicate $\text{S}{{\text{O}}_{2}}$ pollution because they
1 show association between algae and fungi.
2 grow faster thanothers.
3 are sensitive to $\text{S}{{\text{O}}_{2}}$.
4 flourish in $\text{S}{{\text{O}}_{2}}$ rich environment.
Explanation:
(c) Lichens are formed by symbiotic relationship between algae or cyanobacteria and fungi. Lichens typically grow in harsh environments most lichens, especially epiphytic fruticose species and those containing cyanobacteria, are sensitive to pollutants. Hence, they have been widely used as $\text{S}{{\text{O}}_{2}}$ pollution indicator organisms.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285878
Which of the following are most suitable indicators of $\text{S}{{\text{O}}_{2}}$ pollution in the environment?
1 Conifers
2 Algae
3 Fungi
4 Lichens
Explanation:
(d) Lichens cannot grow in the place where sulpher dioxide, pollutant is available in the environment.
285872
Which of the following statements is incorrect?
1 TMV has a double-stranded RNA molecule.
2 Most plant viruses are RNA viruses.
3 The bacteriophage has double-stranded DNA.
4 Most animal viruses are DNA viruses.
Explanation:
(a) Tobacco mosaic virus (TMV) is a single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanacea.
NCERT Page-25 / N-20
BIOLOGICAL CLASSIFICATION(NCERT)
285875
T. O.Diener discovered a new infectious agent that was smaller than viruses and have the following characteristics.
(i) It causes potato spindle tuber disease.
(ii) It has free RNA.
(iii) Molecular weight of RNA is low.
Identify the infections agent.
1 Prions
2 Viroids
3 Lichens
4 Mycoplasma
Explanation:
(b) Viröids cause potato spindle tuber disease (PSTV), chrysanthemum stunt, citrus exocortis, cucumber pale fruit etc. They cause persistent infections, i.e., never recovered.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285876
The symbiotic association between fungi and algae is called
1 lichen
2 mycorrhiza
3 rhizome
4 endomycorrhiza
Explanation:
(a) The symbiotic association of fungi and algae is called Lichen. In lichen, there are two components i.e., algal partner called phycobiont and fungal partner called mycobiont.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285877
Lichens indicate $\text{S}{{\text{O}}_{2}}$ pollution because they
1 show association between algae and fungi.
2 grow faster thanothers.
3 are sensitive to $\text{S}{{\text{O}}_{2}}$.
4 flourish in $\text{S}{{\text{O}}_{2}}$ rich environment.
Explanation:
(c) Lichens are formed by symbiotic relationship between algae or cyanobacteria and fungi. Lichens typically grow in harsh environments most lichens, especially epiphytic fruticose species and those containing cyanobacteria, are sensitive to pollutants. Hence, they have been widely used as $\text{S}{{\text{O}}_{2}}$ pollution indicator organisms.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285878
Which of the following are most suitable indicators of $\text{S}{{\text{O}}_{2}}$ pollution in the environment?
1 Conifers
2 Algae
3 Fungi
4 Lichens
Explanation:
(d) Lichens cannot grow in the place where sulpher dioxide, pollutant is available in the environment.
285872
Which of the following statements is incorrect?
1 TMV has a double-stranded RNA molecule.
2 Most plant viruses are RNA viruses.
3 The bacteriophage has double-stranded DNA.
4 Most animal viruses are DNA viruses.
Explanation:
(a) Tobacco mosaic virus (TMV) is a single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanacea.
NCERT Page-25 / N-20
BIOLOGICAL CLASSIFICATION(NCERT)
285875
T. O.Diener discovered a new infectious agent that was smaller than viruses and have the following characteristics.
(i) It causes potato spindle tuber disease.
(ii) It has free RNA.
(iii) Molecular weight of RNA is low.
Identify the infections agent.
1 Prions
2 Viroids
3 Lichens
4 Mycoplasma
Explanation:
(b) Viröids cause potato spindle tuber disease (PSTV), chrysanthemum stunt, citrus exocortis, cucumber pale fruit etc. They cause persistent infections, i.e., never recovered.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285876
The symbiotic association between fungi and algae is called
1 lichen
2 mycorrhiza
3 rhizome
4 endomycorrhiza
Explanation:
(a) The symbiotic association of fungi and algae is called Lichen. In lichen, there are two components i.e., algal partner called phycobiont and fungal partner called mycobiont.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285877
Lichens indicate $\text{S}{{\text{O}}_{2}}$ pollution because they
1 show association between algae and fungi.
2 grow faster thanothers.
3 are sensitive to $\text{S}{{\text{O}}_{2}}$.
4 flourish in $\text{S}{{\text{O}}_{2}}$ rich environment.
Explanation:
(c) Lichens are formed by symbiotic relationship between algae or cyanobacteria and fungi. Lichens typically grow in harsh environments most lichens, especially epiphytic fruticose species and those containing cyanobacteria, are sensitive to pollutants. Hence, they have been widely used as $\text{S}{{\text{O}}_{2}}$ pollution indicator organisms.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285878
Which of the following are most suitable indicators of $\text{S}{{\text{O}}_{2}}$ pollution in the environment?
1 Conifers
2 Algae
3 Fungi
4 Lichens
Explanation:
(d) Lichens cannot grow in the place where sulpher dioxide, pollutant is available in the environment.
285872
Which of the following statements is incorrect?
1 TMV has a double-stranded RNA molecule.
2 Most plant viruses are RNA viruses.
3 The bacteriophage has double-stranded DNA.
4 Most animal viruses are DNA viruses.
Explanation:
(a) Tobacco mosaic virus (TMV) is a single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanacea.
NCERT Page-25 / N-20
BIOLOGICAL CLASSIFICATION(NCERT)
285875
T. O.Diener discovered a new infectious agent that was smaller than viruses and have the following characteristics.
(i) It causes potato spindle tuber disease.
(ii) It has free RNA.
(iii) Molecular weight of RNA is low.
Identify the infections agent.
1 Prions
2 Viroids
3 Lichens
4 Mycoplasma
Explanation:
(b) Viröids cause potato spindle tuber disease (PSTV), chrysanthemum stunt, citrus exocortis, cucumber pale fruit etc. They cause persistent infections, i.e., never recovered.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285876
The symbiotic association between fungi and algae is called
1 lichen
2 mycorrhiza
3 rhizome
4 endomycorrhiza
Explanation:
(a) The symbiotic association of fungi and algae is called Lichen. In lichen, there are two components i.e., algal partner called phycobiont and fungal partner called mycobiont.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285877
Lichens indicate $\text{S}{{\text{O}}_{2}}$ pollution because they
1 show association between algae and fungi.
2 grow faster thanothers.
3 are sensitive to $\text{S}{{\text{O}}_{2}}$.
4 flourish in $\text{S}{{\text{O}}_{2}}$ rich environment.
Explanation:
(c) Lichens are formed by symbiotic relationship between algae or cyanobacteria and fungi. Lichens typically grow in harsh environments most lichens, especially epiphytic fruticose species and those containing cyanobacteria, are sensitive to pollutants. Hence, they have been widely used as $\text{S}{{\text{O}}_{2}}$ pollution indicator organisms.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285878
Which of the following are most suitable indicators of $\text{S}{{\text{O}}_{2}}$ pollution in the environment?
1 Conifers
2 Algae
3 Fungi
4 Lichens
Explanation:
(d) Lichens cannot grow in the place where sulpher dioxide, pollutant is available in the environment.
285872
Which of the following statements is incorrect?
1 TMV has a double-stranded RNA molecule.
2 Most plant viruses are RNA viruses.
3 The bacteriophage has double-stranded DNA.
4 Most animal viruses are DNA viruses.
Explanation:
(a) Tobacco mosaic virus (TMV) is a single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanacea.
NCERT Page-25 / N-20
BIOLOGICAL CLASSIFICATION(NCERT)
285875
T. O.Diener discovered a new infectious agent that was smaller than viruses and have the following characteristics.
(i) It causes potato spindle tuber disease.
(ii) It has free RNA.
(iii) Molecular weight of RNA is low.
Identify the infections agent.
1 Prions
2 Viroids
3 Lichens
4 Mycoplasma
Explanation:
(b) Viröids cause potato spindle tuber disease (PSTV), chrysanthemum stunt, citrus exocortis, cucumber pale fruit etc. They cause persistent infections, i.e., never recovered.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285876
The symbiotic association between fungi and algae is called
1 lichen
2 mycorrhiza
3 rhizome
4 endomycorrhiza
Explanation:
(a) The symbiotic association of fungi and algae is called Lichen. In lichen, there are two components i.e., algal partner called phycobiont and fungal partner called mycobiont.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285877
Lichens indicate $\text{S}{{\text{O}}_{2}}$ pollution because they
1 show association between algae and fungi.
2 grow faster thanothers.
3 are sensitive to $\text{S}{{\text{O}}_{2}}$.
4 flourish in $\text{S}{{\text{O}}_{2}}$ rich environment.
Explanation:
(c) Lichens are formed by symbiotic relationship between algae or cyanobacteria and fungi. Lichens typically grow in harsh environments most lichens, especially epiphytic fruticose species and those containing cyanobacteria, are sensitive to pollutants. Hence, they have been widely used as $\text{S}{{\text{O}}_{2}}$ pollution indicator organisms.
NCERT Page-27 / N-21
BIOLOGICAL CLASSIFICATION(NCERT)
285878
Which of the following are most suitable indicators of $\text{S}{{\text{O}}_{2}}$ pollution in the environment?
1 Conifers
2 Algae
3 Fungi
4 Lichens
Explanation:
(d) Lichens cannot grow in the place where sulpher dioxide, pollutant is available in the environment.
