18288 + Interview Questions in Biology Page 104 InterviewSolution

5151.	Cultivation of a single crop on a given tract of land leads eventually to decreased yields. One reason for this is that harmful bacterial phytopathogens, organisms parasitic on plant hosts, increase in the soil surrounding plant roots. The problem can be cured by crop rotation, denying the pathogens a suitable host for a period of time. However, even if crops are not rotated, the severity of diseases brought on by such phytopathogens often decreases after a number of years as the microbial population of the soil changes and the soil becomes “suppressive” to those diseases. While there may be many reasons for this phenomenon, it is clear that levels of certain bacteria, such as Pseudomonas fluorescens, a bacterium antagonistic to a number of harmful phytopathogens, are greater in suppressive than in nonsuppressive soil. This suggests that the presence of such bacteria suppresses phytopathogens. There is now considerable experimental support for this view. Wheat yield increases of 27 percent have been obtained in field trials by treatment of wheat seeds with fluorescent pseudomonads. Similar treatment of sugar beets, cotton, and potatoes has had similar results. These improvements in crop yields through the application of Pseudomonas fluorescens suggest that agriculture could benefit from the use of bacteria genetically altered for specific purposes. For example, a form of phytopathogen altered to remove its harmful properties could be released into the environment in quantities favorable to its competing with and eventually excluding the harmful normal strain. Some experiments suggest that deliberately releasing altered nonpathogenic Pseudomonas syringae could crowd out (crowd out: the nonaltered variety that causes frost damage. Opponents of such research have objected that the deliberate and large-scale release of genetically altered bacteria might have deleterious results. Proponents, on the other hand, argue that this particular strain is altered only by the removal of the gene responsible for the strain’s propensity to cause frost damage, thereby rendering it safer than the phytopathogen from which it was derived. Some proponents have gone further and suggest that genetic alteration techniques could create organisms with totally new combinations of desirable traits not found in nature. For example, genes responsible for production of insecticidal compounds have been transposed from other bacteria into pseudomonads that colonize corn roots. Experiments of this kind are difficult and require great care: such bacteria are developed in highly artificial environments and may not compete well with natural soil bacteria. Nevertheless, proponents contend that the prospects for improved agriculture through such methods seem excellent. These prospects lead many to hope that current efforts to assess the risks of deliberate release of altered microorganisms will successfully answer the concerns of opponents and create a climate in which such research can go forward without undue impediment. Q26. Which one of the following best summarizes the main idea of the passage?
Answer» Cultivation of a single crop on a given tract of land leads eventually to decreased yields. One reason for this is that harmful bacterial phytopathogens, organisms parasitic on plant hosts, increase in the soil surrounding plant roots. The problem can be cured by crop rotation, denying the pathogens a suitable host for a period of time. However, even if crops are not rotated, the severity of diseases brought on by such phytopathogens often decreases after a number of years as the microbial population of the soil changes and the soil becomes “suppressive” to those diseases. While there may be many reasons for this phenomenon, it is clear that levels of certain bacteria, such as Pseudomonas fluorescens, a bacterium antagonistic to a number of harmful phytopathogens, are greater in suppressive than in nonsuppressive soil. This suggests that the presence of such bacteria suppresses phytopathogens. There is now considerable experimental support for this view. Wheat yield increases of 27 percent have been obtained in field trials by treatment of wheat seeds with fluorescent pseudomonads. Similar treatment of sugar beets, cotton, and potatoes has had similar results. These improvements in crop yields through the application of Pseudomonas fluorescens suggest that agriculture could benefit from the use of bacteria genetically altered for specific purposes. For example, a form of phytopathogen altered to remove its harmful properties could be released into the environment in quantities favorable to its competing with and eventually excluding the harmful normal strain. Some experiments suggest that deliberately releasing altered nonpathogenic Pseudomonas syringae could crowd out (crowd out: the nonaltered variety that causes frost damage. Opponents of such research have objected that the deliberate and large-scale release of genetically altered bacteria might have deleterious results. Proponents, on the other hand, argue that this particular strain is altered only by the removal of the gene responsible for the strain’s propensity to cause frost damage, thereby rendering it safer than the phytopathogen from which it was derived. Some proponents have gone further and suggest that genetic alteration techniques could create organisms with totally new combinations of desirable traits not found in nature. For example, genes responsible for production of insecticidal compounds have been transposed from other bacteria into pseudomonads that colonize corn roots. Experiments of this kind are difficult and require great care: such bacteria are developed in highly artificial environments and may not compete well with natural soil bacteria. Nevertheless, proponents contend that the prospects for improved agriculture through such methods seem excellent. These prospects lead many to hope that current efforts to assess the risks of deliberate release of altered microorganisms will successfully answer the concerns of opponents and create a climate in which such research can go forward without undue impediment. Q26. Which one of the following best summarizes the main idea of the passage?

5151.

Cultivation of a single crop on a given tract of land leads eventually to decreased yields. One reason for this is that harmful bacterial phytopathogens, organisms parasitic on plant hosts, increase in the soil surrounding plant roots. The problem can be cured by crop rotation, denying the pathogens a suitable host for a period of time. However, even if crops are not rotated, the severity of diseases brought on by such phytopathogens often decreases after a number of years as the microbial population of the soil changes and the soil becomes “suppressive” to those diseases. While there may be many reasons for this phenomenon, it is clear that levels of certain bacteria, such as Pseudomonas fluorescens, a bacterium antagonistic to a number of harmful phytopathogens, are greater in suppressive than in nonsuppressive soil. This suggests that the presence of such bacteria suppresses phytopathogens. There is now considerable experimental support for this view. Wheat yield increases of 27 percent have been obtained in field trials by treatment of wheat seeds with fluorescent pseudomonads. Similar treatment of sugar beets, cotton, and potatoes has had similar results. These improvements in crop yields through the application of Pseudomonas fluorescens suggest that agriculture could benefit from the use of bacteria genetically altered for specific purposes. For example, a form of phytopathogen altered to remove its harmful properties could be released into the environment in quantities favorable to its competing with and eventually excluding the harmful normal strain. Some experiments suggest that deliberately releasing altered nonpathogenic Pseudomonas syringae could crowd out (crowd out: the nonaltered variety that causes frost damage. Opponents of such research have objected that the deliberate and large-scale release of genetically altered bacteria might have deleterious results. Proponents, on the other hand, argue that this particular strain is altered only by the removal of the gene responsible for the strain’s propensity to cause frost damage, thereby rendering it safer than the phytopathogen from which it was derived. Some proponents have gone further and suggest that genetic alteration techniques could create organisms with totally new combinations of desirable traits not found in nature. For example, genes responsible for production of insecticidal compounds have been transposed from other bacteria into pseudomonads that colonize corn roots. Experiments of this kind are difficult and require great care: such bacteria are developed in highly artificial environments and may not compete well with natural soil bacteria. Nevertheless, proponents contend that the prospects for improved agriculture through such methods seem excellent. These prospects lead many to hope that current efforts to assess the risks of deliberate release of altered microorganisms will successfully answer the concerns of opponents and create a climate in which such research can go forward without undue impediment. Q26. Which one of the following best summarizes the main idea of the passage?

Answer»

Cultivation of a single crop on a given tract of land leads eventually to decreased yields. One reason for this is that harmful bacterial phytopathogens, organisms parasitic on plant hosts, increase in the soil surrounding plant roots. The problem can be cured by crop rotation, denying the pathogens a suitable host for a period of time. However, even if crops are not rotated, the severity of diseases brought on by such phytopathogens often decreases after a number of years as the microbial population of the soil changes and the soil becomes “suppressive” to those diseases. While there may be many reasons for this phenomenon, it is clear that levels of certain bacteria, such as Pseudomonas fluorescens, a bacterium antagonistic to a number of harmful phytopathogens, are greater in suppressive than in nonsuppressive soil. This suggests that the presence of such bacteria suppresses phytopathogens. There is now considerable experimental support for this view. Wheat yield increases of 27 percent have been obtained in field trials by treatment of wheat seeds with fluorescent pseudomonads. Similar treatment of sugar beets, cotton, and potatoes has had similar results.

These improvements in crop yields through the application of Pseudomonas fluorescens suggest that agriculture could benefit from the use of bacteria genetically altered for specific purposes. For example, a form of phytopathogen altered to remove its harmful properties could be released into the environment in quantities favorable to its competing with and eventually excluding the harmful normal strain. Some experiments suggest that deliberately releasing altered nonpathogenic Pseudomonas syringae could crowd out (crowd out: the nonaltered variety that causes frost damage. Opponents of such research have objected that the deliberate and large-scale release of genetically altered bacteria might have deleterious results. Proponents, on the other hand, argue that this particular strain is altered only by the removal of the gene responsible for the strain’s propensity to cause frost damage, thereby rendering it safer than the phytopathogen from which it was derived.

Some proponents have gone further and suggest that genetic alteration techniques could create organisms with totally new combinations of desirable traits not found in nature. For example, genes responsible for production of insecticidal compounds have been transposed from other bacteria into pseudomonads that colonize corn roots. Experiments of this kind are difficult and require great care: such bacteria are developed in highly artificial environments and may not compete well with natural soil bacteria. Nevertheless, proponents contend that the prospects for improved agriculture through such methods seem excellent. These prospects lead many to hope that current efforts to assess the risks of deliberate release of altered microorganisms will successfully answer the concerns of opponents and create a climate in which such research can go forward without undue impediment.

Q26. Which one of the following best summarizes the main idea of the passage?

5152.	Which of the following are responsible for refraction and focusing?
Answer» Which of the following are responsible for refraction and focusing?

5153.	In myasthenia gravis acetylcholine:
Answer» In myasthenia gravis acetylcholine:

5154.	Write down one drawback of artificial system of classification.
Answer» Write down one drawback of artificial system of classification.

5155.	what are the naked uninucleate structures formed in zoosporangia
Answer» what are the naked uninucleate structures formed in zoosporangia

5156.	What are the advantages of converting bio mass into bio gas?
Answer» What are the advantages of converting bio mass into bio gas?

5157.	The _____ represent the cracks in bone tissue that directly supply nutrients to the osteocytes.
Answer» The _____ represent the cracks in bone tissue that directly supply nutrients to the osteocytes.

5158.	Have you ever wondered why siblings sometimes look so similar to each other? Or sometimes even so different?
Answer» Have you ever wondered why siblings sometimes look so similar to each other? Or sometimes even so different?

5159.	Wild Ti plasmid is able induce tumors in plants due to presence of
Answer» Wild Ti plasmid is able induce tumors in plants due to presence of

5162.	What are the difficulties that you would face in the classification of animals if common fundamental features are not taken into account?
Answer» What are the difficulties that you would face in the classification of animals if common fundamental features are not taken into account?

5163.	Given below is an incomplete table on certain hormones, their source glands and one major effect of each on the body in humans. Identify the correct option for the three blanks A, B and C. GlandsSecretionEffect on BodyAOestrogenMaintenance of secondary sexual charactersAlpha cells of Islets of LangerhansBRaises blood sugar levelAnterior pituitaryCOver secretion leads to gigantismVisual pigmentIodopsinRhodopsin
Answer» Given below is an incomplete table on certain hormones, their source glands and one major effect of each on the body in humans. Identify the correct option for the three blanks A, B and C. $\begin{matrix} G l a n d s & S e c r e t i o n & E f f e c t o n B o d y A & O e s t r o g e n & M a i n t e n a n c e o f s e c o n d a r y s e x u a l c h a r a c t e r s A l p h a c e l l s o f I s l e t s o f L a n g e r h a n s & B & R a i s e s b l o o d s u g a r l e v e l A n t e r i o r p i t u i t a r y & C & O v e r s e c r e t i o n l e a d s t o g i g a n t i s m V i s u a l p i g m e n t & I o d o p s i n & R h o d o p s i n \end{matrix}$

5164.	Question 10 Which is not a function of epidermis? (a) Protection from adverse condition (b) Gaseous exchange (c) Conduction of water (d) Transpiration
Answer» Question 10 Which is not a function of epidermis? (a) Protection from adverse condition (b) Gaseous exchange (c) Conduction of water (d) Transpiration

5165.	Cyclosporin A used as immunosuppressive agent is obtained from
Answer» Cyclosporin A used as immunosuppressive agent is obtained from

5166.	Natural parthenogenesis is found in
Answer» Natural parthenogenesis is found in

5167.	Veins do not require thick walls
Answer» Veins do not require thick walls

5168.	what are key events in telphase 1 anaphase 1 metaphase 1 give diagram for the same plesase
Answer» what are key events in telphase 1 anaphase 1 metaphase 1 give diagram for the same plesase

5169.	Which of the following is not an insect?
Answer» Which of the following is not an insect?

5170.	In which particular location phloem occur in bicollateralvascular bundles?
Answer» In which particular location phloem occur in bicollateral vascular bundles?

5171.	Q. Why do we use glucose as our energy resource and not fructose?
Answer» Q. Why do we use glucose as our energy resource and not fructose?

5172.	Wings of birds and wings of flies are the examples of:
Answer» Wings of birds and wings of flies are the examples of:

5173.	A cross is made between parents with genotype as AAbbCcDdEE * AaBBCcDDee. What will be the probability that their progeny will be complete heterozygote?
Answer» A cross is made between parents with genotype as AAbbCcDdEE * AaBBCcDDee. What will be the probability that their progeny will be complete heterozygote?

5175.	What is thylakoid explain with diagram
Answer» What is thylakoid explain with diagram

5176.	What is ment by gridling experiment?
Answer» What is ment by gridling experiment?

5177.	An exotic species that is introduced to a new area and spreads rapidly resulting in elimination of native species is called
Answer» An exotic species that is introduced to a new area and spreads rapidly resulting in elimination of native species is called

5178.	what will be the structure of isooc†an e?
Answer» what will be the structure of isooc†an e?

Explore topic-wise InterviewSolutions in .

Which of the following are responsible for refraction and focusing?

In myasthenia gravis acetylcholine:

Write down one drawback of artificial system of classification.

what are the naked uninucleate structures formed in zoosporangia

What are the advantages of converting bio mass into bio gas?

The _____ represent the cracks in bone tissue that directly supply nutrients to the osteocytes.

Have you ever wondered why siblings sometimes look so similar to each other? Or sometimes even so different?

Wild Ti plasmid is able induce tumors in plants due to presence of

Statement: Farmers must immediately switch over to organic fertilizers from chemical fertilizers for better yield. Assumptions: I. All the farmers use only chemical fertilizers. II. Organic fertilizers are readily available to the farmers.

Identify the microbe.

What are the difficulties that you would face in the classification of animals if common fundamental features are not taken into account?

Question 10 Which is not a function of epidermis? (a) Protection from adverse condition (b) Gaseous exchange (c) Conduction of water (d) Transpiration

Cyclosporin A used as immunosuppressive agent is obtained from

Natural parthenogenesis is found in

Veins do not require thick walls

what are key events in telphase 1 anaphase 1 metaphase 1 give diagram for the same plesase

Which of the following is not an insect?

In which particular location phloem occur in bicollateralvascular bundles?

Q. Why do we use glucose as our energy resource and not fructose?

Wings of birds and wings of flies are the examples of:

A cross is made between parents with genotype as AAbbCcDdEE * AaBBCcDDee. What will be the probability that their progeny will be complete heterozygote?

Diacetyl morphine is

What is thylakoid explain with diagram

What is ment by gridling experiment?

An exotic species that is introduced to a new area and spreads rapidly resulting in elimination of native species is called

what will be the structure of isooc†an e?

galvanic cell is set up from a zinc bar weighing 50g and1.Olitre, 1.0M, CuSO4 solution. How long would the cellrun, assuming it delivers a steady current of 1.0 ampere a)48 hrs b)41 hrs c)21 hrs d)1 h

The path of water from the soil in to the xylem of the root is:

Which one of the following plant is LDP?

Which of the following is true for a pathogen.

Question 25Make a list of conventional and non-conventional sources of energy. Give a brief description of harnessing one non-conventional source of energy.

If a diploid cell is arrested in Anaphase I and Anaphase II than what is correct for the stages respectively :-(1) 2n,4c and 2n,2c(2) 2n,4c and n,2c(3) 2n,2c and n,2c(4) 4n,4c and 2n,2c

Sexual reproduction does not involve

1. Hybridization of SiO2

Vitamin B12 contains:

Two different species cannot live for long, duration in the same niche or habitat. This law is _________

What is the difference between Morula , blastula and blastocyst?

When an organ is transplanted and is rejected by the body, the lymphocytes produced are

A child with blood group genotype IAIB is born to a woman with genotype IBIB. The father could not be a man of genotype

ntStructure of H.I.V virus?n

the dipole moment of chlorobenzene is lower than that of cyclohexylchloride. give

Solution of domain of root of cos (cosx)

A non-proteinaceous enzyme is:

Floral formula of Solanaceae is

Buttress roots

why is there absence of embryogenesis in algae ?

how can oviparous animals lay unfertilized eggs??if they do so what is the fate of that egg whether it is fertilized or it leads to parthenogenesis?

Which one of the following growth regulators is known as ‘stress hormone’?Ethylene Abscisic acidIndole acetic acidGA3

5179.	galvanic cell is set up from a zinc bar weighing 50g and1.Olitre, 1.0M, CuSO4 solution. How long would the cellrun, assuming it delivers a steady current of 1.0 ampere a)48 hrs b)41 hrs c)21 hrs d)1 h
Answer» galvanic cell is set up from a zinc bar weighing 50g and1.Olitre, 1.0M, CuSO4 solution. How long would the cellrun, assuming it delivers a steady current of 1.0 ampere a)48 hrs b)41 hrs c)21 hrs d)1 h

5180.	The path of water from the soil in to the xylem of the root is:
Answer» The path of water from the soil in to the xylem of the root is:

5181.	Which one of the following plant is LDP?
Answer» Which one of the following plant is LDP?

5182.	Which of the following is true for a pathogen.
Answer» Which of the following is true for a pathogen.

5183.	Question 25Make a list of conventional and non-conventional sources of energy. Give a brief description of harnessing one non-conventional source of energy.
Answer» Question 25 Make a list of conventional and non-conventional sources of energy. Give a brief description of harnessing one non-conventional source of energy.

5184.	If a diploid cell is arrested in Anaphase I and Anaphase II than what is correct for the stages respectively :-(1) 2n,4c and 2n,2c(2) 2n,4c and n,2c(3) 2n,2c and n,2c(4) 4n,4c and 2n,2c
Answer» If a diploid cell is arrested in Anaphase I and Anaphase II than what is correct for the stages respectively :- (1) 2n,4c and 2n,2c (2) 2n,4c and n,2c (3) 2n,2c and n,2c (4) 4n,4c and 2n,2c

5185.	Sexual reproduction does not involve
Answer» Sexual reproduction does not involve

5186.	1. Hybridization of SiO2
Answer» 1. Hybridization of SiO2

5187.	Vitamin B12 contains:
Answer» Vitamin $B_{12}$ contains:

5188.	Two different species cannot live for long, duration in the same niche or habitat. This law is _________
Answer» Two different species cannot live for long, duration in the same niche or habitat. This law is _________