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David Tilman's long term ecosystem exper...

David Tilman's long term ecosystem experiments using outdoor plots provide some tentative answers regarding `:`

A

the importance of biodiversity to the ecosystem

B

ecosystem extinctions

C

ecosystem distribution

D

relationship of biodiversity and area

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David Tilman's long-term ecosystem experiments using outdoor plots showed that

Identify the ecologist from the given hints (i) He carried out long term ecosystem experiments using outdoor plots (ii) In his experiments he showed that "increased diversity contributed to higher productivity".

Match column I with column II and select the correct option from the given codes. {:("Column I",,"Column II"),("A) Rivet Popper hypothesis",(i),"Paul Ehrlich"),("B) Long-term ecosystem experiments using outdoor plots",(ii),"David Tilman"),("C) Species-area relationships",(iii),"Alexander von Humboldt"):} (a) A-(iii), B-(i), C-(ii) (b) A-(i), (ii), C-(iii) (c) A-(i), B-(iii), C-(ii) (d) A-(ii), B-(iii), C-(i)

The existence of negatively charged particle in an atom was shown by J.J. Thomson as a result of the studies of the passage of electricity through gases at extremely low pressure known as discharge tube experiments. When a high voltage of the order of 10,000 volts or more was impressed across the electrodes, some sort of invisible rays moved from the negative electrode to the positive electrode these rays are called as cathode rays. Cathode rays travel in straight path in absence of electrical and magnetic field . Cathode rays consist of material part and charged particles? Cathode rays produce X-rays and light is emitted when they strike on ZnS screen. Cathode rays penetrate through thin sheets of aluminium and other metals . They affect the photogenic plate and passes heating effect when they strike on metal foil. The raito of charge to mass i.e charge/mass is same for all the cathode rays irrespective of the gas used in the tube. The existence of positively charged particle in an atom was shown be E. Goldstein. He repeated the same discharge tube experiments by using a perforated cathode. It was observed that when a high potential difference was applied between the electrodes, not only cathode rays were produced but also a new type of rays were produced simultaneoulsy from anode moving towards cathode and passes through the holes or canal of the cathode. These termed as canal rays or anode rays. These rays travel in straight lines and consists of positively charged particles. These rays have kinetic energy and produces heating effect also. The e/m ratio of these rays is smaller than that of electrons. Unlike cathode rays, their e/m value is dependent upon the nature of the gas taken in the tube. These rays produced flashes of light on ZnS screen and can pass throughs thin metal foils. They can produce physical and chemical changes and are capable to produce ionisation in gases. For cathode rays the value of e/m:

The existence of negatively charged particle in an atom was shown by J.J. Thomson as a result of the studies of the passage of electricity through gases at extremely low pressure known as discharge tube experiments. When a high voltage of the order of 10,000 volts or more was impressed across the electrodes, some sort of invisible rays moved from the negative electrode to the positive electrode these rays are called as cathode rays. Cathode rays travel in straight path in absence of electrical and magnetic field . Cathode rays consist of material part and charged particles? Cathode rays produce X-rays and light is emitted when they strike on ZnS screen. Cathode rays penetrate through thin sheets of aluminium and other metals . They affect the photogenic plate and passes heating effect when they strike on metal foil. The raito of charge to mass i.e charge/mass is same for all the cathode rays irrespective of the gas used in the tube. The existence of positively charged particle in an atom was shown be E. Goldstein. He repeated the same discharge tube experiments by using a perforated cathode. It was observed that when a high potential difference was applied between the electrodes, not only cathode rays were produced but also a new type of rays were produced simultaneoulsy from anode moving towards cathode and passes through the holes or canal of the cathode. These termed as canal rays or anode rays. These rays travel in straight lines and consists of positively charged particles. These rays have kinetic energy and produces heating effect also. The e/m ratio of these rays is smaller than that of electrons. Unlike cathode rays, their e/m value is dependent upon the nature of the gas taken in the tube. These rays produced flashes of light on ZnS screen and can pass throughs thin metal foils. They can produce physical and chemical changes and are capable to produce ionisation in gases. Which is not true with respect to cathode rays?

The existence of negatively charged particle in an atom was shown by J.J. Thomson as a result of the studies of the passage of electricity through gases at extremely low pressure known as discharge tube experiments. When a high voltage of the order of 10,000 volts or more was impressed across the electrodes, some sort of invisible rays moved from the negative electrode to the positive electrode these rays are called as cathode rays. Cathode rays travel in straight path in absence of electrical and magnetic field . Cathode rays consist of material part and charged particles? Cathode rays produce X-rays and light is emitted when they strike on ZnS screen. Cathode rays penetrate through thin sheets of aluminium and other metals . They affect the photogenic plate and passes heating effect when they strike on metal foil. The raito of charge to mass i.e charge/mass is same for all the cathode rays irrespective of the gas used in the tube. The existence of positively charged particle in an atom was shown be E. Goldstein. He repeated the same discharge tube experiments by using a perforated cathode. It was observed that when a high potential difference was applied between the electrodes, not only cathode rays were produced but also a new type of rays were produced simultaneoulsy from anode moving towards cathode and passes through the holes or canal of the cathode. These termed as canal rays or anode rays. These rays travel in straight lines and consists of positively charged particles. These rays have kinetic energy and produces heating effect also. The e/m ratio of these rays is smaller than that of electrons. Unlike cathode rays, their e/m value is dependent upon the nature of the gas taken in the tube. These rays produced flashes of light on ZnS screen and can pass throughs thin metal foils. They can produce physical and chemical changes and are capable to produce ionisation in gases. Select the incorrect statement.

Green algae are also included among the items carried by astronauts in a space ship Which of the following are the reasons for this? 1. These being very simple plants, are amenable to a variety of experiments. 2. These may provide nourishment to the persons on the space ship. 3. These act as a source of oxygen. Select the correct answer using the codes given below.

Read the given statements and select the correct option regarding this. (i) Ecosystem services provided by nature to human beings such as oxygen for respiration, asesthetic value, etc. (ii) Direct economic benefits derived from nature by human beings such as food, medicine, etc. (iii) Every species has an intrinsic value, even if it is not of any economic use to us. With respect to above give codes (i), (ii) and (iii) choose the correct option.

An unmanned satellite A and a spacecraft B are orbiting around the earth in the same circular orbit as shown. The spacecraft is ahead of the satellite by some time. Let us consider that some technical problem has arisen in the satellite and the astronaut from B has made it correct. For this to be done docking of two ( A and B ) is required (in layman terms connecting A and B ). To achieve this, the rockets of A have been fired in forward direction and docking takes place as shown in the figure below: Take mass of the earth =5.98xx10^(24)kg Radius of the earth =6400 km Orbital radius =9600km Mass of satellite A=320 kg Mass of spacecraft =3200 kg Assume that initially spacecraft B leads satellite A by 100s , i.e., A arrives at any particle position after 100 s of B’s arrival. Based on the above information answer the following questions. After once returning to the original point, i.e., the place from where the rockets have been fired, in which direction and with what extent the rockets have to be fired from the satellite to again come back in the original orbit?

VMC MODULES ENGLISH-ECOSYSTEM-IMPECCABLE
  1. David Tilman's long term ecosystem experiments using outdoor plots pro...

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  2. Which one of the following ecosystem types has the highest annual net ...

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  3. Stability of ecosystem depends upon:

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  4. Pyramid of energy in an aquatic ecosystem is

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  5. Term 'ecosystem' was coined by

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  6. which ecosystem has the highest primary productivity ?

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  7. About 70% of total global carbon is found in :

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  8. Consider the following statements concerning food chain : ( a) remov...

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  9. Which of the following ecosystem has the highest gross primary product...

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  10. Which of the following is considered as pioneer community is xerarch?

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  11. The final stable community in ecological succession is:

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  12. Which one of the following types of organisms occupy more than one tro...

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  13. In plant succession, when climax community is reached, the net product...

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  14. If a single plant species is removed from a food web then most likely

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  15. The assemblage of all the population of different species that functio...

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  16. The correct sequence of plants in a hydrosere is

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  17. The biomass available for consumption by the herbivores and the decomp...

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  18. Study the cycle shown in Fig. 12.7 and select the option which gives c...

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  19. Which one of the following is one of the characteristics of a biologi...

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  20. The plants convert light into chemical energy with a photosynthetic ef...

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  21. The 10% law of energy transfer in food chains was given by :

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