TLS Online TPP Program

#Question id: 11204


Why do Na+ ions enter the cell when voltage-gated Na+ channels are opened in neurons?

#Part-A Aptitude & General Biotechnology
  1. because the Na+ concentration is much lower outside the cell than it is inside

  2. because the Na+ ions are actively transported by the sodium-potassium pump into the cell
  3. because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are attracted to the negatively charged interior

  4. because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions are actively transported by the sodium-potassium pump into the cell

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TLS Online TPP Program

#Question id: 10882

#Part-B Specialized Branches in Biotechnology

The difference between net and gross primary productivity would likely be greatest for

TLS Online TPP Program

#Question id: 10883

#Part-B Specialized Branches in Biotechnology

Ecosystem having a three trophic level in which number of species is given in table


 Total 50 number of link among these trophic levels present. What is value of connectance in ecosystem? 

TLS Online TPP Program

#Question id: 10884

#Part-B Specialized Branches in Biotechnology

Herbivore ingests plant material with 1000 k j energy form producer and 300 kJ loss as feces waste; additionally herbivore invests 300 k j energy in respiration. What is production efficiency of that herbivore?

TLS Online TPP Program

#Question id: 10885

#Part-B Specialized Branches in Biotechnology

In a field experiment, autotrophs are provided a 14C-labelled carbon compound for photosynthesis. Radioactivity (14C) levels were then monitored at regular intervals in all the trophic levels. In which ecosystem is the radioactivity likely to be detected in longer time at the higher trophic level?

TLS Online TPP Program

#Question id: 10886

#Part-B Specialized Branches in Biotechnology

Much greater proportion of energy fixed by autotrophs is transferred to the herbivore level in the open ocean ecosystem than in a forest ecosystem because

TLS Online TPP Program

#Question id: 10887

#Part-B Specialized Branches in Biotechnology

What is a linkage density of community A and B RESPECTIVELY?