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#Question id: 12755

Which of the following statements best describes why biologists are currently concerned with global warming and the thawing of permafrost in many areas of the tundra biome?

#Unit 10. Ecological Principles

The thawing process will likely decrease the abundance and diversity of soil-dwelling organisms in tundra habitats.
The bacterial decomposition of the thawed organic materials on the widespread areas of the tundra will produce large quantities of CO2, which will add to greenhouse gases and exacerbate global warming.
Oil and coal deposits will thaw and rise to the surface (because of their lower density) of the tundra, destroying millions of acres of arctic habitat.
Populations of humans inhabiting the arctic will have to move to more southern latitudes, resulting in in- creased competition for resources in already densely populated areas.

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TLS Online TPP Program

#Question id: 28451

#Unit 5. Developmental Biology

Which of the following cell divide to form the central vulval cells?

TLS Online TPP Program

#Question id: 28452

#Unit 5. Developmental Biology

Which of the following cell divide to form the lateral vulval cells?

TLS Online TPP Program

#Question id: 28453

#Unit 5. Developmental Biology

The cells which donot receive any signals from the anchor cell because these cell farther away from anchor cells that involve to generate which type of cell by default ?

TLS Online TPP Program

#Question id: 28454

#Unit 5. Developmental Biology

A researcher performed an experiment during vulva formation in C.elegans;

I- In first experiment destroyed anchor cell

II- In second experiment destroyed three central VPCs

What kind of conclusion has been drawn by these experiments?

a) I-Three cells out of six of the equivalence group divide once and contribute to the vulva formation

b) I-all six cells of the equivalence group divide once and contribute to the hypodermal tissue

c) II-three outer cells, which normally form hypodermis, generate vulval cells instead

d) II-three remaining cells normally formed hypodermis as usually

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