Estimates of current rates of extinction -triyambak.org

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#Question id: 12576

Estimates of current rates of extinction

#Unit 10. Ecological Principles

Indicate that we have reached a state of stable equilibrium in which speciation and extinction rates are approximately equal.
Suggest that one-half of all animal and plant species may be gone by the year 2100.
Indicate that rates may be greater than the mass extinctions at the close of the Cretaceous period.
Indicate that only 1% of all of the species that have ever lived on Earth are still alive.

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#Question id: 28450

#Unit 5. Developmental Biology

Each member of equivalence group is_____?________to become induced by the anchor cell

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#Question id: 28451

#Unit 5. Developmental Biology

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

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#Question id: 28452

#Unit 5. Developmental Biology

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

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#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 ?

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#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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