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TLS Online TPP Program

#Question id: 15297

 Which of the following statement is correct regarding mammalian cleavage?

#Unit 5. Developmental Biology
  1. In all mammalian embryos, the first cleavage is a normal meridional division; however, in the second cleavage, one of the two blastomeres divides equatorially and the other divides meridionally.
  2. Mammalian embryos increase exponentially from 2 to 4 to 8 cells, but frequently contain odd numbers of cells.
  3. Mammalian genome is inactivated during early cleavage and zygotically transcribed proteins are necessary for cleavage and development.
  4. Maternally encoded proteins can persist through most of the cleavage stages and play important roles in late stages of development.
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TLS Online TPP Program

#Question id: 12372

#Unit 10. Ecological Principles

In a particular case of secondary succession, three species of wild grass all invaded a field. By the second season, a  single species dominated the field. A possible factor in this secondary succession was
TLS Online TPP Program

#Question id: 12373

#Unit 10. Ecological Principles

You are most likely to observe primary succession in a terrestrial community when you visit a(n) 
TLS Online TPP Program

#Question id: 12374

#Unit 10. Ecological Principles

The process in which pioneer species colonize a bare substrate such as rock, sand, or glacial till is known as
TLS Online TPP Program

#Question id: 12375

#Unit 10. Ecological Principles

When lichens grow on bare rock, they may eventually accumulate enough organic material around them to supply the foothold for later rooted vegetation. These early pioneering lichens can be said to do what to the later arrivals?
TLS Online TPP Program

#Question id: 12376

#Unit 10. Ecological Principles

All of the following may be considered as sites for secondary succession EXCEPT
TLS Online TPP Program

#Question id: 12377

#Unit 10. Ecological Principles

The pattern of gap formation may influence species diversity.