TLS Online TPP Program

#Question id: 5669


What is the reproductive difference between sea urchins and mammals is?

#Unit 5. Developmental Biology
  1. The sea urchin egg completes meiosis prior to fertilization, but meiosis in mammals is completed after fertilization

  2. Sea urchin eggs and sperm are of equal size, but human eggs are much bigger than mammal’s sperm

  3. Sea urchins, but not mammals, have a need to block polyspermy, because only in sea urchins can there be more than one source of sperm to fertilize the eggs

  4. Sea urchin zygotes get their mitochondria from the sperm, but mammals zygote get their mitochondria from the egg.

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TLS Online TPP Program

#Question id: 9601

#Unit 9. Diversity of Life Forms

The relative lengths of the frog and mouse branches in the phylogenetic tree indicate that

TLS Online TPP Program

#Question id: 9600

#Unit 9. Diversity of Life Forms

 Based on the tree below, which statement is not correct?

TLS Online TPP Program

#Question id: 11403

#Unit 10. Ecological Principles

Several categories of risk of species extinction have been defined. A species can be determined as critical endangered if there is considered to be

TLS Online TPP Program

#Question id: 11404

#Unit 10. Ecological Principles

You were discovered 4 species in forest, their characteristic as following,

A specie eat only bamboo;

B species eat fruits of many tree species;

C species Short life span;

D species low population variability .

Which of the following species characteristics have been proposed as more prone to extinct?

TLS Online TPP Program

#Question id: 11405

#Unit 10. Ecological Principles

Vulnerability to extinction can be linked to species following characteristics. Which of the following statement are correct?

A. Endemism species are more prone to extinction than fragmented

B. Species that are capable of migrating between fragments of habitat, such as between mainland areas and islands, may be more resistant to extinction

C. Population variability species are less prone to extinct

D. Species with naturally long life spans may be more likely to become extinct

TLS Online TPP Program

#Question id: 11406

#Unit 10. Ecological Principles

Which of the following is true for a critically endangered species?