The mode of fertilization in sea urchin being external, the egg and spermatozoa are released into the sea water.

TLS Online TPP Program

#Id: 5420

#Unit 7. System Physiology – Animal

Types of neurons Based on the number of processes that emanate from their cell body, neurons can be classified as unipolar, bipolar, and multipolar.

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#Id: 5785

#Unit 7. System Physiology – Animal

Process of concentrating the iodide in the cell is called iodide trapping

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#Id: 5375

#Unit 10. Ecological Principles

Mark-recapture technique can have drawbacks;

1. Some animals that have been marked may learn to avoid the traps. 
2. Recapture rates will then be low, resulting in an overestimate of population size.

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#Id: 3135

#Unit 7. System Physiology – Animal

Important quantitation of lung function can be gleaned from the displacement of air volume during inspiration and expiration.

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#Id: 1058

#Unit 5. Developmental Biology

The genes encoding Islet1, Tbx4, and Pitx1 are expressed in presumptive hindlimbs.