TLS Online TPP Program

#Id: 10763

#XL - R Botany

Androecium

Each anther is usually bilobed and each lobe has two chambers, the pollen-sacs.

The pollen grains are produced in pollen-sacs. A sterile stamen is called staminode

TLS Online TPP Program

#Id: 10812

#XL - R Botany

TLS Online TPP Program

#Id: 8412

#XL - Q Biochemistry

Binding of Ca2+ ions to TN-C

triggers movement of TM to a new position on the filament, thereby exposing the myosin-binding sites on actin.

TLS Online TPP Program

#Id: 9400

#XL - T Zoology

Konrad Lorenz

TLS Online TPP Program

#Id: 9389

#XL - T Zoology

Male stickleback fish develop red colour on their ventral side in the breeding season and maintain territories. 

When a conspecific male intruder enters their territory, resident males perform an aggressive display. 

The ethologist Niko Tinbergen presented models of different shapes to territorial male stickleback fish. He found that models of any shape elicited aggressive displays, provided the ventral part of the models was coloured red.