Which one among the following hormones stimulates the plant cells to grow in a manner such that the plant appears to be bent towards light?

The main thinking part of the brain is

Which one among the following diseases is not caused by polluted water?

Muscles of which one among the following body parts contract slowly but can remain contracted for a longer time?

Which one among the following animals gives birth to the biggest baby?

Which one among the following substances is never excreted out through urine under normal circumstances in any healthy individual?