Questions

Here ‘passed each other’ means crossed each other’s path. No preposition is required by ‘passed’.

The purpose of hydrogenating unsaturated fats is to make them more solid at room temperature as it is easy store the product.

Anaerobic glycolysis is the transformation of glucose to lactate when limited amounts of oxygen (O2) are available. 

Hence, Anaerobic glycolysis occurs without oxygen.

Secondary succession means in an ecosystem renewal of itself after all or a portion has been destroyed.

After a forest fire, the whole forest had destroyed but after that again renewal of that forest is also an example of secondary succession.

The data bus is Bi-directional because the same bus is used for transfer of data between Micro Processor and momory of input / output devices in both the direction.

Tropical cyclones are also known as 'typhoons' in china, and Willy Willies in Australia.

A trampoline is a sheet or web supported by springs in a metal frame and is used as spring board.