What does the word “filters out” in paragraph 1 probably mean?

The writer learnt to sail ................. 

It can be inferred from the passage that the sounds produced by the trees ...............

Why does the author mention Lady Gaga?

What is the meaning of “waterproof” in the second paragraph?

It can be inferred from the passage that John Adams was:

Who opposed the bill that was introduced in the House of Commons in the early 1900s?

What happened when the writer's father came?

According to the text, the most important quality of a teacher is _______.

The word it refers to___________. 

Orchids are unique in having the most highly developed of all blossoms, in which the usual male and female reproductive organs are fused in a single structure called the column. The column is designed so that a single pollination will fertilize hundreds of thousands, and in some cases millions, of seeds, so microscopic and light they are easily carried by the breeze. Surrounding the column are three sepals and three petals, sometimes easily recognizable as such, often distorted into gorgeous, weird, but always functional shapes. The most noticeable of the petals is called the labellum, or lip. It is often dramatically marked as an unmistakable landing strip to attract the specific insect the orchid has chosen as its pollinator. To lure their pollinators from afar, orchids use appropriately intriguing shapes, colors, and scents. At least 50 different aromatic compounds have been analyzed in the orchid family, each blended to attract one, or at most a few, species of insects or birds. Some orchids even change their scents to interest different insects at different times. Once the right insect has been attracted, some orchids present all sorts of one-way obstacle courses to make sure it does not leave until pollen has been accurately placed or removed. By such ingenious adaptations to specific pollinators, orchids have avoided the hazards of rampant crossbreeding in the wild, assuring the survival of species as discrete identities. At the same time they have made themselves irresistible to collectors.

What does the passage mainly discuss?