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During the bleak winter months, when gardens lie dormant, and trees are bare, the vibrant green of houseplants can be a soothing balm for our spirits. Many people visit garden stores to reconnect with nature and breathe in the freshness that reminds them of spring.

With growing awareness about the harmful chemicals we introduce into our homes, like those from dry cleaning and various cleaners, there's an increasing need for plants that can improve indoor air quality. Many household products release chemicals such as formaldehyde, chlorine, and benzene, which can mimic allergy symptoms during winter when windows are shut. This reaction may stem from Multiple Chemical Sensitivity. Fortunately, research shows that certain houseplants can help filter these harmful substances, promoting a healthier living environment.
Ferns and palms are effective at removing chemicals from the air in homes. They release moisture during photosynthesis, drawing pollutants into their leaves. NASA has even found that palms can eliminate traces of formaldehyde quickly in controlled environments. Both plants are ancient, over a hundred million years old, and can live for 100 years or more. Their longevity and ability to grow tall (up to 65 feet) may enhance their environmental purifying qualities.

What is the main idea of the passage?

Solution

✅ Correct Option: 4

Option 4: Certain plants can purify the home of many harmful chemicals → Correct ✅

The main idea is the "big umbrella" message that covers everything in the passage. Here, the passage talks about how specific plants act like natural air cleaners by removing harmful chemicals from our homes. This option captures both the problem (harmful chemicals) and the solution (certain plants that purify the air).

Let's confirm by checking why the other options don't work:

Option 1 → Only mentions the problem (contaminants) but ignores the solution (plants that clean the air). Too incomplete to be the main idea.

Option 2 → Too vague. The passage doesn't talk about any plant — it focuses on certain plants that help clean the air.

Option 3 → Releasing moisture is just a small detail, not the big picture of the passage.

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