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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.

According to the passage, when a few harmful chemicals combine, they can

Solution

✅ Correct Option: 3

Option 3: contribute to a syndrome called Multiple Chemical Sensitivity is correct.

The passage tells us that when a few harmful chemicals combine (mix together), they can lead to a condition called Multiple Chemical Sensitivity (MCS). This is a syndrome (a group of health problems that happen together) where a person's body becomes very sensitive to chemicals, even in tiny amounts. For example, someone with MCS might feel dizzy, get headaches, or feel sick just from smelling cleaning products or paint.

Why the other options are wrong:

Option 1 – The passage does not say that combining harmful chemicals causes allergies. Allergies are reactions to things like dust or pollen, which is different.

Option 2 – "A monumental task for homeowners" may appear in the passage, but it describes something else — not the result of chemicals mixing together.

Option 4 – Photosynthesis is how plants make food from sunlight. It has nothing to do with harmful chemicals combining.

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