The pineal gland produces melatonin, a hormone that regulates sleep. R

Question

The pineal gland produces melatonin, a hormone that regulates sleep. Reduced levels of light—most critically, reduced levels of blue light—signal the pineal gland to begin producing melatonin. In the past, the production of melatonin would start at dusk, peak in the middle of the night, and then taper off near dawn. Today, the nighttime use of cell phones, tablets, and computers whose screens emit blue light, has changed the timing of melatonin production, and sleep patterns have been adversely affected. Furthermore, smaller screens viewed at closer range intensify the adverse effects. In a recent study of the nighttime use of screen-based devices by 10,000 teenagers, researchers concluded that the longer the teens viewed their screens before going to bed, the longer they took to fall asleep after going to bed. Thus, the study showed that as the ____1____ increased, the ____2____ increased.

Select for 1 and for 2 the phrases that create the statement that most logically completes the passage. Make only two selections, one in each column.

Select for 1 and for 2 the phrases that create the statement that most logically completes the passage. Make only two selections, one in each column.

GmatTest2026 · Answer

Solution:

The study showed that as the    length of time the teens spent viewing their screens before going to bed    i ncreased,   the delay in melatonin production after the teens went to bed.

As mentioned in the highlighted portion that how does the sleep pattern get affected by the blue light emitted by the use of cell phones, tablets, and computers, and how has it changed the timing of melatonin production?

Abhiswarup · Answer

The passage explains the importance of melatonin and how it used to be produced in humans earlier. It also explains that blue light tends to reduce the production of melatonin and present use of computers, mobile, etc which emits blue light have adversely affected the sleep pattern.

Thus, going with the passage argument the conclusion of the passage shall be, the study showed that as the length of time the teens spent viewing their screens before going to bed increased, the delay in melatonin production after the teens went to bed increased.

BD is the answer.

Bismuth83 · Answer

1. The question asks us to  find two variables so that, based on the text, when one is increased the other is also increased .

2. This is a simples cause and effect. The text highlights this here, "researchers concluded that the longer the teens viewed their screens before going to bed, the longer they took to fall asleep after going to bed."

3. The cause would then be teens viewing their screens for longer, or increasing the length of time the teens spent viewing their screens before going to bed. The effect is taking longer for the teens to fall asleep, or increasing the delay in melatonin production after the teens went to bed.

4. Our answer will be:   1 - length of time the teens spent viewing their screens before going to bed and 2 - delay in melatonin production after the teens went to bed.

bumpbot · Answer

Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

This post was generated automatically.

1	2
		size of the screens the teens viewed
		length of time the teens spent viewing their screens before going to bed
		use of apps to control the amount of blue light emitted by their screens
		delay in melatonin production after the teens went to bed
		distance from which the teens viewed their screens

The pineal gland produces melatonin, a hormone that regulates sleep. R

Prep Toolkit

Top 5 GMAT Debrief Videos

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards

GMAT Two-part Analysis (TPA) Questions

The pineal gland produces melatonin, a hormone that regulates sleep. R

Prep Toolkit

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards