From NCERTAsked by Anonymous from Indianapolis, United States24 Oct 2026, 2:29 AM ISTUpdated
In one line
Some trees with thick leaves and dense branches are best for blocking sound.
Monoon longifolium — Species of flowering plant Ashoka trees, often planted along roads in India to reduce noise. Image: Wikipedia
The rule
Trees with dense, broad leaves and many branches can reduce noise by absorbing and blocking sound waves.
Let's understand it simply
Imagine you are standing behind a thick, leafy mango tree while someone is playing loud music on the other side. You will notice the sound is softer behind the tree. This is because the tree acts like a wall. Its leaves, branches, and trunk stop some of the sound from reaching you. The more leaves and branches a tree has, the better it can block or absorb sound.
How it works
Sound travels in waves through the air.
When these waves hit a tree, some of the sound is absorbed by the leaves and branches.
Some sound bounces off the tree and goes in another direction.
The thick trunk and dense leaves stop some sound from passing through.
The more layers (leaves, branches), the less sound gets through.
How trees block sound
Sound waves hit the tree.
Leaves and branches absorb some sound.
Some sound bounces away.
Dense trees stop more sound.
Where you see it in real life
Ashoka trees along busy roads → Their tall, dense leaves help reduce traffic noise.
Bamboo planted in a row near houses → Bamboo grows close together, forming a thick barrier that blocks sound.
Neem trees in parks → Their wide, leafy branches absorb sound from nearby streets.
Peepal trees around temples → Their large leaves and spreading branches help keep the area peaceful by reducing outside noise.
Eucalyptus trees on highways → These tall trees with dense foliage help cut down the noise from vehicles.
Why it matters
Reduces noise pollution near homes, schools, and hospitals.
Makes gardens and parks quieter and more relaxing.
Helps people sleep better in noisy areas.
Protects animals from loud sounds that can disturb them.
Common mistakes
Thinking any tree will block sound: Thin or small trees do not work as well as dense, leafy ones.
Planting trees far apart: Gaps let sound through. Trees should be close together.
Choosing only short trees: Tall trees with thick branches block more noise.
Remember it
"Thick, leafy, and close together — the best trees for blocking noise!"
Check yourself
Why are trees with many leaves better at blocking sound than trees with few leaves?
Because more leaves absorb and stop more sound waves.
Name two types of trees that are good for blocking noise.
Ashoka and bamboo.
What mistake do people make when planting trees to block sound?
They plant them too far apart, letting sound pass through gaps.
Quick recap
Dense, leafy trees are best for blocking sound.
Trees like Ashoka, bamboo, neem, and peepal are good choices.
Trees absorb and reflect sound waves, reducing noise.
Planting trees close together makes a better sound barrier.
