Bioluminescence in Nature | Elementary ESL Worksheet PDF

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Bioluminescence in Nature

Reading Worksheet — Elementary (C) | tahricteaches.com

Some living things can make their own light. This light is called bioluminescence. It is not hot like fire. It is a soft, cool glow. We can see this light at night. Bioluminescence happens in the sea and on land. Many animals use it to live and stay safe.

The deep ocean is very dark. The sun cannot reach the bottom. But the water is not empty. Many viumbe there make their own light. Some fish have lights on their heads. They glow blue or green in the dark water.

On land, the firefly is famous for its light. On warm summer nights, fireflies fly in the air. Their small lights blink on and off. They use the light to find a friend. Many people love to watch them.

Why do animals make light? Some use light to find food. The light can attract small fish or bugs. When the food comes close, the animal can eat it. Other animals use light to scare away enemies. This keeps the animal safe. Light is a useful tool for many animals.

Animals make light with a chemical inside their bodies. The chemical mixes with air and makes a glow. This is a clever trick from nature. Scientists study these animals to learn more. Their natural light is truly amazing.

A. Msamiati

  1. glow ____
  2. ocean ____
  3. dark ____
  4. firefly ____
  5. creature ____
  6. attract ____
  7. chemical ____
  8. signal ____
  9. deep ____
  10. nature ____
  • a. very large body of salt water
  • b. world of plants, animals, and land around us
  • c. substance that can mix and react to make something new
  • d. small flying insect that makes light at night
  • e. having little or no light
  • f. living animal
  • g. make something come closer
  • h. sign or action that sends a message
  • i. soft, steady light that is not hot
  • j. far down from the top
Bioluminescence in Nature worksheet

B. Kweli au Si Kweli

  1. ____   Bioluminescence is a kind of light.
  2. ____   The light from bioluminescence is very hot.
  3. ____   The deep ocean is very dark.
  4. ____   The sun reaches the bottom of the deep ocean.
  5. ____   Fireflies make light at night.
  6. ____   Fireflies live deep in the ocean.
  7. ____   Some animals use light to find food.
  8. ____   Animals make light with a chemical inside their bodies.
  9. ____   No animals use light to scare away enemies.
  10. ____   Bioluminescence happens only on land.

C. Jaza Nafasi Zilizoachwa Hapo

Benki ya Neno: ocean, firefly, attract, glow, dark, chemical, signal, creature
  1. The deep ___ is full of animals that make light.
  2. A ___ blinks its small light on summer nights.
  3. Some animals use light to ___ small fish or bugs.
  4. The soft, cool light that animals make is called a ___.
  5. The bottom of the deep sea is very ___.

D. Maswali ya Uelewa

  1. Why is the deep ocean dark?
  2. How do fireflies use their light?
  3. How do animals make their own light?

E. Maswali ya Majadiliano

  1. Would you rather see fireflies on land or glowing animals in the ocean? Why?
  2. If you could glow in the dark, when would you use your light?
Answer Key (click to reveal)

A. Msamiati: 1-i, 2-a, 3-e, 4-d, 5-f, 6-g, 7-c, 8-h, 9-j, 10-b

B. Kweli/Si kweli: 1-T, 2-F, 3-T, 4-F, 5-T, 6-F, 7-T, 8-T, 9-F, 10-F

C. Jaza Nafasi Zilizoachwa: 1-ocean, 2-firefly, 3-attract, 4-glow, 5-dark

D. Uelewa:

  1. The deep ocean is dark because the sun cannot reach the bottom.
  2. Fireflies use their light to find a friend.
  3. They make light with a chemical inside their bodies that mixes with air.

© Tahric Teaches | tahricteaches.com

🇹🇼 Also in Chinese: This topic is available on 18KEnglish.com — bilingual worksheets for Chinese-speaking students.

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