Earthworm Biology and Ecology

The video tutorial explores earthworms, covering their anatomy, habitat, diet, reproduction, and environmental importance. Earthworms are tube-shaped animals with segmented bodies and bristles called sete for movement. They live in moist environments and breathe through their skin. Earthworms eat organic matter, aiding soil health through vermicomposting. They reproduce by exchanging sperm and laying eggs in cocoons. Earthworms are vital for soil aeration and nutrient cycling. They have unique features like five pairs of hearts and the ability to regenerate parts of their bodies.

What helps earthworms move through the soil?

• Their wings

• Their sharp teeth

• Tiny bristles called sete

• Their long tails

Why do earthworms come to the surface after it rains?

• To escape predators

• To dry off

• To find food

• Because the wet ground is easier to move through

What is the primary diet of earthworms?

• Insects

• Dead leaves and organic matter

• Fresh fruits

• Small animals

What organ do earthworms use to grind up their food?

• Stomach

• Gizzard

• Teeth

• Liver

How many pairs of hearts do earthworms have?

• Ten

• Five

• Three

• Two

What ability do earthworms have if they are cut in half?

• The head part can grow a new tail

• Both halves can regenerate

• They cannot regenerate

• The tail part can grow a new head

How do earthworms sense light and darkness?

• With their eyes

• With special cells in their skin

• With their antennae

• With their ears

Why are earthworms important for the environment?

• They eat harmful insects

• They help keep the soil healthy

• They produce oxygen

• They provide food for birds

What threats do earthworms face?

• Predation by large animals

• Lack of food

• Pesticides and chemicals

• Overpopulation

What is the process called when earthworms help break down organic material in soil?

• Decomposition

• Vermicomposting

• Photosynthesis

• Fermentation