Invertebrates 6

Question 1

Description (nematodes)

Answer 1

Nematodes, or roundworms, are abundant, mostly microscopic organisms found in various environments. They have a simple tubular gut and lack circulatory and respiratory systems.

Question 2

Key Features(nematodes)

Answer 2

Protected by a cuticle, molted periodically. Sensory organs transmit information to a nerve ring. Reproduce mostly sexually, with males transferring sperm to females’ bodies.

Question 3

Life Cycle(nematodes)

Answer 3

Some nematodes are free-living decomposers, while others are parasites infecting animals and plants, causing diseases.

Question 4

Human Impact(nematodes)

Answer 4

Certain nematodes are economically important pests, affecting agriculture and livestock. Others cause diseases in humans, necessitating control measures.

Question 5

Description(Echinoderms)

Answer 5

Echinoderms, including sea stars and sea urchins, possess a calcium carbonate endoskeleton and radial symmetry as adults. They have a unique water-vascular system for locomotion and respiration

Question 6

Key Features(Echinoderms)

Answer 6

Primitive nervous system with no distinct brain. Fluid-filled coelom for circulation and gas exchange. Able to regenerate lost body parts and reproduce sexually with external fertilization.

Question 7

Ecological Role(Echinoderms)

Answer 7

Echinoderms play critical roles in marine ecosystems as predators, prey, and habitat modifiers. They contribute to biodiversity and ecosystem stability.

Question 8

Conservation(Echinoderms)

Answer 8

Echinoderms face threats from habitat destruction, pollution, and climate change. Conservation efforts aim to protect their habitats and manage human activities to ensure their survival.