Give an example of a symbiotic relationship between a fungus and another organism, explain the ecological importance of the relationship and describe how each partner benefits.

1. Give an example of a symbiotic relationship between a fungus and another organism, explain the ecological importance of the relationship and describe how each partner benefits.

2. Describe the advantages and disadvantages of asexual versus sexual reproduction, and explain why fungi often undergo sexual reproduction when environmental conditions become unfavorable.

3. List three characteristics of arthropods that have contributed to their success (there are over 1 million species of arthropods), and explain the importance of each characteristic.

4. Pick one of the following phyla of animals:
Cnidarians, Echinoderms, Arthropods, Molluscs, Nematodes, Annelids

Indicate the phylum you picked, describe the distinguishing characteristics of the phylum, and give three examples of animals in this phylum.

Expert Solution

1 Mycorhiza - plant and fungi (mutualism) , Lichen (Fungi and algae)

2 Asexual Reproduction - Adv - Rapidly populating, It does not need mates. '

Disadvantages - Diversity is absent , Inability to adapt

3 Arthopods

Jointed appendages , Chitnous Exoskeleton , Segmented bodies and Bilateral symmetry

4

Cnidaria - Presence of Nematocyst (Sea Anemone, Aurelia, Hydra)

Echinodermata - Exclusively marine ,Water vascular system ( Asterias , Holothuroidea , Crinoidia)

Arthopods - Jointed appendages , Chitnous Exoskeleton , Segmented bodies and Bilateral symmetry ( Crab , Insect ,Prawn)

mollusca - Body divisible head visceral mass and visceral foot ( Octopus , snails scallaps)

Nematoda - Dorsoventrally flattened body ( Tapeworms , flukes, Fasciola )

Annelida - Parapodia Segmented bodies and coelom ( Earthworm , Leech , Lugworm)

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