36 Questions
Which of the following animals belong to Phylum Mollusca?
Octopus
What type of shell do many organisms belonging to Phylum Mollusca have?
Calciferous shell
Where can organisms belonging to Phylum Mollusca be found?
In terrestrial regions and depths of the seas
What is a notable characteristic of Molluscs with shells?
Production of pearls
Which of the following is an example of an animal from Phylum Mollusca?
Oyster
What role do Molluscs play in the ecosystem?
They provide food for other organisms
What is the size range of molluscans?
From 20 meters to one millimeter
What are pearls lined with?
Nacre
What are bivalve molluscs used as indicators of?
Freshwater and marine environments
What structure do molluscs use in feeding?
Radula
Where does respiration occur in molluscs?
Through gills called ctenidia
Which class of molluscs do snails belong to?
Gastropoda
What is the circulatory system of molluscs like?
Open with heart and aorta
Where do molluscs have a pair of kidneys?
In the mantle cavity
What is the characteristic feature of the body cavity in molluscs?
Haemocoel
Which of the following is a class of molluscs?
Bivalvia
What type of reproduction do molluscs undergo?
Both sexual and asexual reproduction
What is the shell made of in molluscs?
Calcium carbonate
What is the definition of 'niche' in the context of marine ecology?
The resources (biotic & abiotic) an organism uses for survival, growth and reproduction
What is the role of ecology in the survival and distribution of organisms?
It is the interaction between organisms and their environment
What is the definition of 'habitat' in the context of marine ecology?
The physical place where an organism lives
What do intertidal communities in marine ecology refer to?
Organisms living in a defined area that experience periodic submersion and exposure
What is the main focus of marine ecology when studying intertidal communities?
Describing the interaction between organisms and their environment
How do organisms within a community interact with each other in marine ecology?
Through complex ways that affect their survival and distribution
What term is used to describe resources that have the ability to affect the growth of a population?
Limiting resources
What is the maximum number of organisms that any habitat can support known as?
Carrying capacity
Which of the following is a way in which species can interact?
Competition
When does intraspecific competition occur?
Among members of the same species
What may happen to poorer competitors in the presence of competition for resources?
They may become extinct
What do individuals of different species engage in when they compete for resources?
Interspecific competition
Which type of interaction may result in a reduced ability of an individual to reproduce or survive?
Interference competition
What is the term used to describe competition between organisms of the same species?
Intraspecific competition
What is the term commonly used to refer to interactions among organisms within a community?
Community dynamics
In marine ecology, what happens when organisms 'fight' with one another over a limiting resource they both require for survival?
Competition
What is the name for the mechanism where organisms engage in mutual benefit or dependence?
Symbiosis
What may occur as a result of different species competing for existing resources?
Interspecific competition
Learn about the diverse animals of Phylum Mollusca and their ecological significance in this lecture from Suez Canal University. Explore the characteristics and importance of mollusks such as snails, octopuses, squids, oysters, and clams, as well as their role in the ecosystem.
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