Question

write two characters of phyllum mollusca​

Answer 1

Answer:

Characteristic Features of Phylum Mollusca.....

• They are bilaterally symmetrical.
• They are triploblastic, which three layers.
• They show organ system grade of organisation.
• The body is soft and unsegmented.
• Body is divisible into three regions – head, a visceral mass, and ventral foot.
• Body is covered by a mantle and shell.
• They can be found in different habitats, both aquatic and terrestrial.
• The body cavity is a haemocoel, through which blood circulates.
• The digestive system is well developed and complex. It has a radula, which is a rasping structure that has chitinous teeth. It is used in feeding.
• The nervous system is made up of paired ganglia, connectives, and nerves.
• The circulatory system is open, with heart and aorta.
• Respiration occurs through gills called ctenidia.
• The ventral muscular foot helps in locomotion.
• They have a pair of kidneys (metanephridia)
• Sexes are separate and reproduction is through sexual reproduction.
• Fertilisation can be internal or external.

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Answer 2

❥HERE'S YOUR ANSWER

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➪THEY SHOW ORGAN SYSTEM GRADE OF ORGANISATION.

➪ THE BODY IS SOFT AND UNSEGMENTED. BODY IS DIVISIBLE INTO THREE REGIONS:

◆ HEAD

◆ A VISCERAL MASS

◆ VENTRAL BODY.

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