MCQ
Bilaterally symmetrical but acoelomate animal is
- ✓Liver fluke
- BJelly fish
- CRound worms
- DCrab
✓
Answer
Correct option: A.
Liver fluke
a
(a)Platyhelminthes $(liver-fluke)$ are first acoelomate animals, which have organ system organization and bilateral symmetry.
(a)Platyhelminthes $(liver-fluke)$ are first acoelomate animals, which have organ system organization and bilateral symmetry.
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Mark the given statements True (T) or False (F).
(i) The process of exchange of O2 from the atmosphere with CO2 produced by cells is called breathing.
(ii) Mechanisms of breathing vary among different groups of animals depending mainly on their habitat and level of organisation.
(iii) Earthworm use their moist skin for breathing.
(iv) The nasal chamber opens into the pharynx, a portion of which is common passage for food and air
(v) Larynx is a bony box which helps in sound production and hence called sound box.
(vi) During swallowing, glottis can be converted into a thick cartilaginous flap called epiglottis to prevent entry of food into larynx.
(vii) Trachea is a straight tube extending up to the mid-thoracic cavity, which divides at the level of 5-thoracic vertebra into right and left primary bronchi.
(viii) Humans have two lungs which are covered by a single layered pleura, with pleural fluid between them.
(ix) The part starting with external nostrils up to terminal bronchioles constitute conducting part whereas the alveoli and their ducts form respiratory or exchange part of respiratory system.
(x) The thoracic chamber is formed dorsally by the vertebral column, ventrally by the sternum, laterally by the ribs and on the lower side by dome-shaped diaphragm.
Choose the correct option given below :-
(i) The process of exchange of O2 from the atmosphere with CO2 produced by cells is called breathing.
(ii) Mechanisms of breathing vary among different groups of animals depending mainly on their habitat and level of organisation.
(iii) Earthworm use their moist skin for breathing.
(iv) The nasal chamber opens into the pharynx, a portion of which is common passage for food and air
(v) Larynx is a bony box which helps in sound production and hence called sound box.
(vi) During swallowing, glottis can be converted into a thick cartilaginous flap called epiglottis to prevent entry of food into larynx.
(vii) Trachea is a straight tube extending up to the mid-thoracic cavity, which divides at the level of 5-thoracic vertebra into right and left primary bronchi.
(viii) Humans have two lungs which are covered by a single layered pleura, with pleural fluid between them.
(ix) The part starting with external nostrils up to terminal bronchioles constitute conducting part whereas the alveoli and their ducts form respiratory or exchange part of respiratory system.
(x) The thoracic chamber is formed dorsally by the vertebral column, ventrally by the sternum, laterally by the ribs and on the lower side by dome-shaped diaphragm.
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