Question

9.7 ■ cross sections through (a and b) pharyngeal region and (c) posterior region of planaria. check your progress 1.1 define the following terms: auricle pharynx acoelomate monoecious

Explanation:

1. Auricle: In planaria, auricles are lateral extensions on the head that function as chemosensory organs, helping the organism detect chemical stimuli in its environment.
2. Pharynx: The pharynx in planaria is a muscular tube - like structure that can be everted to suck in food. It is an important part of the digestive system, connecting the mouth to the gastrovascular cavity.
3. Acoelomate: Acoelomates are animals that lack a body cavity (coelom) between the body wall and the digestive tract. Planaria are acoelomates, which means their internal organs are embedded in mesodermal tissue.
4. Monoecious: Monoecious organisms have both male and female reproductive organs within the same individual. Planaria are monoecious, allowing them to potentially self - fertilize although cross - fertilization is more common.

Answer:

• Auricle: Lateral head extensions for chemosensing in planaria.
• Pharynx: Muscular tube for feeding in planaria, connects mouth to gastrovascular cavity.
• Acoelomate: Organisms lacking a body cavity, like planaria with organs in mesodermal tissue.
• Monoecious: Organisms with both male and female reproductive organs, like planaria.