Select the incorrect statements `:-`
(a) alimentary canal begins with an anterior cavity called buccal cavity.
(b) tooth is embeedded in a socket of mandible bone only.
(c ) human shows strict diphyodont type of dentition
(d) oesophagus and the trachea open into the pharynx.

Options

A. a,b,c &d
B. a,b,& c
C. a,c,&d
D. a,b &d

Answer

To solve the question of selecting the incorrect statements about the human alimentary canal and dentition, we will analyze each statement one by one.

**Step 1: Analyze Statement (a)**
- Statement (a) claims that the alimentary canal begins with an anterior cavity called the buccal cavity.
- The alimentary canal, also known as the digestive tract, starts at the mouth, which includes the buccal cavity. However, it is more accurate to say that the mouth is the starting point, and the buccal cavity is a part of it. Therefore, this statement is incorrect.

**Step 2: Analyze Statement (b)**
- Statement (b) states that a tooth is embedded in a socket of the mandible bone only.
- In humans, teeth are embedded in sockets of both the mandible (lower jaw) and the maxilla (upper jaw). Thus, this statement is also incorrect.

**Step 3: Analyze Statement (c)**
- Statement (c) claims that humans show strict diphyodont type of dentition.
- Humans actually exhibit both diphyodont (having two sets of teeth) and monophyodont characteristics (having one set of teeth). Therefore, this statement is incorrect as well.

**Step 4: Analyze Statement (d)**
- Statement (d) states that the esophagus and the trachea open into the pharynx.
- The pharynx does serve as a common passage for both the esophagus and the trachea, but it does not mean they open into it in the same way. The esophagus leads to the stomach, while the trachea leads to the lungs. This statement is misleading and can be considered incorrect.

**Conclusion:**
All four statements (a), (b), (c), and (d) are incorrect.

**Final Answer:** All statements (a), (b), (c), and (d) are incorrect.

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