Question

Select the best reason of difference between endocrine gland from exocrine glands.
• Secrete hormones into blood
• Have ducts
• They are differ in their structures
• One secrete enzyme the other secrete mucus

• A. Secrete hormones into blood
• B. Have ducts
• C. They differ in their structures
• D. One secretes enzyme, the other secretes mucus

Hint:

Endocrine glands:
• Ductless
• Hormones released into blood Exocrine glands:
• Have ducts

Answer 1

The Correct Option is A

Concept: Glands in the body are mainly classified into:
• Endocrine glands
• Exocrine glands The major difference lies in: \[ \boxed{ \text{Presence or absence of ducts and nature of secretion} } \]

Step 1: Understand endocrine glands. Endocrine glands:
• Are ductless glands
• Release hormones directly into blood Examples:
• Pituitary gland
• Thyroid gland
• Adrenal gland Thus endocrine secretions travel through blood to target organs.

Step 2: Understand exocrine glands. Exocrine glands:
• Possess ducts
• Release secretions through ducts Examples:
• Salivary glands
• Sweat glands
• Pancreatic exocrine part

Step 3: Analyze options carefully.
• Option 1 correctly states endocrine glands secrete hormones into blood.
• Option 2 is incorrect because endocrine glands do not have ducts.
• Option 3 is vague and not the best distinguishing feature.
• Option 4 is incorrect because both glands can produce different kinds of substances.

Step 4: Choose correct answer. Thus the best distinguishing feature is: \[ \boxed{ \text{Secretion of hormones directly into blood} } \] Hence correct option is: \[ \boxed{(1)} \] Final Conclusion: Endocrine glands are ductless glands that release hormones directly into bloodstream. Hence correct answer is: \[ \boxed{(1)} \]