Question

With reference to absorption in human digestive system, select the CORRECT statements from the following-
A. Carrier ions like \(\text{Na}^{+}\) bring about facilitated transport.
B. All ions are absorbed against concentration gradient only.
C. Facilitated transport requires energy.
D. Water is absorbed by facilitated transport.
E. Fructose is absorbed by facilitated transport.

• A. A and E only
• B. A, C and E only
• C. B and D only
• D. C, D and E only

Hint:

Facilitated transport uses carriers and no energy; water moves by osmosis.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
Absorption uses simple diffusion, facilitated transport, active transport and osmosis depending on the substance.

Step 2: Check each statement
A is true: carrier ions like \(\text{Na}^{+}\) help fructose and some amino acids cross by facilitated transport.
B is false: many ions move along their gradient by diffusion.
C is false: facilitated transport needs no energy.

Step 3: Check D and E
D is false: water is absorbed by osmosis.
E is true: fructose is absorbed by facilitated transport.

Final Answer:
Only statements A and E are correct. \[ \boxed{\text{(A) }\text{A and E only}} \]