Read the statements carefully and choose the correct option A) heat is well adapted to tolerate high temperature. B) Bundle sheath cells of maize seeds are larger thick walled without intercellular space. C) Breakdown of C_4 acid and C_4 pathway occurs in bundle seath cells D) `C_4` plants shows `CO_2 concentration mechanism

Options

A. A, B and D are correct
B. B, C and D are correct
C. A and D are incorrect
D. B and C are incorrect

Answer

To solve the question, we need to evaluate each statement provided and determine whether they are true or false.

**Step 1: Evaluate Statement A**
- Statement A claims that "wheat is well adapted to tolerate high temperature."
- Wheat has an optimum temperature range for photosynthesis between 20 to 30 degrees Celsius. Beyond 30 degrees Celsius, wheat is sensitive to heat and photosynthesis significantly decreases or does not occur. Therefore, this statement is **false**.

**Step 2: Evaluate Statement B**
- Statement B states that "Bundle sheath cells of maize seeds are larger, thick-walled without intercellular space."
- Maize is a C4 plant, and it exhibits Kranz anatomy, where bundle sheath cells are indeed larger, thick-walled, and lack intercellular spaces. This adaptation allows for more efficient photosynthesis. Thus, this statement is **true**.

**Step 3: Evaluate Statement C**
- Statement C claims that "Breakdown of C4 acid and C4 pathway occurs in bundle sheath cells."
- In C4 plants, the breakdown of C4 acids (like oxaloacetate) and the subsequent steps of the C4 pathway occur in the bundle sheath cells. This is a characteristic of C4 photosynthesis. Therefore, this statement is **true**.

**Step 4: Evaluate Statement D**
- Statement D states that "C4 plants show CO2 concentration mechanism."
- C4 plants have a CO2 concentration mechanism that enhances the concentration of CO2 around the enzyme RuBisCO, which minimizes photorespiration and increases photosynthetic efficiency. This statement is also **true**.

**Conclusion:**
- The correct statements are B, C, and D. The only incorrect statement is A.

**Final Answer:**
The correct options are B, C, and D.

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