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Select correct statement w.r.t Nostoc. ...

Select correct statement w.r.t Nostoc.
`A.` It is a filamentous blue-green algae
`B.` Has ability to fix atmospheric nitrogen in specialised cells having thin wall
`C.` Performs oxygenic photosynthesis
Option 1 A & B
Option 2 B & C
Option 3 only C
Option 4 A & C

A

`A &B`

B

`B & C`

C

only `C`

D

`A & C`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding Nostoc, we will analyze each statement provided and determine their accuracy. ### Step-by-Step Solution: 1. **Evaluate Statement A**: - Statement A claims that Nostoc is a filamentous blue-green algae. - Nostoc is indeed classified under Cyanobacteria, which are commonly referred to as blue-green algae. Additionally, Nostoc forms filamentous structures known as trichomes. - **Conclusion**: Statement A is **correct**. 2. **Evaluate Statement B**: - Statement B states that Nostoc has the ability to fix atmospheric nitrogen in specialized cells having thin walls. - While Nostoc does have the ability to fix nitrogen, it does so in specialized cells called heterocysts. These heterocysts actually have thick walls, not thin walls, which protect the nitrogen-fixing process from oxygen. - **Conclusion**: Statement B is **incorrect**. 3. **Evaluate Statement C**: - Statement C claims that Nostoc performs oxygenic photosynthesis. - Nostoc is a photoautotroph, meaning it uses light to synthesize food and produces oxygen as a byproduct, which qualifies it as performing oxygenic photosynthesis. - **Conclusion**: Statement C is **correct**. 4. **Combine the Results**: - From our evaluations, we found that: - Statement A is correct. - Statement B is incorrect. - Statement C is correct. - Therefore, the correct statements are A and C. 5. **Select the Correct Option**: - The options provided are: - Option 1: A & B - Option 2: B & C - Option 3: only C - Option 4: A & C - Since A and C are correct, the correct answer is **Option 4: A & C**. ### Final Answer: **Option 4: A & C**
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