Chrysophytes are
(a) Diatoms and desmids
(b) Diatoms and dinoflagellates
(c) Slime molds and desmids
(d) Slime molds and diatoms

Options

A. Diatoms and desmids
B. Diatoms and dinoflagellates
C. Slime moulds and desmids
D. Slime moulds and diatoms

Answer

To determine which organisms are classified as Chrysophytes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the term "Chrysophytes":**
- Chrysophytes are a group of organisms that are primarily known for their golden-brown pigments and are often referred to as golden algae.

2. **Identify the options provided:**
- (a) Diatoms and desmids
- (b) Diatoms and dinoflagellates
- (c) Slime molds and desmids
- (d) Slime molds and diatoms

3. **Analyze the first option (a): Diatoms and desmids:**
- Diatoms are a significant group of algae known for their silica cell walls, and they are indeed classified under Chrysophytes.
- Desmids are a type of green algae that are also considered part of the Chrysophyte group.

4. **Analyze the second option (b): Diatoms and dinoflagellates:**
- While diatoms are part of the Chrysophytes, dinoflagellates belong to a different group of protists and are not classified as Chrysophytes.

5. **Analyze the third option (c): Slime molds and desmids:**
- Slime molds are not classified as Chrysophytes; they belong to a different category of protists.

6. **Analyze the fourth option (d): Slime molds and diatoms:**
- Again, slime molds are not part of the Chrysophyte group, even though diatoms are.

7. **Conclusion:**
- The correct answer is option (a) Diatoms and desmids, as both of these organisms are included in the Chrysophyte group.

### Final Answer:
**(a) Diatoms and desmids**