Question

The product of conjugation in Spirogyra or fertilization of Chlamydomonas is
A. Zygospore
B. Zoospore
C. Oospores
D. Carpospores

Answer 1

Hint: Fertilization refers to the fusion of male and female gametes.
As a result of fertilization, the formation of zygote takes place.

Complete answer: The product of conjugation in Spirogyra or fertilization in Chlamydomonas is option A. zygospore.
1. Zygospore is a diploid zygote which is formed by the fusion of male and female gamete cells.
2. Zygospore is spherical in structure with a smooth and thick wall.
3. The zygote releases a thick substance called rvali, which helps in the formation of zygote. It has three layers – a thick wall, a diploid nucleus, a layer for an abundant food reserve.
The food is reserved as oil and starch.
4. Zygospore represents the resting stage that is formed after the withdrawal of flagella and the formation of a thick wall around the freshly formed zygote.
5. Zygospore contains fats and reserve food materials other than starch.
It can resist and survive in unfavorable conditions.
6. In Chlamydomonas, zygospore is formed as a result of Isogamy, anisogamy, or oogamy.
7. In Spirogyra, conjugation is the process for sexual reproduction, which may be scalariform or lateral.

Additional information: Zoospore can be defined as a spore of certain algae, fungi, and protozoans, which are capable of swimming with the help of a flagellum.
Oospore can be referred to as a zygote, having a thick-wall, of certain algae and fungi, that is formed by fertilization of an oosphere.
A carpospore is a diploid spore. It is produced by red algae.
After fertilization, the carpogonium of the alga is subdivided into carpospores.
It is the largest type of spores. It is larger than any other spore-like bispores, which are even larger than tetraspores.

So, here the correct answer is option A. Zygospore.

Note: Spores are the agents of asexual reproduction that are produced by the alga, fungi, bacteria, and even plants. It helps to combat the unfavorable condition.
Gametes are units of sexual reproduction.