Quiz on Zoospores vs Aplanospores Differences

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Questions and Answers

What is the characteristic feature of autospores?

They are similar to the parent cell in all respects except size (correct)

They have flagella

They have a cell wall distinct from the parent wall

They are produced by meiotic division

Which type of spores are produced by the division of the protoplast in three planes?

Zoospores

Endospores (correct)

Exospores

Aplanospores

What is the main difference between aplanospores and autospores?

Presence or absence of a cell wall

Size and structure (correct)

Method of production

Presence or absence of flagella

Which of the following is NOT a characteristic of zoospores?

They are non-motile Signup and view all the answers

What is the mechanism of exospore formation?

Rupturing of the cell wall apically Signup and view all the answers

What is the main difference between spores produced by meiotic division and mitotic division?

Method of production Signup and view all the answers

What is the main function of akinetes in algae?

To provide a means of perennation and multiplication Signup and view all the answers

How do akinetes separate from the parent cell?

By the decay or drying up of the vegetative cell Signup and view all the answers

What is the characteristic of aplanospores?

They are non-flagellated Signup and view all the answers

What is the term for the process of akinete formation in algae?

Akinetogenesis Signup and view all the answers

Which of the following spores is not mentioned in the text?

Cyanospores Signup and view all the answers

What is the characteristic of zoospores?

They are flagellated and contain a chromatophore Signup and view all the answers

In which type of cell can asexual spores be formed?

In any vegetative cell or in specially differentiated cells called sporangia Signup and view all the answers

What is the purpose of asexual reproduction in algae?

To multiply the algae under favourable conditions Signup and view all the answers

What is the characteristic of isogamous type of sexual reproduction?

Male and female gametes are morphologically similar but differ physiologically Signup and view all the answers

What is the main difference between anisogamous and oogamous types of sexual reproduction?

The motility of male and female gametes Signup and view all the answers

Which type of sexual reproduction is considered to be the most advanced?

Oogamous Signup and view all the answers

What is the characteristic of heterogamous type of sexual reproduction?

Male and female gametes differ in size and physiology Signup and view all the answers

What is the term for the male reproductive body in Rhodophyceae?

Spermatangium Signup and view all the answers

Which type of sexual reproduction is common in unicellular algae?

Isogamous Signup and view all the answers

What is the characteristic of oogamous type of sexual reproduction?

Female gametes are motile and larger in size Signup and view all the answers

What is the term for the female reproductive body in Rhodophyceae?

Oogonium Signup and view all the answers

Study Notes

Fragmentation

Fragmentation is a process where each fragment grows into a new individual under favorable conditions
It involves the repeated division and subsequent separation of component cells

Akinetes

Akinetes are single-celled, resting fragments specially modified for perennation and multiplication
They are formed either singly or in chains in the vegetative filament
The entire protoplast of the vegetative cell loses water, contracts, and becomes rounded or oval in form
The parent cell wall becomes thickened and highly resistant
Akinetes enable the species to tide over unfavorable periods for growth
Each akinete grows into a new filament under suitable conditions

Asexual Reproduction

Asexual reproduction is the commonest method of multiplication among algae under favorable conditions
It may take place repeatedly during the season
It involves the formation of specialized cells, including zoospores, aplanospores, autospores, hypnospores, carpospores, tetraspores, endospores, and exospores
Zoospores are the most important kind of asexual spore, provided with one or more flagella and a chromatophore, nucleus, and eye spot
Aplanospores are non-flagellated

Sexual Reproduction

Sexual reproduction can be categorized into two types: isogamous and heterogamous

Isogamous

Isogamy is a type of sexual reproduction common among unicellular algae
Both male and female gametes are morphologically similar but differ physiologically
It is considered a primitive nature

Heterogamous

Heterogamy is a more advanced type of sexual reproduction
Both male and female gametes differ morphologically and physiologically
Male gametes are usually smaller in size
Heterogamy can be further divided into anisogamous and oogamous types

Anisogamous

Both fusing gametes are motile, but male gametes are smaller in size and more active (e.g., Pandorina and Chlamydomonas)

Oogamous

It is considered the most advanced type of sexual reproduction
Male gametes are motile and found in large numbers, whereas female gametes are non-motile and larger in size
It is common among higher algae

Life Cycles in Algae

There are three different types of life cycles, depending on when meiosis occurs, the type of cells produced, and if there is more than one free-living stage present in the life cycle

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Description

This quiz covers the process of fragmentation, a method of asexual reproduction in organisms, and akinetes, a type of modified cell that helps in perennation and multiplication.