Cryptogams-Algae (IFS (Forests Services) Botany (Mains)): Questions 1 - 8 of 16

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Question number: 1

» Cryptogams » Algae

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

Comment upon the palmella stage. (Paper-1, Section-A)

Explanation

  • Palmella stage is a type of asexual reproduction and is found in some algae manly in Euglena and Chlamydomonas.

  • Palmella stage is formed in unfavorable conditions.

  • Under unfavorable conditions, zoospores are remain enclosed with the parent cell wall and is grows in size and divided and large numbers of zoospores are found without flagella in clusters

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Question number: 2

» Cryptogams » Algae

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

With the help of labelled diagram, describe the reproductive organs of Chara. (Paper-1, Section-A)

Explanation

  • Chara is aquatic attached to muddy or sandy bottom of the pools, lakes, flowing streams and ponds of clear water.
  • In Chara, reproduction is takes place by vegetative and sexual method.

Vegetative reproduction:

Vegetative reproduction is takes place by three ways;

(1) By amylum stars: The cells of some subterranean nodes become star-shaped and very much

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Question number: 3

» Cryptogams » Algae

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

What is the main basis of classification in algae? Describe the important characters of various classes of algae. (Paper-1, Section-A)

Explanation

The presence or absence of pigments which transmit colour to the algae forms is the main basis of classification of algae.

Image shows Various types of algae explained

Image Shows Various Types of Algae Explained

The divisions are based on the factors

  • Major photosynthetic pigments present,

  • Form of stored food,

  • Cell wall composition and

  • Number of flagella and position of insertion.

Chlorophyceae

  • Chlor

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Question number: 4

» Cryptogams » Algae

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

What are the pigments that are found in red algae? (Paper A Section A)

Explanation

  • Red algae is also known as Rhodophyta and they are marine plants that live mainly in shallow waters and deep tropical seas and some are live in freshwater.
  • Red algae have no flagella and typically grow attached to a hard surface or on other algae.
Image showing red algae.

Image Showing Red Algae

Image showing pigments of red algae.

Image Showing Pigments of Red Algae

  • Red algae contain different pigments, includin

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Question number: 5

» Cryptogams » Algae

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Comment on the contractile vacuoles in Euglena. (Paper A Section A)

Explanation

Contractile vacuoles:

  • Contractile vacuole is a single vacuole and osmotically collected water and then is reformed by a progressive clotting of smaller vacuoles.
  • Contractile vacuoles protect a cell from absorbing too much water and potentially exploding by excreting excess water.

Contractile vacuoles in Euglena:

  • Euglena is single celled organisms lacki

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Question number: 6

» Cryptogams » Algae

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Appeared in Year: 2014

Short Answer Question▾

Write in Short

Write a brief note on the advantage of diploid carposporophyte generation in red algae. (Paper A Section A)

Question number: 7

» Cryptogams » Algae

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

Write about the following: Algae as Bio-fertilizer (Paper 1, Section A)

Explanation

  • Blue green algae (BGA) are photoautotrophic, prokaryotic algae. They are free living and also known as cyanobacteria. It fixes the atmospheric nitrogen in moist soils. So BGA has been recommended as a Biofertilizer.

  • Biofertilizers are organisms that enrich the nutrient quality of soil.

  • Main sources of biofertilizers are bacteria, fungi, and cyanobact

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Question number: 8

» Cryptogams » Algae

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

Advantage of diploid carposporophyte in red algae?

Explanation

  • In red alage Triphasic type of lifecyle is seen in red alage-

    • Haplobiontic Triphasic type

    • Diplobiontic Triphasic type

  • There are two diploid phase Carposporophyte and tetrasporophyte alternating with haploid gametophyte phase.

  • Male and female gametes fuse together to form zygote. further,

  • In alage like florideace the fertilization is followed by the prod

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