Tag: cryptogams

Questions Related to cryptogams

What is the mode of reproduction in Pteridophyta?

botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

  1. Asexually by spores

  2. Sexually by formation of gametes

  3. Both A and B

  4. None of above

Show answer
Correct Option: C
Explanation:

Pteridophyta are multicellular, autotrophic plants, they can reproduce asexually as well as sexually. They reproduce asexually by formation of spores and sexually by the formation of gametes.

Which is important in development of seed habit?

botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

  1. Dependent sporophyte

  2. Haplontic life cycle

  3. Heterospory

  4. Free living gametophyte

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Correct Option: C

Pteridophytes are called vascular cryptogams as they are non-seeded plants containing

botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

  1. Only xylem

  2. Only phloem

  3. Neither xylem nor phloem

  4. Xylem and phloem

Show answer
Correct Option: D

A vascular cryptogam is

botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

  1. Equisetum

  2. Cedrus

  3. Marchantia

  4. Ginkgo

Show answer
Correct Option: A
Explanation:

Equisetum is a genus of Pteridophyta division. They are called as cryptogam. Vascular cryptogamic plants are those plants which have vascular system and do not have seeds. Equisetum is a vascular plant bearing hidden seeds.

Thus, the correct answer is option A.

Choose the correct answers from the alternatives given.
In the fern cycle, which of the following generation is dominant?

botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

  1. Haploid gametophyte

  2. Diploid gametophyte

  3. Haploid sporophyte

  4. Diploid sporophyte

Show answer
Correct Option: D
Explanation:
In the fern cycle, the sporophyte generation is dominant because the fern does not possess seeds, they only possess spores and thus diploid sporophyte is the dominant generation. In fern, gametophytes are tiny and only live for a few days. 

Identify the correct pair of characters with reference to Pteris. $I$. Neck canal cell is uninucleated $II$. Stem grows vertically in soil $III$. Apogamously produced sporophytes are haploids $IV$. Open dichotomous venation in leaflets.

botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

  1. $II$ and $IV$

  2. $III$ and $IV$

  3. $I$ and $II$

  4. $I$ and $III$

Show answer
Correct Option: A

In fern, rhizome

botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

  1. Vessels are absent.

  2. Sieve tubes are absent.

  3. Parenchyma is absent.

  4. Tracheids are absent.

Show answer
Correct Option: A
Explanation:

Fern stems are often called rhizomes, but this term refers to those with a long-creeping or climbing habit. If the stem is short and compact and radially symmetric, either erect, prostrate or ascending then it is called a caudex or rootstock. In some cases, the caudex is erect and tree-like with an apical radial tuft of leaves in which case it is often called a trunk. The rhizomes of ferns are very rarely naked and usually have some form of covering, especially on their growing tips, to provide protection from the extremes of temperature, desiccation, predation and physical abrasion. The rhizome have sieve tubes but there are no vessels. 

So, the correct answer is option A.

Match column I with column II and select the correct option from the codes given below.

Column I Column II
A. Pteris (i) Bryophyte
B. Cedrus (ii) Pteridophyte
C. Sonchus (iii) Gymnosperm
D. Marchantia (iv) Angiosperm
botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

  1. A-(ii), B-(iii), C-(iv), D-(i)

  2. A-(ii), B-(i), C-(iv), D-(iii)

  3. A-(i), B-(iii), C-(iv), D-(ii)

  4. A-(iii), B-(iv), C-(ii), D-(i)

Show answer
Correct Option: A
Explanation:

(A) Pteris - Pteridophyte

(B) Cedrus - Gymnosperm
(C) Sonchus - Angiosperm
(D) Marchantia - Bryophyte
So, the correct answer is (a).

Read statements $a-e$. How many are correct (a) In Equisetum the female gametophyte is retained on the parent sporophyte (b) In Ginkgo, male gametophyte is not independent (c) Riccia sporophyte is more developed than that in Polytrichum (d) Sexual reproduction in Volvox is isogamous (e) The spores of slime moulds lack cell walls.

botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

  1. One

  2. Two

  3. Three

  4. Four

Show answer
Correct Option: A

Give examples of division pteridophyta.

botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

  1. Adiantum and Lycopodium

  2. Marsilea and Selaginella

  3. Adiantum and Selaginella

  4. All of above

Show answer
Correct Option: D
Explanation:

Adiantum, Lycopodium, Marsilea and Selaginella are multicellular autotrophic plants, they belong to kingdom plantae, sub-kingdom: cryptogamae and division pteridophyta.