Tag: cryptogams

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Questions Related to cryptogams

Multiple choice botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

What is the mode of reproduction in Pteridophyta?

  1. Asexually by spores

  2. Sexually by formation of gametes

  3. Both A and B

  4. None of above
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

Multiple choice botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

Which is important in development of seed habit?

  1. Dependent sporophyte

  2. Haplontic life cycle

  3. Heterospory

  4. Free living gametophyte
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heterospory is considered a crucial evolutionary step toward the seed habit, as it leads to the retention of the megaspore and the development of the female gametophyte within the parent plant.

Multiple choice botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

A vascular cryptogam is

  1. Equisetum

  2. Cedrus

  3. Marchantia

  4. Ginkgo
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

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

  1. Haploid gametophyte

  2. Diploid gametophyte

  3. Haploid sporophyte

  4. Diploid sporophyte
Reveal answer Fill a bubble to check yourself
D Correct answer
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. 
Multiple choice botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

In fern, rhizome

  1. Vessels are absent.

  2. <span>Sieve tubes are absent.</span>

  3. Parenchyma is absent.

  4. Tracheids are absent.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

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

  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)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(A) Pteris - Pteridophyte

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

Multiple choice botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

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.

  1. One

  2. Two

  3. Three

  4. Four
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Only statement (b) is correct: Ginkgo male gametophytes are not independent. (a) is false because Equisetum gametophytes are independent. (c) is false because Polytrichum sporophytes are more complex than Riccia. (d) is false because Volvox reproduction is oogamous. (e) is false because slime mould spores have cellulose cell walls.