Tag: botany

Questions Related to botany

Ferns fall under the category of

botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

  1. Thallophytes

  2. Bryophytes

  3. Pteridophytes

  4. Mesophytes

Show answer
Correct Option: C
Explanation:

Pteridophytes are vascular plants which have leaves (known as fronds), roots and sometimes true stems, and tree ferns have full trunks. For example, ferns, horsetails and clubmosses. Fronds in the largest species of ferns can reach some six meters in length. Many ferns from tropical rain forests are epiphytes, which means they only grow on other plant species. Their water comes from the damp air or from rainfall running down branches and tree trunks. There are also some purely aquatic ferns such as water fern or water velvet (Salvinia molesta) and mosquito ferns (Azolla species). 

Therefore, the correct answer is option C.

What happens to motile spore after it ejects from sporophytes in pteridophyte plants?

botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

  1. It germinates to become another spore forming a fern plant

  2.  It germinates to become a prothallus

  3. It joins with another spore to become a seedling

  4. It encysts and devours by snail-like organisms

Show answer
Correct Option: B
Explanation:

Pteridophytes are seedless ferns. They use sexual and asexual mode of reproduction. Spores produced by pteridophytes that help in sexual reproduction. These spores are carried long distances for pollination by abiotic factors like wind, water, etc. Once the spore reaches its destination, it releases the male gametes into the female reproductive system and merges with the female gamete. After successful divisions, it germinates to become prothallus, i.e, the young ones of pteridophytes. So, the correct answer is option B.

Which of the following division of kingdom plantae and sub-kingdom cryptogamae can reproduce sexually by formation of gametes.

botany kingdom plantae introduction to pteridophytes cryptogams pteridophyta pteridophytes

  1. Thallophyta

  2. Bryophyta

  3. Pteridophyta

  4. All of above

Show answer
Correct Option: C
Explanation:

Pteridophyta is the only division of sub-kingdom cryptogamae that can reproduce both, sexually by formation of spores as well as sexually by formation of gametes.

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

Show answer
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.