Tag: classification of pteridophytes

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Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Heteromorphic alternation of generations occurs in

  1. Dictyota

  2. Selaginella

  3. Rhizopus

  4. Spirogyra
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Heteromorphic alternation of generations refers to a life cycle where the sporophyte and gametophyte phases are morphologically distinct, which is characteristic of Selaginella.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

In Selaginella, the male gametes are

  1. Uniflagellate

  2. Biflagellate

  3. Non-flagellate

  4. Multiflagellate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The male gametes (antherozoids) of Selaginella are biflagellate, meaning they have two flagella to aid in swimming toward the archegonia.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Selaginella sperms swim towards archegonia. The phenomenon is

  1. Chemotaxis

  2. Chemotropism

  3. Chemonasty

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

Chemotaxis is the movement shown by organism in the direction of the external chemical stimuli. In Selaginella, sperm sense the chemoattractant and orient its swimming towards the archegnonia. Chemotropism is the growth movement shown by organism in the direction of the external chemical stimuli. Chemonasty is the nastic movement shown by organism in response to the external chemical stimuli. Spermatozoa can sense this chemoattractant and orient their swimming direction up the concentration gradient towards the egg cell located in the venter of archegonia

So, the correct answer is 'Chemotaxis'

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Which of the following are heterosporous pteridophytes?
I. Lycopodium   II. Selaginella   III. Equisetum   IV. Salvinia

  1. I and II

  2. II and III

  3. III and IV

  4. II and IV

  5. I and IV
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Heterosporous pteridophytes produce two types of spores (microspores and megaspores). Selaginella and Salvinia are classic examples of heterospory.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Integument like covering of megasporangium occurs in Selaginella

  1. S. apus

  2. S. rupestris

  3. S. sulcata

  4. S. yemensis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A) S. apus
The sporophyte is herbaceous. The shoot is dorsiventral and radial and creeping or erect. An ovule consists of a megasporangium, is surrounded by a single covering or integument, and eventually will become a seed.
Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Megaspores are retained inside megasporogonium for germination in species of Selaginella

  1. S.bryopteris and S.lepidophylla

  2. S.chrysocaulos and S.subdiaphana

  3. S.selaginoides and S.kraussiana

  4. S.apus and S.rupestris
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In S. bryopteris and S. lepidophylla, megaspores are retained inside the megasporangium (not megasporogonium, which appears to be a typographical error in the question) for germination. This retention of megaspores is a step toward seed habit and occurs in specific Selaginella species. The other species pairs listed are known to release megaspores externally.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Ptyxis is

  1. Arrangement of leaves on the stem

  2. Arrangement of leaves in the bud

  3. Folding of lamina in bud

  4. Both B and C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The folding of lamina in bud condition is called as ptyxis. Arrangement of leaves on the stem branches is called as phyllotaxy. Vernation is the phenomenon of arrangement of leaves in the bud. 

Thus, the correct answer is 'Folding of lamina in bud.'

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Tracheophyta characterised by habitual heterophylly, absence of companion cells and presence of vessels in xylem is

  1. Pteris

  2. Drimys

  3. Selaginella

  4. Gnetum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Selaginella is a tracheophyte that exhibits heterophylly (different leaf sizes), lacks companion cells (typical of pteridophytes), and has vessels in its xylem, which is an advanced trait.