Tag: biology

Questions Related to biology

In Selaginella, the male gametes are

classification of pteridophytes kingdom plantae plant kingdom biology

  1. Uniflagellate

  2. Biflagellate

  3. Non-flagellate

  4. Multiflagellate

Show answer
Correct Option: B

A pteridophyte having pyrenoid in its chloroplasts is

classification of pteridophytes kingdom plantae plant kingdom biology

  1. Pteridium

  2. Selaginella

  3. Equisetum

  4. Marsilea

Show answer
Correct Option: B

Selaginella sperms swim towards archegonia. The phenomenon is

classification of pteridophytes kingdom plantae plant kingdom biology

  1. Chemotaxis

  2. Chemotropism

  3. Chemonasty

  4. Thigmonasty

Show answer
Correct Option: A
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'

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

classification of pteridophytes kingdom plantae plant kingdom biology

  1. I and II

  2. II and III

  3. III and IV

  4. II and IV

  5. I and IV

Show answer
Correct Option: D

Integument like covering of megasporangium occurs in Selaginella

classification of pteridophytes kingdom plantae plant kingdom biology

  1. S. apus

  2. S. rupestris

  3. S. sulcata

  4. S. yemensis

Show answer
Correct Option: A
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.

Megaspores are retained inside megasporogonium for germination in species of Selaginella

classification of pteridophytes kingdom plantae plant kingdom biology

  1. S.bryopteris and S.lepidophylla

  2. S.chrysocaulos and S.subdiaphana

  3. S.selaginoides and S.kraussiana

  4. S.apus and S.rupestris

Show answer
Correct Option: A

Ptyxis is

classification of pteridophytes kingdom plantae plant kingdom biology

  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

Show answer
Correct Option: C
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.'

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

classification of pteridophytes kingdom plantae plant kingdom biology

  1. Pteris

  2. Drimys

  3. Selaginella

  4. Gnetum

Show answer
Correct Option: C

Which one does not occur in Selaginella?

classification of pteridophytes kingdom plantae plant kingdom biology

  1. Heterospory

  2. Heterophylly

  3. Homospory

  4. Ligulate leaves

Show answer
Correct Option: C

Which is not a bryophyta?

classification of pteridophytes kingdom plantae plant kingdom biology

  1. Hepaticopsida

  2. Anthocerotopsida

  3. Bryopsida

  4. Lycopsida

Show answer
Correct Option: D