Tag: classification of pteridophytes

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Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Selaginella and Salvinia are considered to represent a significant step toward the evolution of seed habit because 

  1. Embryo develops in female gametophyte which is retained on parent sporophyte

  2. Female gametophyte is free and gets dispersed like seeds

  3. Female gametophyte lacks archegonia

  4. Megaspore possess endosperm and embryo surrounded by seed coat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Genera like Selaginella and Salvinia which produce two kinds of spores, macro (large) and small (micro) spores are known as heterosporous. Microspore and macrospore germinate and gives rise to male and female gametophyte respectively. The female gametophytes in these plants are retained on the parent sporophyte for a variable period. The development of the zygote into young embryo takes place within the female gametophytes. This event is a precursor to the seed habits considered an important step in evolution. So, the correct answer is 'Embryo develops in female gametophyte which is retained on parent sporophyte'.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Spindle shaped male gametes are found in

  1. Lycopodium

  2. Pteris

  3. Pteridium

  4. Selaginella
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Selaginella is a pteridophyte also known as spike moss or little club moss. It is a tropical plant. It has world wide distribution. It grows in damp forests. Some species occur in temperate regions. They grow in moist shady places. In Selaginella male gametes are spindle shaped and biflagellate. Hence option D is correct.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Selaginella has a tendency to form seed, called seed habit, because it follows 

  1. Retention of megaspore permanently inside the megasporangium

  2. Heterospory

  3. Both above characters

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Selaginella is a genus of primitive vascular plants in the family Selaginellaceae. Selaginella has a tendency to form seed because the retention and germination of single megaspore within megasporangium to form a female gametophyte led to the phenomenon of seed habit, a characteristic feature of spermatophytes.

So, the correct answer is 'Retention of megaspore permanently inside the megasporangium'.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

The evolutionary advanced features of Selaginella are :
(a) Heterospory
(b) Endosporic development of gametophyte.
(c) Reduced gametophyte
(d) Localization of sporangium bearing appendages in strobili.
(e) Unisexual gametophytes
(f) fertilization with the help of water.

  1. All are correct

  2. All expect (f) are correct

  3. All expect (e) and (f) are correct

  4. All expect (c) is correct.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Selaginella exhibits heterospory, endosporic development, reduced gametophytes, and strobilus formation, which are considered advanced evolutionary traits in pteridophytes.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Rudimentary seed habit is found in

  1. Selaginella

  2. Lycopodium

  3. Equisetum

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

Rudimentary seed habit means plants are reproducing sexually by seed but it is not fully developed. For e.g. in Selaginella female gametophytes are retained on the parent sporophytes for different periods. Within the female gametophytes, the development of the zygote into young embryos takes place. This event is a very important step in evolution as a precursor to seed habit. 

So the correct option is 'Selaginella'.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Arrangement of leaves in the bud condition is called _________.

  1. Phyllotaxy

  2. Insertion

  3. Ptyxis

  4. Vernation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Arrangement of leaves on the stem branches is called as phyllotaxy. 
Insertion is the angle and orientation of the leaves with respect to the axis of the stem. 
The folding of lamina in bud condition is called as ptyxis. 
Vernation is the phenomenon of arrangement of leaves in the bud condition.
Thus, the correct answer is 'Vernation.'
Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Which one of the following is not a correct statement ?

  1. Herbarium houses dried, pressed and preserved plant specimens

  2. Botanical gardens have collection of living plants for reference

  3. A museum has collection of photographs of plants and animals

  4. Key is a taxonomic aid for identification of specimens
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Museum is the collection of dead and preserved specimen of animals generally.
So, the correct answer is 'A museum has collection of photographs of plants and animals'
Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Heterosporous pteridophytes (e.g., Selaginella) always produce ................ gametophytes

  1. Monoecious

  2. Dioecious

  3. Homothallic

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Heterosporous pteridophytes (e.g., Selaginella) always produce dioecious gametophytes. A heterosporous life history occurs in some pteridophytes and in all seed plants. It is characterized by morphologically dissimilar spores produced from two types of sporangia: microspores, or male spores, and megaspores (macrospores), or female spores. In pteridophytes, megaspores are typically larger than microspores, but the opposite is true in most seed plants.