Tag: classification of pteridophytes

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Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

In pteridophytes, the spores are formed in specialised leaves known as

  1. Sporophylls

  2. Spikes

  3. Inflorescece

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

Pteridophytes are vascular plants. Leaves called sporophylls produce clusters of capsular structures called sporangia that bears spores which germinate and yield gametophytes. Hence they show alternation of generations, in which a sporophyte produces spores through meiosis and a gametophyte forms gametes by mitosis. 

So, the correct answer is option A.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

 Horse tails are

  1. Lycopsida

  2. Pteropsida

  3. Psilopsida

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

The correct answer is 'Sphenopsida'

Horse tails are a type of fern which belongs to genus Equisetum which is the only genus present in the class Sphenopsida along with many extinct forms.
They have reduced leaves borne in a whorl like a pattern on nodes along with sporangiophore present with sporangia.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

One of the following is incorrect set of analogy amongst Selaginella and gymnosperms

  1. Megasporangium- nucellus of ovule

  2. Female prothallus- endosperm

  3. Ligule- carpellary scale

  4. Megasporophyll- female gametophyte
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Option D is mismatched as the sporangia in selaginella contain four very large yellow spores. These four are the result of meiosis from a single sporocyte. The spores are called megaspores because of their large size. This makes the sporangium a megasporangium and the sporophyll a megasporophyll.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Azolla is used in the cultivation of

  1. Maize

  2. Sorghum

  3. Wheat

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

Azolla is extensively grown in rice paddies to increase rice production by more than to 50%. Nitrogen is the single most limiting factor in rice cultivation, strongly affecting the crop yield. Azolla substantially increases the amount of nitrogen fertiliser available to growing rice and it is has been used for thousands of years as a green nitrogen fertiliser to increase rice production.

So, the correct answer is option D.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

 Club mosses are

  1. Lycopsida

  2. Pteropsida

  3. Psilopsida

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

The correct answer is 'lycopsida'

Lycopsida is a group of pteridophytes which consists of club mosses and several related extinct plants.
Pteropsida consists of vascular plants such as ferns .
Psilopsida consists of species of ferns such as ophioglossales.
Sphenopsida consists of horsetails/Equisetum.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

Rhizophore in Selaginella is

  1. A modified leaf

  2. A root

  3. A shoot

  4. Organ Sui generis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rhizophores is a  structure of controversial morphological nature.They are leafless and  positively geotropic organs that have localised origin and develop from angle meristems. Goebel and Bower considered them as Organs sui generis (i.e.,neither roots or shoots). According to J.C.Shoute,Organ sui generis is one that is a novelty and has not arisen as result of  metamorphosis of any organ.

Multiple choice classification of pteridophytes kingdom plantae plant kingdom biology

In Dryopteris, the sori are borne

  1. Laterally

  2. Abaxially

  3. Adaxially

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

In Dryopteris sori, a group of sporangia covered with indusium are present along the margin of pinnae or leaflets. In it 2-8 sori are borne on the abaxial surface of the mature fronds (sporophylls). They are situated in two rows at the tips of the veinlets in between the midrib and the margins. The sori appear reniform due to the kidney shaped protective thin and membranous covering, called as indusium.