Tag: biology

Questions Related to biology

Plant body of Funaria is

examples of bryophytes plant kingdom biology

  1. Completely sporophyte

  2. Completely gametophyte

  3. Predominantly sporophyte with gametophyte

  4. Predominantly gametophyte with sporophyte

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Correct Option: D

Gemmae are the specialized structures produced in liverworts. These are ____________________.

examples of bryophytes plant kingdom biology

  1. non-green, multicellular, asexual buds which develop in gemma cups

  2. green, multicellular asexual buds which develop in gemma cups

  3. non-green, multicellular, diploid, sexual spores

  4. green, unicellular, diploid, sexual spores

Show answer
Correct Option: B
Explanation:

Gemmae are green multicellular asexual buds, which develop in small receptacles called gemma cups located on the thalli. Gemmae become detached from the parent body and germinate to form new individuals.

So the correct option is B.

The sporophytic phase in Funaria is well developed and composed of ________________.

examples of bryophytes plant kingdom biology

  1. Capsule only

  2. Spore sac

  3. Foot and capsule

  4. Foot, seta and capsule

Show answer
Correct Option: D
Explanation:

Sporophyte of Funaria has embedded foot, an elongated curved seta and a terminal pyriforrn capsule. Sporophyte is nutritionally dependent on gametophyte.

So the correct option is D.

Gemmae are multicellular green structures for vegetative propagation. These are found inside gemma cups in _________________.

examples of bryophytes plant kingdom biology

  1. Riccia capsule

  2. Marchantia thallus

  3. Funaria protonema

  4. Polytrichum thallus

Show answer
Correct Option: B
Explanation:

In Marchantia, the plant body consists of a dorsoventrally flattened, prostrate and dichotomously branched thallus. The thalli are conspicuous, the apex of each thallus is notched. Along the mid-rib are present characteristic, prominent goblet or cup-shaped structures, the gemma cups, with smooth, dentate or frilled margins. These cups enclose asexual reproductive bodies called gemma.So the correct option is B.

Asexual reproduction in liverworts takes place by ____________________.

examples of bryophytes plant kingdom biology

  1. Fragmentation of thalli and gemmae formation

  2. Gemmae formation and diploid spore formation

  3. Spores formation and isogamy

  4. Fragmentation and zoospore formation

Show answer
Correct Option: A
Explanation:

Asexual reproduction in liverworts takes place by fragmentation of thalli, or by the formation of specialised structures called gemmae.

So the correct option is A.

Gemmae are asexual reproductive bodies of  ___________.

examples of bryophytes plant kingdom biology

  1. brown algae

  2. mosses

  3. liverworts

  4. red algae

Show answer
Correct Option: C
Explanation:

Asexual reproduction in liverworts takes place by fragmentation of thalli, or by the formation of specialised structures called gemmae.

So the correct option is C.

Which of the following is least likely to occur along the sea coast?

examples of bryophytes plant kingdom biology

  1. Green algae

  2. Brown algae

  3. Red algae

  4. Mosses

Show answer
Correct Option: D
Explanation:

Mosses occupy a wide range of habitats. Mosses are typically found in moist environments although most species can withstand prolonged periods of desiccation. In terrestrial ecosystems, Mosses are important in preventing soil erosion. Numerous species of Moss are found in fresh water but there are no salt water species.

Statement A: The sexual reproduction in Funaria is of ooganous type.
Statement B: Pteridophytes also show oogamous type of sexual reproduction.

examples of bryophytes plant kingdom biology

  1. Only statement (A) is correct

  2. Only Statement (B) is correct

  3. Both statements (A) and (B) are correct

  4. Both statements (A) and (B) are incorrect

Show answer
Correct Option: D

In Funaria, the haploid structure is ______________.

examples of bryophytes plant kingdom biology

  1. protonema

  2. capsule

  3. columella

  4. seta

Show answer
Correct Option: A
Explanation:

Funaria exhibits gametophytic (n) as well as sporophytic (2n) generation in its life cycle. The gametophytic (haploid) generation is represented by a short-lived protonema which produces spermatozoids in antheridium of male shoot and egg in archegonium of the female shoot.

So the correct option is A.

The two layers of teeth in peristome of a moss are

examples of bryophytes plant kingdom biology

  1. Parts which help in the gradual dispersal of spores, the upper teeth are hygroscopic and open out only in dry weather. The lower one check sudden dispersal.

  2. Decorative parts functioning like sepals and petals in a flower.

  3. Parts which help in the discharge of spores only when the capsule matures. After the operculum falls they dry up and open out.

  4. Parts which help in the dispersal of spores. They are not hygroscopic and allows the discharge of spore disintegration of capsule wall.

Show answer
Correct Option: A
Explanation:

Peristome (exposed) plays an important role in the dispersal of spores. The peristome teeth by their hygroscopic movements help in the discharge of the spores. The inner peristome simply functions as a sieve. The spores are liberated in the dry weather and are carried out by air.