Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany pictorial feature of plant kingdom classification of bryophytes types of bryophytes bryophyta

Largest moss is

  1. Pogonatum

  2. Funaria

  3. Dawsonia

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

Dawsonia is a genus of acrocarpous mosses that includes the tallest and largest self-supporting mosses in the world. Specifically, Dawsonia superba can grow up to 50 to 60 cm in height, which is exceptionally large for a bryophyte. Other genera like Funaria and Pogonatum are much smaller.

Multiple choice botany pictorial feature of plant kingdom classification of bryophytes types of bryophytes bryophyta

Sex organs of Anthoceros are

  1. Terminal

  2. Borne over dorsal surface of thallus

  3. Embedded

  4. Formed over gametophores
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the hornwort Anthoceros, the sex organs (antheridia and archegonia) are deeply embedded within the dorsal tissue of the gametophytic thallus. They develop from hypodermal cells and do not project outward on stalks or specialized gametophores, unlike in many liverworts.

Multiple choice botany pictorial feature of plant kingdom classification of bryophytes types of bryophytes bryophyta

In mosses gametophyte has $2$ stages. What are these stages?

  1. $1st$ stage is sporogonium phase and $2nd$ protonema stage
  2. $1st$ stage is protonema and the $2nd$ stage is leafy stage
  3. $1st$ stage is gemmae formation and $2nd$ one is meiosis.
  4. $1st$ stage is zygote and $2nd$ one is Spore mother cell
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In mosses, the gametophyte generation develops in two stages: the first stage is the creeping, filamentous protonema, and the second stage is the upright, leafy gametophore stage that develops from buds.

Multiple choice botany pictorial feature of plant kingdom classification of bryophytes types of bryophytes bryophyta

Mosses are gregarious in nature, because?

  1. They show independent alternation of generation

  2. They appear in group

  3. They show haplo-diplontic life cycle

  4. Their antherozoids are biflagellate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The term gregarious in biology refers to organisms that live, grow, or appear close together in groups, forming mats or clumps. Mosses often grow in dense patches or carpets, making them gregarious in nature.

Multiple choice botany pictorial feature of plant kingdom classification of bryophytes types of bryophytes bryophyta

The sporophyte in mosses is?

  1. Less elaborate than that in liverworts

  2. More elaborates than that in liverworts

  3. Equally elaborate in both

  4. Independent of gametophyte
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mosses have a more developed, complex sporophyte compared to liverworts, featuring features like a differentiated capsule and peristome teeth. Liverwort sporophytes are typically simpler and less elaborate. Thus, the moss sporophyte is more elaborate.

Multiple choice botany pictorial feature of plant kingdom classification of bryophytes types of bryophytes bryophyta

Elaters are present in the sporogonium of

  1. Riccia

  2. Selaginella

  3. Marchantia

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

Elaters are present in hepaticopsida (marchantia). Pseudoelators are present in Anthocerotopsida. Single layered capsule wall splits into a number of longitudinal valves, which extend from apex towards the middle of capsule. The valves are rolled back due to annular thickenings in jacket cells. Jerky movement of elaters due to their hygroscopic nature leads to loosening up of spore mass and scattering of spores in air.