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Multiple choice evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

The gymnosperm resembles with angiosperm in having

  1. Ciliated sperms

  2. Presence of ovary

  3. Presence of seed

  4. Presence of fruit
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gymnosperms and angiosperms are the phenerogames or spermatophytes. 

Phenerogams are the seed bearing plants. Gymnosperms are distinguished from angiosperms by having naked ovules and seeds. The ovules are not enclosed in an ovary and the seeds are not enclosed in a pericarp. 
In angiosperms or flowering plants, the seeds are enclosed in a fruit, and are known as "covered seeds".

Multiple choice evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

Endosperm in gymnosperms is

  1. Haploid and developed after fertilization

  2. Haploid and developed before fertilization

  3. Triploid and developed before fertilization

  4. Triploid and developed after fertilization
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gymnosperms are the most primitive of the seed plants. A seed comprises two parts: an endosperm, which nourishes the embryo, and the embryo itself, which is fed by the endosperm.

In gymnosperms the endosperm grows from a spore (a cell with half the number of chromosomes n). Pollination may occur when the cone is small, but the endosperm continues to grow to completion before fertilisation occurs. 

Multiple choice evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

How many generations found in seed of gymnosperm?

  1. 1

  2. 2

  3. 4

  4. 3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The sporophyte (2n) phase is the longest phase. The gametophytes (1n), microspores and megaspores, are reduced in size. This phase may take more than one year between pollination and fertilization, while the pollen tube grows towards the megasporocyte (2n), which undergoes meiosis into megaspores. The megaspores will mature into eggs (1n) .
Gymnosperm seed is made up of three generations of tissues. 
1) maternal sporophyte tissue (seed coat and nucellus), 
2) gametophyte 
3) daughter sporophyte (embryo)

Multiple choice evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

The characters of gymnosperms are

  1. Seeds are naked

  2. Fruits are absent

  3. True carpel absent

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gymnosperms were the first plants to have seeds. They are often referred to as having naked seeds because they do not have flowers and they develop on the surface of the reproductive structures of the plants rather than being contained in a specialized ovary. These seeds are often found on the surface of cones and short stalks.

Gymnosperms are a group of plants with the following unique characteristics:

  • They do not have an outer covering or shell around their seeds.
  • They do not produce flowers.
  • They do not produce fruits.
  • They are pollinated by the wind.

Multiple choice evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

Gymnosperms maintain their dominance over angiosperms in

  1. Colder regions of world

  2. Warmer regions of world

  3. Antarctica

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

Gymnosperms are more ancient than angiosperms. They formed dominant vegetation on the earth about 200 million years ago, and have been replaced by the angiosperms with the changing time and climatic conditions. They are now maintaining their dominance only in the colder regions, where instead of rain, snow is the source of water. Only a few gymnosperms, like cycads thrive in warm whether.

Multiple choice evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

The gymnosperms endosperm differs from an angiospermic endosperm because in gymnosperms it is

  1. Haploid and developed from female gametophyte

  2. Diploid and developed from female gametophyte

  3. Triploid and developed after fertilization

  4. Triploid and developed before fertilization
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gymnosperm endosperm is haploid because it is formed from the female gametophyte tissue before fertilization. In contrast, angiosperm endosperm is triploid and forms after fertilization via double fertilization.