Tag: pictorial feature of plant kingdom

Questions Related to pictorial feature of plant kingdom

Fruits are not formed in gymnosperms, because

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. Fertilization is absent

  2. Pollination is absent

  3. Seeds are not formed

  4. Ovary is absent

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Correct Option: D
Explanation:

Fruits are not formed in gymnosperms due to absence of ovary. The ovules of a gymnosperm do not develop in an ovary but are "naked". Seeds develop from the ovules that are found in the developed ovaries but in the case of gymnosperms, the ovules are located directly on the surface of the flower or cone. 

The gymnosperm resembles with angiosperm in having

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. Ciliated sperms

  2. Presence of ovary

  3. Presence of seed

  4. Presence of fruit

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Correct Option: C
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".

Endosperm in gymnosperms is

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. Haploid and developed after fertilization

  2. Haploid and developed before fertilization

  3. Triploid and developed before fertilization

  4. Triploid and developed after fertilization

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Correct Option: B
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. 

How many generations found in seed of gymnosperm?

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. 1

  2. 2

  3. 4

  4. 3

Show answer
Correct Option: D
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)

The characters of gymnosperms are

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. Seeds are naked

  2. Fruits are absent

  3. True carpel absent

  4. All of the above

Show answer
Correct Option: D
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.

Gymnosperms maintain their dominance over angiosperms in

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. Colder regions of world

  2. Warmer regions of world

  3. Antarctica

  4. Oceans

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Correct Option: A
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.

Dwarf shoot of Pinus is

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. Shed every year

  2. Shed after 2 - 3 years

  3. Shed after five years

  4. Never shed

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Correct Option: B

In gymnosperms how many male gametes are produced by each pollen grain?

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. $4$

  2. $3$

  3. $2$

  4. $1$

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Correct Option: C

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

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  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

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Correct Option: A

Vascular plants lacking vessels and companion cells are

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. Angiosperms

  2. Thallopohytes

  3. Bryophytes

  4. Gymnosperms

Show answer
Correct Option: D