Tag: gymnosperms

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Questions Related to gymnosperms

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

How many generations are present in the seed of gymnosperms?

  1. $2$
  2. $3$
  3. $1$
  4. $4$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Unlike bryophytes and pteridophytes, in gymnosperm, the male and female gametophytes don't have an independent free-living existence. They remain attached to the sporophytes. After fertilization, these developed into an embryo and the ovule into seeds. Seeds are not covered. So 3 generation live inside one seed of gymnosperm- the embryo and the female gametophytic tissue and the seed coat and the nucellus which is the female sporophytic tissue.

So, the correct option is '3'

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

Choose the correct answers from the alternatives given.
Ovules are not found enclosed within ovary in

  1. gymnosperms

  2. spermatophytes

  3. dicotyledons

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

Gymnosperms are seed-bearing vascular plants like cycads, conifers, yews and ginkgo in which the ovules are not enclosed in an ovary. So, the ovules are called naked. 

Hence, the correct answer is 'gymnosperms'.

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

Choose the correct answers from the alternatives given.
Which one of the following characteristics can be used to distinguish gymnosperms from angiosperms?

  1. Presence of pollen chamber in gymnosperms

  2. Presence of naked ovules in gymnosperms

  3. Presence of stomata in angiosperms

  4. Absence of naked ovules in gymnosperms
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gymnosperms are the plants in which the ovules are not covered by an ovary, and the plant does not bear flowers. The seeds are naked.

So, the correct option is 'Presence of naked ovules in gymnosperms'

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

Which of the following is correct?

  1. ln Pinus pollen grain are developed inside the megasporangia

  2. Coralloid roots are associated with Frankia

  3. Male and female cones are borne on the same tree in Pinus

  4. In Cycas the pinnate leaves persist for upto only few days
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A cone is a structure present on conifers that contain the reproductive organs. The male and female cones are borne on the same tree in Pinus.

So, the correct answer is 'Male and female cones are borne on the same tree in pinus'.
Multiple choice evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

Which of the following is the best evidence that gymnosperms have descended from pteridophytes?

  1. Some gymnosperms have ciliated sperms

  2. They have cones

  3. They have evergreen

  4. Some gymnosperms cannot bear fruit
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gymnosperms and angiosperms, sperm cells have no cilia. All other motile land plant sperm cells are released into the environment.

So, the correct option is 'Some gymnosperms have ciliated sperms'.


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

A female gymnospermic plant has the genotype TT which pollinates another gymnosperms with the genotype tt. As a result of fertilization what will be the genotype of embryo and endosperm respectively?

  1. Tt, T

  2. Tt, TTt

  3. tt, Tt

  4. TTt, Tt
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The endosperm is the storage tissue in the seeds of gymnosperms.
  • The genotype obtained in the $F _1$ generation will be Tt, when a homozygous gymnospermic plant (TT) is crossed with another (tt).
  • Thus, the embryo being diploid in nature will have the genotype Tt.
  • Whereas, the genotype of the endosperm will be TTt because it is triploid in nature. 
Multiple choice evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

The total number of species belonging to present day gymnosperms is about

  1. 2000

  2. 850

  3. 2500

  4. 4000
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The total number of living gymnosperms of the world is about 850 species, belonging to 79 genera of 15 families. Although the number of species of gymnosperms accounts for only 0.36% of that of the angiosperms, they have formed large areas of various kinds of coniferous forests and are widely distributed all over the world, especially on mountains from middle to alpine latitudinal zones in cold-temperate and subtropical latitudes of the Northern hemisphere.

Therefore, the correct answer is option B.

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

Sieve cells can be traced in

  1. Dicots and monocots

  2. Monocots

  3. Gymnosperms and pteridophytes

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

Sieve cells can be traced in gymnosperms and pteridophytes. Sieve cells are typically associated with gymnosperms because angiosperms have the more derived sieve tube members and companion cells in their phloem. They have a narrower diameter and are more elongated compared to sieve tube members. Sieve cells are associated with albuminous cells, which lack starch thus, making it possible to differentiate them from phloem parenchyma.
Therefore, the correct answer is option C.

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

The resin duct of Gymnosperm is an example of

  1. Intracellular space

  2. Schizogenous cavity

  3. Lysigenous cavity

  4. Vacuole containing stored material
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The resin duct in Gymnosperms are formed by separation of cells to form a cavity. The cells surrounding this cavity secrete resin into the cavity. Resin is aromatic and prevents infection. 

So, the correct answer is 'Schizogenous cavity'