Tag: gymnosperms

Questions Related to gymnosperms

Both pteridophytes and gymnosperms possess 

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. Ovules

  2. Seeds

  3. Archegonia

  4. Independent gametophyte

Show answer
Correct Option: C

Male and female gametophytes do not have free independent existence in 

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. Pteris

  2. Cedrus

  3. Polytrichum

  4. Funaria

Show answer
Correct Option: B
Explanation:

Cedrus is a gymnosperm. In gymnosperms, male and female gametophytes do not have free independent existence. They remain within the sporangia retained on the sporophytes. 

Thus, the correct answer is option B.

Choose the correct answers from the alternatives given.
In which one of the following groups would you place a plant which produces seeds but lacks fruits

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. Bryophytes

  2. Pteridophytes

  3. Gymnosperms

  4. Dicotyledonous plants

Show answer
Correct Option: C
Explanation:

The gymnosperms are the plants in which the ovules are not enclosed by an ovary wall and remain exposed, both before and after fertilization. This is that developers fertilization are not covered that is they are naked.


So, the correct option is gymnosperm.

Choose the correct answers from the alternatives given.
Gymnosperms generally lack

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. xylem vessels and companion cells in phloem

  2. xylem tracheids and sieve tubes in phloem

  3. xylem vessels and sieve tubes in phloem

  4. xylem tracheids and companion cells in phloem

Show answer
Correct Option: A
Explanation:

Gymnosperm generally lacks xylem vessels and companion cells in phloem as it grows in a cold and dry climate and they didn't evolve to have vessels and vessels are considered as advanced elements of xylem. And companion cells in phloem assist active transport of minerals which is absent in Gymnosperm.

So, the correct answer is 'xylem vessels and companion cells in phloem'.

Choose the correct answers from the alternatives given.
Fruits are not formed in gymnosperms because:

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. they are seedless

  2. they are not pollinated

  3. the process of fertilization does not occur

  4. they have no ovary

Show answer
Correct Option: D
Explanation:

Gymnosperms have no ovary, they can never produce fruit.  

Seeds develop from the ovules which are found in the developed ovaries or fruit, but in the case of gymnosperms, the ovules are located directly on the surface of the flower or cone.  Yews and ginkgoes develop fruit-like structures, but their seed is not inside these organs, which makes them gymnosperms.
So the correct answer is 'They have no ovary'.

Strobilanthes kunthiana flowers once in

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. $5\ years$

  2. $12\ years$

  3. $20\ years$

  4. $50\ years$

Show answer
Correct Option: B
Explanation:

Strobilanthes kunthiana (Neelakurinji) flower once in $12\ years$, its juvenile phase is very long. The last time this plant flowered during September-October $2006$. It is found in hilly area of Kerala, Karnataka and Tamil Nadu and attracts a large number of tourists due to mass flowering.

So, the correct answer is '12 years'.

Which of the following is a vessel less angiosperm?
biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Tetracentron

  2. Trochodendron

  3. Wintera

  4. All of these

Show answer
Correct Option: D
Explanation:

Vessel less angiosperms are: 

(i) Tetracentron
(ii) Trochodendron
(iii) Wintera
So, the correct answer is (d).

Strobilanthes kunthiana differs from bamboo in

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Being monocarpic

  2. Length of juvenile phase

  3. Being polycarpic

  4. None of these

Show answer
Correct Option: B
Explanation:

Bamboo can be monocarpic or polycarpic whereas Strobilanthes kunthiana is a monocarpic plant. The juvenile phase of bamboo can vary from 3-120 years and the juvenile phase of Strobilanthes kunthiana can vary from 8-16 years.

So, the correct option is 'Length of juvenile phase'. 

In angiosperms various stages of reductional division can best be studied in _____.

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Young anthers

  2. Mature anthers

  3. Mature ovules

  4. Endosperm cells

Show answer
Correct Option: A
Explanation:

Meiosis takes place in reproductive organs of plants and young anthers are the best material to study meiosis.

Select the mismatched pair.

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Smallest angiosperm - Rafflesia

  2. Tallest angiosperm - Eucalyptus regnans

  3. Marine angiosperms - Zostera, Thalassia

  4. Angiosperm with smallest seed - Orchid 

Show answer
Correct Option: A
Explanation:

Smallest angiosperm is Wolffia microscopici, while Rafflesia arnoldii is the parasitic plant with the world's largest flower.

So the correct option is A.