Tag: phanerogams

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

Male and female gametophytes do not have free independent existence in 

  1. Pteris

  2. Cedrus

  3. Polytrichum

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

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

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

  1. Bryophytes

  2. Pteridophytes

  3. Gymnosperms

  4. Dicotyledonous plants
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  1. they are seedless

  2. they are not pollinated

  3. the process of fertilization does not occur

  4. they have no ovary
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Strobilanthes kunthiana flowers once in

  1. $5\ years$
  2. $12\ years$
  3. $20\ years$
  4. $50\ years$
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Strobilanthes kunthiana differs from bamboo in

  1. Being monocarpic

  2. Length of juvenile phase

  3. Being polycarpic

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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'. 

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Select the mismatched pair.

  1. Smallest angiosperm - Rafflesia

  2. Tallest angiosperm - Eucalyptus regnans

  3. Marine angiosperms - Zostera, Thalassia

  4. Angiosperm with smallest seed - Orchid

Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice biology classification of plants phanerogams gymnosperms angiosperms

Mature gymnosperms lack

  1. Seeds

  2. Leaves

  3. Flowers

  4. Vascular tissue

  5. Woody growth
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gymnosperms are seed-bearing plants but lack the specialized features  of flowering plants. The gymnosperms do not bear flowers hence the seeds are naked i.e these are not enclosed within fruits.