Tag: biology

Questions Related to biology

Which group possesses vessels in its xylem

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Pteridophytes

  2. Angiosperms

  3. Gymnosperms

  4. Both B and C

Show answer
Correct Option: B
Explanation:

Vessel members are the principal water-conducting cells in angiosperms (though most species also have tracheids) and are characterized by areas that lack both primary and secondary cell walls, known as perforations. Water flows relatively unimpeded from vessel to vessel through these perforations, though fractures and disruptions from air bubbles are also more likely. 

So, the correct answer is 'Angiosperms.'

An angiosperm lacking vessels is

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Trochodendron

  2. Acacia

  3. Salix

  4. Dendrocalamus

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Correct Option: A
Explanation:

Trochodendron is a genus of flowering plants with one living species, Trochodendron aralioides, and six extinct species known from the fossil record. Trochodendron aralioides is an evergreen tree or large shrub growing to 20 m tall. Trochodendron and Tetracentron lack vessel elements in their wood, a quite unusual feature in angiosperms. 

So, the correct answer is 'Trochodendron.'

An angiosperm having monarch xylem is?

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Casuarina

  2. Trapa

  3. Strychnos

  4. Urtica

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Correct Option: B

Dominance of angiosperms can be considered due to evolution of

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Seed

  2. Fruit

  3. Vascular system

  4. Extensive root system

Show answer
Correct Option: B
Explanation:
Global domination of any species depends on its ability to effectively reproduce. Thus, vascular system or extensive root system, though essential for survival, will not increase the population of the species. Angiosperms developed from gymnosperms or the plants with naked seeds, meaning that seeds evolved before the time of angiosperms. The presence of fruit makes angiosperms reproduce successfully by protecting the seeds and increasing their chances of survival.
So, the correct answer is 'Fruit'.

Angiosperm lacking vessels is

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Mangifera

  2. Dillenia

  3. Magnolia

  4. Drimys.

Show answer
Correct Option: D
Explanation:
Vessels are only found in xylem of angiosperm but exceptionally it is also present in some Gymnosperms like Ephedra, Gnetum and Welwitschia. Vessels are absent in some Angiospermic plants such as Dracaena, Yucca, Dazinaria, Drimys.
So, the correct answer is 'Drimys.'

Vessels and companion cells occur in

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Thallophytes

  2. Bryophytes

  3. Pteridophytes

  4. Angiosperms

Show answer
Correct Option: D
Explanation:

Sieve-tube members of angiosperms are associated by living companion cells. In contrast to gymnosperms where the vascular system only has tracheids, both tracheids and vessels occur as water-conducting cells in most angiosperms.  

So, the correct answer is 'Angiosperms.'

Given below are assertion and reason. Point out if both are true with reason being correct explanation (A), both are true but reason is not correct explanation (B), assertion true but reason is wrong (C) and both are wrong (D).
Assertion. In angiosperms, transport of food and water is more efficient than gymnosperms and pteridophytes
Reason. In angiosperms, longitudinally arranged sieve elements and vessels with perforated end walls are present

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. A

  2. B

  3. C

  4. D

Show answer
Correct Option: A
Explanation:
Gymnosperms and pteridophytes lack the two vascular structures i.e., vessels and sieve elements. In angiosperms presence of vessels and sieve elements in addition to all other vascular tissues make their food and water transport more efficient.
So, the correct answer is 'A.'

How do gymnosperms and angioperms differ from each other?

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Gymnosperms have naked seed but angiosperms have seed coat

  2. Gymnosperm have leaves but angiosperms do not have leaves

  3. Gymnosperms are seed bearing plant but seed is absent in angiosperm

  4. Both A and B

Show answer
Correct Option: A
Explanation:
Angiosperms, also called flowering plants, have seeds that are enclosed within an ovary and have a seed coat (usually a fruit), while in gymnosperms flowers or fruits are absent and the seeds are naked. So, they are also called naked seeds. These seeds are present on the surface of scales or leaves.
So, the correct answer is 'Gymnosperms have naked seed but angiosperms have seed coat'.

Angiosperms have all except

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Sieve cells

  2. Tracheids

  3. Sieve tubes

  4. Vessels

Show answer
Correct Option: A
Explanation:
A. Sieve cells are present in gymnosperms and pteridophytes and absent in angiosperms.
B. Tracheids are present in angiosperms, gymnosperms and pteridophytes.
C. Sieve tubes are present in angiosperms and absent in gymnosperms and pteridophytes.
D. Vessels are present in angiosperms and absent in gymnosperms and pteridophytes.
So, the correct option is 'Sieve cells'.

Double fertilisation and triple fusion events are unique to

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. $Algae$

  2. $Angiosperms $

  3. $Gymnosperms$

  4. $Pteridophytes$

Show answer
Correct Option: B
Explanation:

Triple fusion is the fertilization of the two polar nuclei in the embryo sac. It occurs during the double fertilization of angiosperms. While one sperm cell fertilizes the egg cell in the embryo sac, the other sperm cell fertilizes the two polar nuclei found in the central cell. So the correct option is 'Angiosperm'.