Tag: gymnosperms

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Questions Related to gymnosperms

Multiple choice gymnosperms pictorial feature of plant kingdom biology

Read the following five statements (A - E) and answer as asked next to them.
(A) In Equisetum the female gametophyte is retained on the parent sporophyte
(B) In Ginkgo male gametophyte is not independent
(C) The sporophyte in Riccia is more developed than that in Polytrichum
(D) Sexual reproduction in Volvox is isogamous
(E) The spores of slime molds lack cell walls
How many of the above statements are correct ?

  1. Three

  2. Four

  3. One

  4. Two
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The spore of Equisetum germinate shortly after shedding and gives rise to form prothallus. Prothalli of Equisetum are basically monoecious and the gametophytes are rarely seen. The simplest known sporophyte among bryophytes is that of Riccia while highest evolved known is Bryopsida (Polytrichum, Pdgonatum). Sexual reproduction in Volvox is oogamous type. The spores in slime molds (e.g., Physarum) are haploid, unicellular, usually globose with smooth, spiny or reticulately thickened cell walls.

So, the correct answer is 'One'.
Multiple choice gymnosperms pictorial feature of plant kingdom biology

Which well-known tree is known in Britain as Wellingtonia?

  1. Elm

  2. Oak

  3. Giant sequoia

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

Sequoiadendron giganteum is the sole living species in the genus Sequoiadendron. Giant sequoia specimens are the most massive trees on Earth.The name "Wellingtonia" has persisted in England as a common name, also known as giant redwood, sierra redwood, sierran redwood, Wellingtonia  or simply big tree.

So, the correct option is C. ( giant sequoia )

Multiple choice gymnosperms pictorial feature of plant kingdom biology

Gymnosperm with mycorrhiza is present in

  1. Cycas

  2. Casuarina

  3. Pinus

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

Roots in some genera of gymnosperms have fungal associations in form of mycorrhiza which is associated with N$ _2$ fixing cyanobacteria. For example, pinus.

So, the correct answer is 'Pinus'.

Multiple choice gymnosperms pictorial feature of plant kingdom biology

Both conifers and Cycas have?

  1. Motile sperms

  2. Non-motile sperms

  3. Motile & non-motile sperms respectively

  4. Non motile & motile sperms respectively
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Conifers have non-motile sperm that needs to be moved along the pollen tube.
  • Cycads have motile sperm with flagella (they have multiple flagella) that help them move to the egg along the pollen tube.
So, the correct option is 'Non-motile & motile sperms respectively'.

Multiple choice gymnosperms pictorial feature of plant kingdom biology

In gymnosperms pollination is exclusively by?

  1. Animals

  2. Wind

  3. Water

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

Gymnosperms are seed plants that lack flowers, relying primarily on wind for pollination. Wind pollination ensures efficient transfer of pollen from male to female cones over large distances. Animals and insects are typically involved in angiosperm pollination.

Multiple choice gymnosperms pictorial feature of plant kingdom biology

Progymnosperms were evolved in?

  1. Ordovician period

  2. Silurian period

  3. Devonian period

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

Progymnosperms are an extinct group of vascular plants that evolved from trimerophytes and served as precursors to seed plants and conifers. Fossil evidence indicates that they first appeared and diversified during the Devonian period. They are characterized by having fern-like foliage and secondary wood.

Multiple choice gymnosperms pictorial feature of plant kingdom biology

Conifers are related to

  1. Match industry

  2. Paper industry

  3. Timber industry

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The wood of several Gymnosperms, particularly those of conifers is used in paper industry. Conifers wood is used as a structural timber and for making furniture.

Multiple choice gymnosperms pictorial feature of plant kingdom biology

Conifer gymnosperms can never be____________.

  1. Vines

  2. Herbs

  3. Annuals

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Conifers that belong to the largest and the economically most important component group of the gymnosperms and are known to consists of both living and fossil taxa. Represented by a number of species, the stems of conifers are composed of a woody axis containing primitive water- and mineral-conducting cells- tracheids. All living conifers are woody plants, and mostly evergreen trees, with a monopodial growth form.