Tag: gymnosperms

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Questions Related to gymnosperms

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Consider the following statements with respect to angiosperms.
(a) Male sex organ in a flower is the stamen
(b) Anthers following mitosis produce pollen grains
(c) In an embryo sac, the primary endosperm nucleus (PEN) is diploid
(d) After double fertilization, ovules develop into seeds and ovaries into fruits
Of the above statements

  1. (c) and (d) are correct

  2. (a) and (b) are correct

  3. (a) and (c) are correct

  4. (a) and (d) are correct

  5. (b) and (c) are correct
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statement (a) is correct as the stamen is the male reproductive organ. Statement (d) is correct as ovules become seeds and ovaries become fruits. Statement (c) is incorrect because the PEN is triploid (3n), not diploid.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Read the following statements.
(a) Angiosperms range in size from microscopic Wolffia to tall trees of Eucalyptus
(b) In angiosperms, the seeds are enclosed by fruits
(c) Double fertilization is an event unique to angiosperms
(d) In angiosperms, each cell of embryo sac is diploid
(e) In angiosperms, the zygote develops into an endosperm
Of the above statements, the correct ones are

  1. $a, b$ and $d$
  2. $a, b$ and $e$
  3. $a, b$ and $c$
  4. $b, c$ and $d$
  5. $b, c$ and $e$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statements (a), (b), and (c) are correct. Statement (d) is false because cells in the embryo sac are haploid (except the central cell). Statement (e) is false because the zygote develops into an embryo, not endosperm.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

In grasses, the ligule occurs

  1. At leaf base

  2. Between leaf base and lamina

  3. Between leaf base and petiole

  4. Between petiole and lamina
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 A ligule is an outgrowth present at the junction of leaf sheath and lamina in grasses. It occurs at the end of petiole at the leaf base. It is a strap-shaped extension of the corolla. It is a membranous appendages.

Thus, the correct answer is 'At leaf base.'

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Seed leaf is

  1. Leaf present over the plumule

  2. Colyedon

  3. Coleoptile

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

The seed coat encloses an embryo wich is differentiated into radicle (give rise to primary root), plumule(give rise to aerial shoot) and cotyledons (seed leaves). The number of cotyledons may be one or two. These are different from foliage leaves. Some times they store reserve food materials or serve as photosynthetic organs in young seedling. The plumule is surrounded by a conical protective sheath, called coleoptile.

So, the correct answer is 'Cotyledon'.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

In monocots

  1. Leaves have reticulate venation

  2. Stems have annual rings

  3. Seed have two storage organs

  4. Stems have scattered conducting strands
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A. Leaves have reticulate venation – dicotyledons

B. Stems have annual rings – dictyledons

C. Seed have two storage organs -dicotyledons

D. Stems have scattered conducting strands – monocotyledons

So, the correct option is ‘stems have scattered conducting strands’.    

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

A monocot showing reticulate venation is

  1. <p>Bombusa</p>

  2. <p>Smilax</p>

  3. <p>Callophyllum</p>

  4. <p>Ginkgo</p>
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Smilax is an economically important monocotyledonous flowering plant belonging to family Liliaceae. It is found in tropics and subtropics worldwide. They are climbing flowering plants, many of which are woody and thorny. Usually, monocots show parallel venation (veins present in the leaf are arranged parallel to each other), but Smilax shows reticulate venation (veins are interconnected and forms web-like structure). So, the correct answer is 'Smilax'.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Tigellum is

  1. Embryonic axis

  2. Embryonic root

  3. Embryonic shoot

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

The cotyledons are attached to the curved embryonal axis (Tigellum) at the cotyledonary node. The ,micropylar end of embryonal axis is rod- shaped and slightly bulged. It is called radicle (or embryonic root). The other side of embryonal axis lies in between the two cotyledons. It is called plumule( or the shoot tip).

So, the correct answer is 'Embryonic axis'.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Oil yielding plants are abundant in the family

  1. Solanaceae

  2. Ranunculaceae

  3. Cruciferae

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

Most of the oil yielding plants belong to the family Cruciferae.

Seeds of these plants bear a high amount of oil which is important for an economical perspective. 
So the correct option is C.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Embryo sac of angiosperms contains.

  1. $3$- celled egg apparatus, $3$ antipodal cells and $2$ polar nuclei
  2. $2$- celled egg apparatus, $3$ antipodal cells and $2$ polar nuclei
  3. $3$- celled egg apparatus, $2$ antipodal cells and $1$ polar nucleus
  4. $3$- celled egg apparatus, $1$ antipodal cell and $2$ polar nuclei
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The typical mature embryo sac (Polygonum type) consists of an egg apparatus (2 synergids + 1 egg cell), 3 antipodal cells, and 2 polar nuclei in the central cell.