Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

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.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Occurrence of triploid primary endosperm nucleus is characteristic of.

  1. Algae

  2. Bryophytes

  3. Gymnosperms

  4. Angiosperms
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The primary endosperm nucleus is formed by the fusion of two polar nuclei and one male gamete, resulting in a triploid (3n) state, which is unique to angiosperms.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

In angiosperms the number of meiotic divisions required to produce $100$ macrospores is?

  1. $125$
  2. $100$
  3. $50$
  4. $25$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Each meiotic division of a megaspore mother cell produces 4 megaspores. To produce 100 functional megaspores (assuming one per division), you need 100 meiotic divisions.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

External water is not required for fertilization of

  1. Pteriodophytes

  2. Bryophytes

  3. Thallophytes

  4. Spermatophytes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Spermatophytes (seed plants, including gymnosperms and angiosperms) do not require external water for fertilization because they use pollen tubes to deliver sperm to the egg.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Select the correct statements from the following.
I. Endosperm is generally triploid in angiosperms.
II. All angiosperms have monosporic and endosporic embryo sac.
III. Angiosperms are characterised by double fertilization.
IV. All angiosperms show indirect pollination and siphonogamy.

  1. I, II and IV

  2. II, III and IV

  3. I, III and IV

  4. I, II, III and IV
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

I, III, and IV are correct. II is incorrect because not all angiosperms have monosporic embryo sacs; some are bisporic or tetrasporic.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Which of the following is false in angiosperms?

  1. Egg cell - haploid

  2. Megaspore - diploid

  3. Pollen grain - haploid

  4. Synergid - haploid

  5. Endosperm - triploid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Megaspores are haploid (n), produced by meiosis from the diploid megaspore mother cell. The option stating they are diploid is false.