Tag: biology

Questions Related to biology

In monocots

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Leaves have reticulate venation

  2. Stems have annual rings

  3. Seed have two storage organs

  4. Stems have scattered conducting strands

Show answer
Correct Option: D
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’.    

A monocot showing reticulate venation is

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Bombusa

  2. Smilax

  3. Callophyllum

  4. Ginkgo

Show answer
Correct Option: B
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'.

Tigellum is

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Embryonic axis

  2. Embryonic root

  3. Embryonic shoot

  4. Embryonic leaf

Show answer
Correct Option: A
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'.

Oil yielding plants are abundant in the family

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Solanaceae

  2. Ranunculaceae

  3. Cruciferae

  4. Curcurbitaceae

Show answer
Correct Option: C
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.

Embryo sac of angiosperms contains.

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  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

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Correct Option: A

Occurrence of triploid primary endosperm nucleus is characteristic of.

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Algae

  2. Bryophytes

  3. Gymnosperms

  4. Angiosperms

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Correct Option: D

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

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. $125$

  2. $100$

  3. $50$

  4. $25$

Show answer
Correct Option: B

External water is not required for fertilization of

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Pteriodophytes

  2. Bryophytes

  3. Thallophytes

  4. Spermatophytes

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Correct Option: D

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.

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. I, II and IV

  2. II, III and IV

  3. I, III and IV

  4. I, II, III and IV

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Correct Option: C

Which of the following is false in angiosperms?

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Egg cell - haploid

  2. Megaspore - diploid

  3. Pollen grain - haploid

  4. Synergid - haploid

  5. Endosperm - triploid

Show answer
Correct Option: B