Tag: the flower

Questions Related to the flower

The perianth is the term used when

biology the flower structure of a bisexual flower growth and development in plants basics of leaf and flower

  1. Androecium and gynoecium are similar.

  2. Androecium and calyx are similar.

  3. Corolla and gynoecium are similar.

  4. Calyx and corolla are similar.

Show answer
Correct Option: D
Explanation:

Perianth is a collective term for outer parts of calyx and corolla enclosing androecium and gynoecium. This term is used to refer petalideous monocotyledons, in which the calyx and corolla are combined that they can be distinguished from each other.
Thus, the correct answer is option D.

Which of the following is regarded as equivalent to perianth?

biology the flower structure of a bisexual flower growth and development in plants basics of leaf and flower

  1. Glume

  2. Lodicule

  3. Superior palca

  4. Inferior palca

Show answer
Correct Option: B
Explanation:

A lodicule is one of two or three small scales at the base of the ovary in a grass flower that represent the corolla, believed to be a rudimentary perianth. For example, wheat (Triticum aestivum).

Thus, the correct answer is option B.

An inflorescence in which flowers arise from different points but reach the same level is called as

biology the flower structure of a bisexual flower growth and development in plants basics of leaf and flower

  1. Catkin

  2. Corymb

  3. Umbel

  4. Spadix

Show answer
Correct Option: B
Explanation:

Corymb : It is a slightly modified raceme in which the peduncle is relatively short while the pedicels of lower flowers are longer so that both young and old flowers are brought to more or less the same level, e.g., Cassz.a sophora.

Assertion : Gibberellins induce flowering in long day plants.

Reason : Genetically tall plant become dwarf by application of Gibberellin.

biology the flower structure of a bisexual flower growth and development in plants basics of leaf and flower

  1. If both the assertion and reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reaon is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true

Show answer
Correct Option: C
Explanation:

Application of GA can induce flowering in long day plants. It has no favourable effect on size of flower and fruit in certain plants. The genetically dwarf plants can be made tall by application of GA.

From among the situations given, choose the one that prevents both autogamy and geitonogamy.

biology the flower structure of a bisexual flower growth and development in plants basics of leaf and flower

  1. Monoecious plant bearing unisexual flowers

  2. Dioecious plant bearing only male or female flowers

  3. Monoecious plant with bisexual flowers

  4. Dioecious plant with bisexual flowers

Show answer
Correct Option: B
Explanation:

Monoecious(bisexual)plant bearing either bisexual or unisexual flowers can exhibit both autogamy as well as geitonogamy. Dioecious(unisexual) plants bearing only male or female flowers will not show autogamy or geitonogamy and only xenogamy is possible.

Read the following four statements (A-D).


(A) Flowers are the morphological and embryological marvel and the site of sexual reproduction.
(B) Anther are attached to the proximal end of the filament of stamen.
(C) Androecium and gynoecium represent the non-essential part of the flower.

(D) The number and length of stamens are variable in flower of different species. 

How many statements are correct? 

biology the flower structure of a bisexual flower growth and development in plants basics of leaf and flower

  1. One

  2. Two

  3. Three

  4. Four

Show answer
Correct Option: B
Explanation:

  • A flower is a reproductive structure of a flowering plant, which is a morphological and embryological marvel and the site of sexual reproduction.
  • Anther is attached to the distal end of the filament of the stamen.
  • Androecium (stamens) and gynoecium (pistils) represent essential parts of a flower.
  • The number and length of stamens are variable in flowers of different species.
So, the correct statements are 'Two'.

The perianth term is used when

biology the flower structure of a bisexual flower growth and development in plants basics of leaf and flower

  1. Calyx and gynoecium are similar.

  2. Calyx and corolla are similar.

  3. Androecium and calyx are similar.

  4. Corolla and gynoecium are similar.

Show answer
Correct Option: B
Explanation:

Calyx and corolla are called as accessory whorls. In some plants they are not differentiated from one another, in such case they are termed as perianth.

The fleshy edible part of jackfruit is derived from

biology the flower structure of a bisexual flower growth and development in plants basics of leaf and flower

  1. Bract

  2. Bracteole

  3. Perianth

  4. Floral axis

Show answer
Correct Option: A,C
Explanation:

The sheath or the perianth, of the inflorescense around the seed in the inflorescence is the edible part of the jackfruit. It is yellow shiny part. The perianth is the non-reproductive part of the flower and structure that forms an envelope surrounding the sexual organs, consisting of the calyx and the corolla.
Thus, the correct answer is option C.

Nectary of Euphorbia is an example of

biology the flower structure of a bisexual flower growth and development in plants basics of leaf and flower

  1. Complex tissue

  2. Secretory tissue

  3. Excretory tissue

  4. Simple tissue

Show answer
Correct Option: B
Explanation:

Nectary of Euphorbia is an example of secretory tissue. The tissues that are concerned with the secretion of gums, resins, volatile oils, nectar latex and other substances in plants are called as secretory tissues. These tissues are divided into two groups: laticiferous tissues and glandular tissues. 

Thus, the correct option is B.

Staminal tube is found in 

biology the flower structure of a bisexual flower growth and development in plants basics of leaf and flower

  1. Nicotiana

  2. Asparagus

  3. Hibiscus

  4. Pisum

Show answer
Correct Option: C
Explanation:

Stamens are numerous, epipetalous and monadephous. The filaments of all the stamens fuse to form staminal tube, round the style is a characteristic feature of family Malvaceae.