Tag: structure of a bisexual flower

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Questions Related to structure of a bisexual flower

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

Stamens represents the male flowers and pistil represents a female flowers in 

  1. Cyathium

  2. Spadix

  3. Verticillaster

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

In Cyathium inflorescence, stamen represents the male flowers and pistil represents a female flower. This type of inflorescence is characterized by the presence of several male flowers (stamen) around a pistillate flower. Cyathium inflorescence is the characteristic feature of Euphorbia genus.

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

Colour of Bougainvillea is due to 

  1. Coloured sepals

  2. Coloured bracts

  3. Coloured petals

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Bougainvillea plant is so colourful due to the magenta bracts. Three flowers are borne at each stem node, with flowers surrounded by three bracts, resulting in thick plant coverage with masses of color. Color is due to papery bracts, that enclose the true slender tubular white flowers. Bract colors can be white, pale to deep pink, magenta, various shades of red, purple, mauve, lavender, gold, peach, orange, salmon and some color combinations. Colors can change as bracts age and can be deeper or paler depending on where the plant is grown
So, the correct answer is 'Coloured bracts'
Multiple choice biology the flower structure of a bisexual flower growth and development in plants basics of leaf and flower

Glumes represent

  1. Bracts

  2. Sepals

  3. Petals

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

Glumes represent bracts. Glumes are a basal, membranous, outer sterile husk or bract in the flowers of grasses (Poaceae) and sedges (Cyperaceae). A bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis or cone scale. Bracts are often different from foliage leaves. They may be smaller, larger or of a different colour, shape or texture. Typically, they also look different from the parts of the flower, such as the petals or sepals. 
Thus, the correct answer is option A.

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

Autogamy can occur in a chasmogamous flower if.

  1. Pollen matures before maturity of ovule

  2. Ovules mature before maturity of pollen

  3. Both pollen and ovules mature simultaneously

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Autogamy is pollination within a flower. Chasmogamous flowers are those in which anthers and stigma are exposed. For autogamy, in such a flower to take place, pollen and ovule should mature simultaneously and anther and stigma should lie close to each other.

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

Non-essential floral organs without differentiation of calyx and corolla are called ________.

  1. Thalamus

  2. Pedicel

  3. Perianth

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

The non-essential parts of the flower are those that are not involved in the process of fertilization directly. These are called the accessory whorls. The calyx (made up of sepals) and corolla (made up of petals) represent the accessory whorls. In some flowers, the calyx and corolla are not differentiated or distinct. Then the resultant structure is called perianth whose individual units are called tepals.

A. Thalamus is the swollen end of the peduncle that bears flowers.
B. Pedicel connects individual flower to the inflorescence.
C. The perianth is the non-essential floral whorl without differentiation of calyx and corolla.
D. Lodicules are the scaly structure below ovary in grasses.
Hence, the correct answer is 'Perianth' 

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

Colour of Bougainvillea flower is due to colour of its ________.

  1. Corolla

  2. Bracts

  3. Calyx

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

The flowers of Bougainvillea are bright pink in colour because of the colour of the bracts. These flowers do not have a distinct and differentiated corolla as well as calyx. Three tiny flowers are surrounded by the bracts. These bracts are modified leaves. They protect the flower and attract the pollinators.

Hence, the correct answer is 'Bracts'

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

Identify the wrong statement.

  1. A plant that bears male, female and bisexual flowers is polygamous

  2. Actinomorphic flower can be dissected into two equal halves from any place

  3. Superior ovary is found in hypogynous flowers

  4. Side of the flower towards the bract is called posterior side
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When the flowers are laterally borne, then the side of the flower towards the apex of central axis or mother axis is considered to be the posterior side in a floral diagram while the side opposite to the posterior side is towards bracts and is called the anterior side. So, side of the flower towards the bract is called the anterior side.

Hence, the correct answer is 'Side of the flower towards the bract is called posterior side'

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

Individual members of perianth are called ________.

  1. Bracteoles

  2. Bracts

  3. Spathes

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

In some flowers like onion and Asphodelus, the calyx and corolla are not distinct. They are collectively called the perianth. The perianth is an accessory whorl whose individual member is called tepal. Based on the appearance, the tepals can be petaloid (coloured) or sepaloid (green).

Hence, the correct answer is 'Tepals'

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

Perianth refers to

  1. Nonessential floral organs

  2. Essential floral organs

  3. Fused stamens and carpels

  4. Undifferentiated calyx and corolla
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When the calyx and corolla are indistinct and undifferentiated, the resultant whorl is called the perianth. 

A. Accessory whorls of calyx, corolla and perianth are non-essential floral organs as they are not directly involved in the process of fertilization.
B. Androecium and gynoecium are considered to be essential floral organs because they form the male and female gametes respectively.
C. Fused stamens with style and stigma of carpel form gynostegium.
D. Undifferentiated calyx and corolla are called perianth.
Hence, the correct answer is 'Perianth'.