Tag: the flower

Questions Related to the flower

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

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

  1. Corolla

  2. Bracts

  3. Calyx

  4. Androecium

Show answer
Correct Option: B
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'

Identify the wrong statement.

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

  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

Show answer
Correct Option: D
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'

Individual members of perianth are called ________.

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

  1. Bracteoles

  2. Bracts

  3. Spathes

  4. Tepals

Show answer
Correct Option: D
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'

Perianth refers to

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

  1. Nonessential floral organs

  2. Essential floral organs

  3. Fused stamens and carpels

  4. Undifferentiated calyx and corolla

Show answer
Correct Option: D
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'.

Structure equivalent to perianth is

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

  1. Superior palea

  2. Inferior palea

  3. Glumes

  4. Lodicules

Show answer
Correct Option: D
Explanation:

The term perianth is used to refer to the condition when the calyx and corolla are not differentiated. In grasses, the similar condition is seen by the presence of lodicules, that are situated below the ovary. 

A. & B. Palea are bracts present in spikelets of the grasses.
C. Glumes are the involucre in the inflorescence of a spike.
D. Lodicules are the covering present below the ovary, similar to the perianth.
Hence, the correct answer is 'Lodicules'

Individual components of perianth are called ______.

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

  1. Sepals

  2. Petals

  3. Tepals

  4. Bracts

Show answer
Correct Option: C
Explanation:

The whorl perianth represents undifferentiated calyx and corolla. Its individual units are called tepals. Tepals can be petaloid if coloured bright or sepaloid if green.

A. Sepals are the units of the calyx.
B. Petals are the units of the corolla.
C. Tepals are the units of perianth.
D. Bracts form a cover exterior to the calyx.
Hence, the correct answer is 'Tepals'.

Achalmydeous flower occurs in

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

  1. Sunflower

  2. Betel

  3. Onion

  4. Avena

Show answer
Correct Option: B
Explanation:

Achlamydeous condition refers to the absence of both the calyx and the corolla. Instead, there is a presence of the whorl called perianth. This type of condition is seen in betel, belonging to the family Piperaceae.

A. Sunflower shows calyx as pappus and corolla.
B. Betel is achlamydeous.
C. Onion has perianth arranged in two whorls.
D. Avena has the lemma and palea.
Hence, the correct answer is 'Betel'.

Involucre is composed of

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

  1. Bracts

  2. Extra calyx

  3. Bracteoles

  4. Scale leaves

Show answer
Correct Option: A
Explanation:

Involucre refers to the group of bracts that are arranged in one or more whorls around the flowers. Example, sunflower.

A. Bracts make up the involucre.
B. Epicalyx makes up the extra calyx, present exterior to the calyx, example, Cotton.
C. Bracteoles make up the epicalyx.
D. Scale leaves make up the scaly bracts at the base of each floret in family Asteraceae.
Hence, the correct answer is 'Bracts'

Read the statements carefully :
a) Flowers are morphological and embryological marvel and the site of sexual reproduction
b) The proximal end of the filament is attached to the thalamus or the petal of the flower
c) The number and length of stamens are variable in flowers of different species
d) stamen attached to the petal is epipetalous
How many above 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: D
Explanation:

Flowers are the site of sexual reproduction in a flowering plant. They are a morphological and embryological marvel. The proximal end of the filament of the stamen is attached to the thalamus or the petal of the flower. The number and length of stamens are variable in flowers of different species. The number varies from 3 to 10 in different species. Also, the size of stamens varies largely in different species. Stamen attached to the petal is called as epipetalous. For example, Brinjal.

Thus, the correct answer is option D.

Bougainvillea flower is an example of

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

  1. incomplete flower

  2. having a large nectary

  3. water pollination

  4. large colorful bracts

Show answer
Correct Option: D
Explanation:

Bougainvillea flower of the plant is generally white and in which each cluster of 3 flowers is surrounded by 3 or 6 bracts with the bright colors associated with the plant, including purple, magenta, red, pink, white, or yellow, orange,

So, the correct answer is 'large colorful bracts'