Tag: growth and development in plants

Questions Related to growth and development in plants

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'

Perianth is bilabiate personate is

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

  1. Antirrhinum

  2. Salvia

  3. Peristrophe

  4. Ocimum

Show answer
Correct Option: A
Explanation:
Antirrhinum is a genus of plants commonly known as dragon flowers or snapdragons because of the group (Saerorhinum). The genus is characterized by personate flowers with an inferior gibbous corolla. Cultivars have showy white, crimson, or yellow bilabiate flowers Corolla is blipped. The two lips may be open (Bilabiate and Ringent, e.g., Salvia) or closed (Bilabiate and Personate, e.g., Antirrhinum). The mouth is closed by a projection of the lower lip called palate.
So the correct answer is 'Antirrhinum'.

Climber plant with zygomoprhic flower and diadelphous stemen is

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

  1. Tomato

  2. Soybean

  3. Dracaena

  4. Mustard

Show answer
Correct Option: B
Explanation:

Tomato belongs to Family Soianaceae. It is a climber. It has actinornorphic flower. 

Soybean belongs to Family Fabaceae. It s a climber. It has zygomorphic flower. It has Diadelphous stamen. 
Dracaena belongs to Family Liliaceae. It is a shrub. It has actinomorphic flower. 
Mustard belongs to Family Brassicaceae. It is a herb. It has actinornorphic flower. It has Tetradynamous stamen.
Thus, the correct answer is option B.

A flower with sepals, petals, stamens and carpels is said to be

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

  1. complete

  2. incomplete

  3. actinomorphic

  4. imperfect

Show answer
Correct Option: A
Explanation:

A flower having sepals, petals, stamens, and pistils are complete; lacking one or more of such structures, it is said to be incomplete. Stamens and pistils are not present together in all flowers. Rose, hibiscus, Oxalis, are a few examples

So, the correct option is, 'complete'.

Mature ovary forms the

biology reproduction in living organisms growth and development in plants sexual reproduction in plants post fertilization - plants

  1. Seed

  2. Stamen

  3. Pistil

  4. Fruit

Show answer
Correct Option: D
Explanation:

Fruits are formed by the maturation of one or more ovary. Fruits contain seeds resulting from the maturation of fertilized ovules. However, maturation of seed and fruit can occur in the absence of fertilization. In fleshy fruits, the outer covering is called as pericarp. Pericarp is again made of three layers, the epicarp, which is the outermost layer; the mesocarp, which is the middle layer; and the endocarp, which is the inner layer surrounding the ovary or the seeds. 

So, the correct answer is option D.

Which of the following is a post fertilisation event in flowering plants?

biology reproduction in higher plants growth and development in plants sexual reproduction in plants post fertilization - plants

  1. Transfer of pollen grains

  2. Embryo development

  3. Formation of flower

  4. Formation of pollen grains

Show answer
Correct Option: B
Explanation:
Events in sexual reproduction after the fertilisation are called post-fertilisation events. After fertilisation, a diploid zygote is formed in all sexually reproducing organisms. The process of development of embryo from the zygote is called embryogenesis.
So, the correct answer is 'Embryo development'.

In angiosperms, normally after fertilisation.

biology reproduction in higher plants growth and development in plants sexual reproduction in plants post fertilization - plants

  1. The zygote divides earlier than the primary endosperm nucleus

  2. The primary endosperm nucleus divides earlier than the zygote

  3. Both the zygote and primary endosperm nuclei divide simultaneously

  4. Both the zygote and primary endosperm nuclei undergo a resting period

Show answer
Correct Option: B
Explanation:

Endosperm is the nutritive tissue for the developing embryo and the seedlings. In angiosperm, the endosperm develops from triploid primary endosperm nucleus which is formed as a result of vegetative fertilization, triple fusion or fusion of male gamete with the secondary nucleus of the central cell. Generally, endosperm divides before zygote because it will provide nourishment to the developing zygote.

So, the correct option is 'The primary endosperm nucleus divides earlier than the zygote'