Tag: basics of leaf and flower

A cyclic flower which can be divided into two equal vertical halves by any vertical plane is said to be actinomorphic. Here, petals are in radial symmetry i.e. all the petals are identical in size and shape. The bilaterally symmetrical flowers which are symmetrical in only one plane and can be cut into two equal halves through single vertical pane only are said to be irregular or zygomorphic. Zygomorphic flowers have bilateral symmetry. A flower that can be cut into two equal halves by at least one plane is symmetric flower; it may be bilaterally or radially symmetrical.
Therefore, the correct answer is option B.

A dioecious or unisexual flower bears either male or female sex organs. The plant could be either male or female. When only stamens are present, it is called as staminate flower. When only carpels are present, it is called as pistillate flower. e.g., Papaya and Mulberry.
So, the correct answer is 'Both (C) and (E)

In unisexual flower, androecium (staminate flower) or gynoecium (pistillate flower) any one of them are present in the flower. Cocus nucifera (coconut) flower has either stamens or pistils. 

 Zea mays has diclinous flowers on the same plant. Diclinous flowers are flowers which have stamens and pistils on seperate flowers, it could be on the same plant or different. The plant could be monoecious or dioecious but the male and female reproductive parts are not present on the same flower. Female inflorescences in Zea mays, are tightly enveloped by several layers of ear leaves commonly called husks. Certain varieties of maize have been bred to produce many additional developed ears. The apex of the stem ends in the tassel, an inflorescence of male flowers. When the tassel is mature and conditions are suitably warm and dry, anthers on the tassel dehisce and release pollen. Maize pollen is anemophilous (dispersed by wind) and because of its large settling velocity, most pollen falls within a few meters of the tassel.

Commelina benghalensis, commonly known as the Benghal dayfloweris a perennial herb native to tropical Asia and Africa. These show cleistogamy. Cleistogamy or automatic self-pollination describes the trait of certain plants to propagate by using non-opening, self-pollinating flowers. Virtually all plants that produce cleistogamous flowers also produce hasmogamous ones. The principal advantage of cleistogamy is that it requires less plant resources to produce seeds because development of petals, nectar and large amounts of pollen are not required. This efficiency makes cleistogamy particularly useful for seed production on unfavorable sites or adverse conditions. The obvious disadvantage of cleistogamy is that self-fertilization occurs, which may suppress the creation of genetically superior plants.Therefore, the correct answer is option A.

In Tagetes the flowers are centripetally arranged. Tagetes species vary in size. Most species have pinnate  green leaves. Blooms naturally occur in
golden, orange, yellow, and white colors, often with maroon highlights. Floral heads are typically with both ray florets and disc florets.

A bisexual flower is a flower that contains all the four whorls such as petals, sepals, the male reproductive structure (stamen) and female reproductive structure (pistil). Hence it is also called as a complete or perfect flower.

• The zygomorphic flower is those which are only divided into two half from one plane. It includes pea, Gulmohar, cassia, and beans.
• Mustard, datura, and chili are the actinomorphic flowers as they are divided into two half from any plane.

• The flower which has both stamens and carpels are known to be perfect flowers. Almost all angiosperms. Ex- Lily, rose, Orchids etc
• Flower in which one of the reproductive parts is absent is known as a perfect flower.Ex-cucumber,corn,willow etc.
• A flower made of multiple flower or inflorescence is a composite flower. Ex-Sunflower.

Flowers in which both male and female parts are present are called as bisexual flower. Hibiscus and mustard are examples of bisexual flowers.