Tag: biology

The primary role of a flower is reproduction. They are the reproductive organs of a plant and they help in the joining of the pollen and the ovules to produce an offspring.

• Zygomorphic symmetry, also known as bilateral symmetry occurs in a flower through which it can pass only one plane of symmetry that will divide it into two parts.
• The Fabaceae or Leguminosae, commonly known as the legume, pea, or bean family are a large and economically important family of flowering plants which has a zygomorphic flower.
  
• Pea, bean, Cassia and Gulmohar belong to Fabaceae.

The bulb is the modified underground stem surrounded by the fleshy leaves. It usually contains stored food like the tulip bulb. Also, a capsule is a type of simple but mostly dry and dehiscent fruit. Some examples are Cotton, Eucalyptus, Datura, Witch Hazel. Orchid seeds don’t have endosperm. Primrose is having free central placentation.

Thus, the correct answer is option D.

The wrong statement is " the side of the flower towards the bract is called posterior side"

Both hardy and tropical hibiscus are propagated from cuttings. Hibiscus cuttings are normally the preferred way of propagating hibiscus because a cutting will grow to be an exact copy of the parent plant. When using hibiscus cuttings to propagate hibiscus, start by taking the cutting. The cutting should be taken from new growth or softwood. Softwood is branches on the hibiscus that have not yet matured. Softwood will be pliable and often has a greenish cast. You will mostly find softwood on a hibiscus in spring or early summer. 

Tradescantia spathacea is boat lily. Calotropis is milkweed. Homo sapien is human. Syzygium aromaticum is cloves. 

A small part of a plant which is removed by making a cut with a sharp knife is called a 'cutting'. A cutting may be a piece of stem, root or even a leaf. While making a cut, care should be taken to see that there are some buds on it. Cutting is a part of artificial reproduction. In this method, a cutting of the parent plant (say, of stem or shoot) having some buds on it is taken and its lower part is buried in the moist soil. After a few days, the cutting develops roots, shoot and grows into a new plant. Cuttings are a means of asexual reproduction in plants. The new plant formed from a cutting is exactly similar to the parent plant. The plants like rose, Bougainvillea, Chrysanthemum, grapes, sugarcane, bananas, and cactus, etc., can be grown by means of cuttings. For example, rose plant and Chrysanthemum are propagated (or reproduced) by means cuttings from stems (or shoots) as follows. A piece of stem (or side shoot) having bud is cut from an existing rose plant with the help of a knife. The lower part of this gutting is buried in moist soil. After a few days, the end of cutting buried in soil develops roots and later on grows to become a new rose plant. An advantage of cuttings method is that by using this method we can produce many new plants from just one plant quickly, without waiting for flowers and sexual reproduction. 

Conifers belong to gymnosperm. These have seeds in the cones. These are non-flowering plants. Cones are the reproductive organs. These are characterized by needle-shaped leaf.

Calotropis is a genus of flowering plants in the dogbane family, Apocynaceae, first described as a genus in 1810. It is native to southern Asia and North Africa. They are commonly known as milkweeds because of the latex they produce. Calotropis species are considered common weeds in some parts of the world. The flowers are fragrant and are often used in making floral tassels in some mainland Southeast Asian cultures. Fibers of these plants are called as madar or mader. Calotropis species are usually found in abandoned farmland. Lotus is Nelumbo nucifera. Jasmine is Jasminum sp. Oleander is Nerium sp. 

The plant which opens during nights and closes in daytime is night queen. It is called as raat ki rani in India. It is an evergreen woody shrub growing to 4 metres (13 ft) tall. The leaves are simple, narrow lanceolate, 6–20 centimetres (2.4–7.9 in) long and 2–4.5 centimetres (0.79–1.77 in) broad, smooth and glossy, with an entire margin.