Morphology of Flowering Plants Test -10

The smallest angiopsermic plant is Wolffia. It is a aquatic plant, free floating , green or yellow green and without roots.

Stipules are the small lateral outgrowth of the leaf base which protect the young leaf and its axillary buds in young stage. It is a green leafy structure.

Zostera is a marine angiospermic plant. The plants have broad leaves that help them in floating on water surface, the root is poorly developed.

Homologous structures are those structures in which they havecommon origin and structure but perform different functions. Pea tendrils and Opuntia spines are homologous structures.

The main plant body of banana is aggregation of leaf base. Stem is highly reduced and rudimentary present at the base of plant body.

Phylloclade are green succulent stems of indefinite growth that perform thefunction of photosynthesis duet to presence of chlorophyll.

Leaves perform the function of photosynthesis, exchange of gases and transpiration to loose excess of water. Formation of new buds is not a function of leaves.

The silk produced by Antheraeamylitta is called Tasar silk. This silk is considered as most durable and best quality silk.

When sepals or petals in a whorl just touch one another at the margin, without overlapping, as in Calotropis, it is said to be valvate.

A plant having male, female and inter-sexual flowers is called polygamous flower. Same plant bears all three kinds of flowers.

Tulipa, commonly known as the tulip is a genus of spring blooming, perennial herbaceous, bulbiform geophytes  (having bulbs as storage organs). The flowers are usually large, showy and brightly coloured, generally red, pink, yellow, or white. It belongs to the family Liliaceae. Tulip was cultivated in Asia. Cultivation of tulip began in Persia. Tulip is mainly used as an ornamental plant in domestic gardens.

Aschynomene is a genus belonging to the family Fabaceae. The used part of Aschynomene is the wood of the stem (often mistaken as pith). The woods of Aschynomene species is one of the lightest woods in the world. The wood feels like a piece of thermacol or even lighter than the cork. The wood is bright-white to off-white in colour.

• Avicennia is a mangrove flowering tree that suffers from a lack of oxygen because it commonly grows in saline marshes and water is logged here. 
• Roots of such plants become negatively geotropic with minute pores called pneumathodes towards the upper end and are called breathing roots or pneumatophores that help the adequate supply of oxygen to the plant. 

So, the correct option is 'C.

Catkin is a slim, cylindrical flower cluster with the inconspicuous or no petals. They are generally wind pollinated but some of them are insect pollinated. They contain many, usually unisexual flowers, arranged closely along a central stem which is often drooping.

In cymose inflorescence, the growing point always forms a flower i.e., the main axis is terminated. The arrangement of flowers is basipetal which is having the oldest one at the tip and the younger one away from it. 

Plants that are in a symbiotic relationship with certain bacteria present in roots to carry out nitrogen fixation have nodules in their roots where bacteria are localized. This is the special adaptation found in pulses which belongs to the family Fabaceae to fulfill their nitrogen requirements.

Cuscuta is the parasitic plant that lives into the stem of the host of the different variety of plants. They penetrate the hosts root by folding around themselves and produce haustoria that move inside the plant makes contact with vascular bundles and steal all the food made by it.

The Microspores divides to form a 13 celled non-green, male gametophyte Cone vegetative/prothallial cell + 8 jacket cell + 4 Primary androgenic cells).

• The gynoecium is the female reproductive organ present in a flower.
• The unit of gynoecium is pistil or carpel. 
• The carpel is differentiated into three distinct regions -  (1) stigma (2)style (3) ovary.
• In some species, stigma is feathery, which is known as plumose stigma, e.g., in grasses.