Question

In some member of Rosaceae, Leguminosae and Solanaceae, pollen grains maintain viability for month due to
a. Sporopollenin
b. Tectum
c. Specific proteins
d. Pecto Cellulosic initine

Answer 1

Hint: Viability refers back to the capacity to germinate while environmental conditions are beneficial to the plant. Thus, pollen viability refers to the proportion of pollens produced which are different in the rate of production as compared to other different species of plant. Viability can be seen as a dormancy stage of the pollen.

Complete answer:
- Pollen viability refers to the capability of the pollen to carry out its characteristic of turning in male gametes to the embryo sac.
- These practical assets of the pollen after their launch from the anther vary significantly from species to species and its exceptional is assessed on the idea of its viability.
- Pollen viability is an index of its fine duration period and vigour
- The length for which pollen grains remain feasible is particularly variable and to a point depends on the triumphing temperature and humidity.
- Sporopollenin is one of the maximum chemically inert organic polymers. It is a chief element of the tough outer (exine) walls of plant spores and pollen grains. It is chemically very strong and is commonly properly present.
- Sporopollenin is likewise discovered in the cellular partitions of numerous taxa of inexperienced algae, which include Phycopeltis (an ulvophyceae) and Chlorella.
- The most important biochemical motive for the loss of viability all through the garage is basically due to the deficiency of breathing metabolites, which is the end result of continuous metabolic pastime through the pollen.
- As a result of long time storage, there are reports of large modifications in the quantity of carbohydrate, amino acids, and natural acid levels inside the pollen of various species.

Hence, the correct answer is option (A).

Note: Spores are dispersed with the aid of many exclusive environmental factors, including wind, water or animals. If the situations are appropriate the sporopollenin-impregnated partitions of pollen grains and spores can persist in the fossil file for hundreds of millions of years, seeing that sporopollenin is immune to chemical degradation by means of organic and inorganic chemical compounds.