Bachelor’s Degree Programme (BSCG) – Plant Anatomy and Embryology Assig. Answer | BBYCT – 135 (Q-10)
10. Write short notes on:
a) advantages of cross pollination
d) commercial cork
e) insectivorous plants
a) The advantages of cross-pollination are as follows:
i) Offsprings produced are healthier,
ii) New varieties can be produced through cross-pollination of two varieties of the same species or two species,
iii) Seeds that are produced are abundant and viable.
b) Parthenocarpy is the natural or artificially induced production of fruit without fertilization of ovules, which makes the fruit seedless. Stenospermocarpy may also produce apparently seedless fruit, but the seeds are actually aborted while they are still small.
c) Pneumatophores are a type of aerial root. Aerial roots are roots that grow from above the ground and absorb water directly from the air. Pneumatophores are formed by certain plant species submerged in water, in waterlogged soil, or in strongly compacted soil.
d) Commercial cork is derived from the periderm layers of a Quercus suber plant (cork oak tree). The plant typically exhibits extra Stelar secondary growth and shapes the cork layers. But when the plant is around 20 years old, these virgin cork layers are removed by stripping. Tissues that are exposed dry out.
e) Insectivorous means insect-eating, these plants derive most of their nutrition from the insects, that they trap and consume. These plants grow in humid areas, where plenty of sunlight and moisture is found. They are found in nitrogen-deficient soil. That is why they trap and digest insects to absorb nutrients. Venus flytrap, pitcher plant, and cobra lily are some of the insectivorous plants’ names. They are often called Carnivorous plants.