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Q. What is embryonic sac? Which are the cells that form the embryonic sac? What are their ploidies?
The embryonic sac is female gametophyte of angiosperms.
The embryonic sac is collected of three cells that remain next to the micropyle, two lateral synergids and the central oosphere (egg); one binucleated cell, the polar nuclei, is placed in the central region; three antipodal cells stay in the opposite side to the micropyle. Ever since all these cells come by mitosis from the functional megaspore they are haploid (n).
Define Determinants of Food Security - Food Availability? It depends on the quantum and quality of crops, livestock, fishery and other food sources, as well as commercial impor
What is Class Reptilia ? Class Reptilia include the vertebrates that have successfully transitioned to a terrestrial lifestyle by evolving protective scales and a "land egg."
Q What are the retroviruses? How do they reproduce and what is the role of the enzyme reverse transcriptase? Retroviruses are viruses whose genetic material is RNA, HIV and the
Maintenance of Gut Lining After studying the digestive enzymes you would wonder why the gut linings are not digested themselves. This is because animals have several mechanism
Define Corneal Ulcer - Micronutrient Deficiencies? Corneal xerosis, if not treated promptly, leads to ulceration of the cornea. Initially, the ulcer may be shallow, and if it b
Define Mechanisms for Provide protection against colon cancer? Several plausable mechanisms have been formulated by which fibre may provide protection against colon cancer. The
Manx cats are heterozygous for a dominant mutation that results in no tails or very short tails, large hind legs and a distinctive gait. The mating of two Manx cats yields two Manx
B l oo d Protozoan and Ricketsial Diseases T r y p a n o s o m i a si s It is also known as surra in equines and tibarsa in camel and results in intermitte
Q. What are the main respective constituents of cell walls in bacteria, protists, fungi and plants? In bacteria the cell wall is made of peptidoglycans, amongst protists algae
Q. How is arthropod reproduction characterized? Reproduction in beings of the phylum Arthropoda is sexual with larval stage in some insects and crustaceans (arachnids) present
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