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Functions of Synergids
Ultra structurally the structure and concentration of cell organelles reveals that synergids are metabolically active. The following Wee functions are attributed to synergids.
1. Directing of pollen tube growth by secreting some chemotropically active substances.
2. The degenerating synergids form the site for pollen tube discharge in the embryo sac.
3. The filiform apparatus may aid in the absorption and transportation of materials into the embryo sac from the nucellus.
Causes of Apomixis Apomictic species are generally hybrids or polyploids, as a consequence, there is irregular meiosis. Apomixis appears to be controlled by a set of genes. T
Multiplication Phas - Stages of spermatogenesis The initial cells in the germ line arc known as primordial germ cells (PCC). The PGC, which arise at some distance from the pro
What is reproductive isolation? The Living beings are considered under reproductive isolation when they cannot cross among themselves or if they can cross but cannot generate f
What is the external rigid carapace of arthropods called? Of which substance is it made? Which type of organic molecule is that substance? The external carapace of arthropods i
Define essentiality of Sulphur for growth of micro-organism? Sulphur is a part of some amino acids, some carbohydrates, biotin and thiamine. It is obtained either as elemental
Apomictic embryos in citrus arise from: 1. Synergids 2. Maternal sporophytic tissue in ovule 3. Antipodal cells 4. Diploid egg Maternal sporophytic tissue in ovule
What are the differences between genomes in simple eukaryotes vs complex eukaryotes?
What are the analyses provided by the study of human age pyramids? The study of human age pyramids can give the following analyses: proportion of individuals at an economically
what so special for phylum annelida
INSULIN Linear polymer of b-D-Glucose. Insulin is small-sized (25 - 35 residues) fructosan homopolysaccharide which is a reserve carbohydrate present in roots, tubers and
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