Life History Pattern The life history pattern of an organism is “the pattern of its survival and reproduction events during its life”. The traits that are studied in life history pattern includes morphological features like biomass, growth rate, size, phonological events, age at maturity, and reproductive features like fecundity (ability to produce new offspring), schedule…
Origin of Cycadofilicales The Cycadofilicales or Pteridosperms are popularly known as ‘seed ferns.’ This group of Gymnosperms includes trees or small plants bearing fern-like foliage. They flourished greatly in the Carboniferous period, also known as the ‘Age of Ferns.’ The plants first appeared in the Devonian, became very prominent in the Carboniferous, but remained widespread…
Heterospory and seed habit Heterosporous plants produce two sets of specialized spores: megaspores (haploid female spores) and microspores (haploid male spores). Heterospory has evolved independently in several lineages. While, Homospory is the production of same type of spores. Scientists believe that heterospory is the precursor of seed reproduction. This is known as seed habit. The…
Density Dependent and Density Independent Factors Demography is the study of all the possible statistics that affect the size of a population. Some biotic and abiotic factors limit the size of a population. These factors are broadly categorized into density dependent and density independent factors. Density Dependent Factors A factor that affects the size of…
There are many factors affecting herbicide carryover or residues in soil and plants like residue itself, some biotic (microbes, plants), abiotic (soil, moisture, light), and chemical (degradation process, half-life) factors. Herbicides destroy plants (herbs) and more specifically off-type plants or weeds. After destroying weed plants or limiting their growth, herbicide residues may persist in the…
Forests are important as they are a vibrant part of the earth’s natural resources. They cover one-third of all land on earth, providing dynamic organic infrastructure for some of the planet’s densest, most diverse collections of life. The area underwood is the index of the development and prosperity of a country. Forests cover approximately 230.48…
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