Tag: biology

The organisms which show differences in the two sexes of the same species are called as sexual dimorphic animals. The unisexual animals have either male or female reproductive organs. These organisms show differences in morphology, physiology and behaviour with respect to the sex of the organism. 

• Sexual dimorphism refers to the condition where the two sexes of the same species show different characteristics apart from the differences in their sex organs.
• In spiders, the drastic difference in size is seen where males are very small compared to females
• A common type of dimorphism is colouration which is commonly seen in many species of birds.
• Bees show difference of both size and pattern among Queen, Drone or worker bees.
• Among all the options, humans show least sexual dimorphism with nearly  same sizes and other similarities between both sexes.
• So, the correct option is 'Homo sapiens'.

Sexual dimorphism is the changes that are observed in two sexes of the same organism. In humans, the male and the female can be distinguished on the basis of many characters. The main property which is used for the distinction in the males and females is the presence of XX and XY set of chromosomes. The chromosomes contain the genes which are responsible for the expression of the characters. So, the sexual dimorphism is based on the genetic material. 

There is sexual dimorphism observed in the organisms which belong to the same species. There are differences in the characters of the female and male. In the birds, the males are more attractive than the females. The males have more colourful feathers in order to attract the female for sexual reproduction.

Cat-cry or cri-due chat syndrome is caused by the deletion of short arm of chromosome number 5 (5p). So, the genotype of affected individual in 46, XX, Sp- in female and 46, XX, 5p in males.

Sexual dimorphism is the changes that are observed in two sexes of the same organism. There are differences observed in the morphology. The females are smaller than the males. There are physiological changes due to the hormones which are produced in the males and females. The major hormone in the males is testosterone and in the females is oestrogen which is responsible for the difference in the sexual behaviour. There is also a difference in the behaviour. The males are defensive and protective due to the masculine nature. 

Parthenogenesis, a reproductive strategy that involves the development of a female (rarely a male) gamete (sex cell) without fertilization. Parthenogenetic species may be obligate (that is, incapable of sexual reproduction) or facultative (that is, capable of switching between parthenogenesis and sexual reproduction depending upon environmental conditions). An egg produced parthenogenetically may be either haploid (i.e., with one set of dissimilar chromosomes) or diploid (i.e., with a paired set of chromosomes). The production of female offspring by parthenogenesis is referred to as thelytoky 

• Sexual dimorphism refers to the condition where the two sexes of the same species show different characteristics apart from the differences in their sex organs.
• As both sexes consist of different chromosome pattern ( for e.g. XX AND XY in human beings), they differ genotypically.
• Those observable characters which are visible to us and helps us in knowing the sex of any animal/plant without knowing their chromosome pattern are essentially what phenotypic difference is about.
• So, the correct answer is 'Both A and B'.

Peat, also known as turf, is an accumulation of partially decayed vegetaation or organic matter.Sphagnum "moss", also called peat moss, is one of the most common components in peat, although many other plants can contribute.

Sphagnum is one of the most important plant genera in the world. Sphagnum is one of the few bryophyte genera able to dominate an ecosystem. A healing ointment prepared by Sphagnum leaves mixed with grease is used in the treatment of cuts and wounds. The decoction prepared by boiling dried Sphagnum in water, is used in the treatment of acute haemorrhage. This decoction is used to cure diseases of eyes. The lakes where sphagnum grows are called as Sphagnum bogs. These are well known to produce peat in acidic water. The bog water is antiseptic and has astringent properties. Sphagnum exhibit strong antibacterial properties against Gaffkeya tetragena and Staphylococcus aureus. Sphagnum peat is suitable for production of low and intermediate BTU gas as well as hydrogen , ethylene , natural gas , methanol and gasoline. Sphagnum is used as an effective filtering and absorption agent for the treatment of waste water and effluent of factories with acid and toxic discharge consisting of heavy metals particularly Ag, Pb, Cu , Hg, Fe , Sb and organic substances like detergents, dyes, microorganisms and soils.