psychologicalblogspot

 Whittaker's Five Kingdom Classification: Whittaker proposed the Five Kingdom classification in 1969, which included Monera, Protista, Fungi, Animalia, and Plantae as the broad classifications of living organisms. Changes in Plant Kingdom Classification: Over time, our understanding of the plant kingdom has evolved. Fungi, members of Monera, and Protista with cell walls are now excluded from Plantae, even though they were previously classified under the same kingdom. Description of Plantae: This chapter focuses on the classification within Kingdom Plantae, also known as the plant kingdom. It discusses Algae, Bryophytes, Pteridophytes, Gymnosperms, and Angiosperms. Classification within Angiosperms: The chapter explores the classification within angiosperms to understand the concerns that influenced classification systems. Early systems relied on superficial morphological characters, while natural classification systems considered internal features like ultra-structure, anatomy, e...

Multiple Choice Questions 1. Which of the following can be made into crystal? (a) A Bacterium (b) An Amoeba (c) A Virus (d) A Sperm ANS: (c) A Virus can be made into a crystal. Viruses are microscopic infectious agents that consist of genetic material (DNA or RNA) enclosed in a protein coat called a capsid. Under certain conditions, viruses can be crystallized, which involves arranging the viral particles in an ordered, repeating pattern. 2. A cell will swell up if (a) The concentration of water molecules in the cell is higher than the the concentration of water molecules in the surrounding medium (b) The concentration of water molecules in the surrounding medium is higher than water molecules concentration in the cell (c) The concentration of water molecules is same in the cell and in the surrounding medium (d) Concentration of water molecules does not matter ANS:  (b) The concentration of water molecules in the surrounding medium is higher than the water molecule concentration in...

The sense of vision is one of the most important and complex functions of the human body. It is responsible for capturing light and transforming it into meaningful signals that our brain can interpret and make sense of. This process is made possible by specialized cells in the retina called rods and cones. In this blog, we'll focus on the signaling process of rod cells, the cells that play a crucial role in our ability to see in low light conditions. Rod cells are sensitive to light and are the first line of defense in low light conditions. They are densely packed in the retina and are sensitive to even the slightest change in light intensity. Rod cells are activated by a cascade of chemical reactions that start with the absorption of light by a pigment called rhodopsin. The absorption of light triggers a series of events that ultimately result in the release of a neurotransmitter called glutamate, which then signals the brain to detect light. The signaling process of rod cells i...

 the orderly sequence of events that coordinates and regulates the cell proliferation ( when it will divide and how and so will not become malignant). there are certain cells that have lost the capacity for division  RBC muscle cell  neurons certain cells that have the capacity of division but do not divide until getting stimulation: fibroblast cells lymphocytes hepatocytes POTENCY the body of a multicellular organism develops, cell specialise. this process of specialization is called DIFFERENTIATION. the specialised cells from tissue that have a specific function. these specialized cells lose the ability to divide. cells that retain the ability to divide by mitosis are potent. cell potency: the ability of cells to divide by mitosis giving rise to a further type of cells. TOTIPOTENT CELLS ability to make all cell types in the body and cell types that are important for the development of embryos for eg. zygotes in humans. PLURIPOTENT CELLS ability to make all cell types in...