Mrs Nubi

Theories of Evolution Organic Evolution Organic evolution is the sum total of adaptive changes from pre–existing or old forms that has taken place over a long time resulting in diversity of forms, structures and functions among organism. The basis of evolution is that all organisms have pre–existing ancestors. Evidences of Evolution Fossil record: A fossil …

Evolution: Theories of Evolution, Jean Lamarck’s theories & Charles Darwin’s theory  Read More »

Social animals are those in which individuals of the same species live together cooperatively in organized communities known as societies (colonies). Examples of social animals are: social insects (like termites, honey bees or wasps, ants etc), wolves, foxes, baboons etc. Characteristics of Social Insects They live together They display division of labour They show distinct …

Social Animals: Characteristics, Examples, Termites, Honey Bees, Read More »

VARIATION IN POPULATION A population represents a dynamic assembly of organisms belonging to the same species, coexisting within a defined geographical region over a specific duration. This collection of individuals, whether of plants, animals, or microorganisms, forms a vital ecological unit that undergoes continual changes and interactions. Variation, on the other hand, encompasses the array …

Variation, Competition & Succession of Organisms Read More »

GENETIC TERMINOLOGY Genetics, the scientific study of heredity and variation in all living organisms, was termed by Dilliam Bateson in 1906. Heredity/Inheritance pertains to the passage and manifestation of traits from parents to offspring, accounting for the common resemblances between them. Variation encompasses the dissimilarities existing among parents, offspring, and siblings. Genes are hereditary units …

GENETIC: HEREDITARY, TERMINOLOGY, MENDEL’S WORK, GENOTYPE & PRINCIPLES OF HEREDITARY Read More »

Courtship Behaviour in Animals and Territoriality: Courtship behaviour in animals refers to a set of behaviours and displays that individuals of a species engage in to attract potential mates and establish a reproductive partnership. This behaviour often involves various signals, sounds, postures, and movements that communicate the fitness and availability of an individual for mating. …

Reproductive Behaviours: Courtship Behaviour, Display of Colours & Seasonal Migration Read More »

STRUCTURE OF A FRUIT A fruit is a matured fertilized ovary of a flower containing one or more seeds. Contrary to this, some plants do not undergo fertilization for the formation of their fruit. Such fruits are called parthenocarpic fruits e.g. banana and pineapple. Such fruits are seedless. A typical fruit has the following parts …

Fruits : Types, Structure, Dispersal of Fruits, Agents of Dispersal of Fruits Read More »

Development of Zygotes in Plants In flowering plants, the process of pollination is followed by fertilization, leading to the development of the zygote. This development eventually transforms the flower into a fruit that encloses the seeds. The male and female sex cells responsible for zygote formation are the pollen grain and the ovule, respectively. The …

Seeds | Zygotes, Conditions for Seed Germination, Formation & Seeds Germination Read More »

The reproductive system in humans is a complex and vital system responsible for the creation of new life. It plays a fundamental role in the perpetuation of the human species and involves a series of intricate processes that culminate in reproduction. Let’s delve into the various aspects of the reproductive system and the process of …

Reproductive System and Reproduction in Humans Read More »

NATURAL DYNAMIC BALANCE: In the realm of nature, a state of dynamic equilibrium prevails. When environmental conditions influenced by population dynamics, encompassing both abiotic and biotic elements, are propitious, growth is encouraged. Conversely, when these conditions turn unfavourable, growth is hindered. A constraining element that curbs population expansion is termed a “limiting factor.” The amalgamation …

Balance in Nature | Biotic Factors, Abiotic Factors, Family Planning & Birth Control Read More »

SENSORY RECEPTORS Living organisms have the ability to respond to changes in their environment, known as stimuli. These stimuli can be of various types, including mechanical, electromagnetic, chemical, or thermal. While most cells in an organism’s body are capable of sensing stimuli, certain cells specialize in detecting specific types of stimuli. These specialized cells are …

Sense Organs | Skin, Eyes, Ears, Nose & Tongue Read More »

Structure of The Kidney The mammalian kidney is a reddish-brown, bean-shaped organ located at the posterior end of the abdomen. The right kidney is slightly lower than the left. On cutting a kidney longitudinally, two distinct regions are observed: an outer cortex and an inner medulla. Narrow tubules called urinary tubules (nephrons) pass through these …

Kidney | Structure, Functions, Diseases, Effects, Remedies & Osmoregulator Read More »

What are Hormones? Hormones are chemical substances produced or secreted by endocrine glands, which are ductless glands in the body. They are released into the bloodstream and travel to target organs to exert their effects. Hormones can speed up or slow down biological reactions in the body. They act as chemical messengers, produced in one …

Hormones | Animal Hormones & Plant Hormones Read More »