Birthmarks are coloured marks on the skin that are noticeable at birth, or shortly afterwards. There are two types of birthmarks: pigmented and vascular. Pigmented birthmarks are caused by clusters of pigment cells; they are usually tan or brown-coloured. Vascular birthmarks are caused by abnormal blood vessels in or under the skin; they are often […]
• Common name : Western Ragweed • Scientific name : Ambrosia psilostachya • Family : Asteraceae • Native land : North America, nearly all of the continental United States, and the Northern half of Mexico It is a perennial herb. It grows like a slender, branching, straw-coloured stem to a maximum height near two metres,
• Common name : Tampala • Scientific name : Amaranthustricolor • Family : Amaranthaceae • Native land : South Central Mexico It is an annual or short-lived perennial plant. Amaranth now has worldwide distribution. The amaranth plant is a grain and greens crop plant. The plant develops long flowers, which can be upright or trailing
A person goes through various stages of physical and mental growth. All children have different physical stature and strength. They also have different levels of mental development. To measure an individual’s mental level of development, a series of tests have been made. These tests are called IQ (relative intelligence of a person) tests. ‘IQ’ is
• Common name : Garlic Mustard • Scientific name : Alliariapetiolata • Family : Brassicaceae • Native land : Europe, including Britain, South to North Africa and East to West Asia and the Himalayas It is a biennial flowering plant in the mustard family. The plant has delicate green leaves and snow-white flowers. The leaves
• Common name : Alfalfa • Scientific name : Medicagosativa • Family : Papilionaceae • Native land : Asia Minor and the Caucasus Mountains (warmer temperate climates) It is a perennial flowering plant. The plant shows numerous small clover-like spikes of blue or violet flowers of upright growth. The plant grows to a height of
The coloured part of our eyes is called the iris. A pigment called melanin is present in the iris. The level of melanin determines the colour of the eye; the more the percentage of melanin, the darker the eyes. Blue, green and grey eyes have less melanin in the iris and so are lighter in
• Common name : Seaside Alder • Scientific name : Alnusmaritima • Family : Betulaceae • Native land : The United States The name ‘Maritima’ comes from Latin, meaning growing by the sea. It is a deciduous, multi-trunked, upright-rounded, fall-blooming perennial large shrub or small tree that typically grows to 20-30 feet tall. The greatest
• Common name : Hollyhock • Scientific name : Alcearosea • Family : Malvaceae • Native land : Asia and Europe The plant is variously described as a biennial (having a two-year life cycle), as an annual, or as a short-lived perennial. There are about 60 species of this flowering plant. They can grow up
• Common name : Century Plant • Scientific name : Agave attenuata • Family : Asparagaceae • Native land : The plateaus/mountains of Central Mexico Century plant is a rosette forming evergreen herbaceous perennial succulent. It is popular for its attractive leaves and its huge drooping flower stems. Spineless, fleshy, ovate, light grey to pale
• Common name : Mexican Hyssop • Scientific name : Agastachemexicana • Family : Labiatae • Native land : Southern North America It belongs to the family of mint and is a perennial and self-fertile plant. Typical of the mint family, the stems are square and they can grow up to 4 inches tall. There
• Common name : Himalayan Lantern • Scientific name : Agapetesserpens • Family : Ericaceae • Native land : The Himalayas The plant is an evergreen perennial. It is an odd member of the blueberry family. The plant has long, arching stems adorned with scarlet, jewel-like blooms. The fascinating patterns of this plant make it
Every organism whether an animal, human, plant or fish resembles its parents. This phenomenon of resemblance is called heredity. It is the passing down of certain characteristics or traits from a parent to its offspring through the genes. For example, your eyes may look like your mother’s eyes or your nose may look like your
• Common name : African Violet • Scientific name : Saintpaulia • Family : Violaceae • Native land : East central Africa It was first discovered in 1892 in East Central Africa by Baron Walter von Saint Paul-Illaire. It is a herbaceous perennial flowering plant, usually grown indoors. It is popular due to its ability
Smell is a type of sense. The nose has the sense of smell. We can smell due to airborne chemicals present in objects. For example, a rose gives out certain chemicals in the air which are perceived by the human nose and in turn the smell of rose is detected. Smell can be pleasant or