ANIMAL HORMONES
Animal hormones are chemical messengers produced by various glands and tissues in animals that regulate…
Animal hormones are chemical messengers produced by various glands and tissues in animals that regulate…
Mammals are biparental in reproduction that is sexual reproduction involves two distinct and separate individuals,…
1) Evidence from comparative anatomy Homologous structures can be used to explain the evidence of…
A) Mutation theory of organic evolution Mutation is a change in genetic material resulting in…
Charles Darwin, a British biologist, in 1859 propounded a theory of organic evolution by Natural…
Jean Baptiste Lamarck, a French biologist was one of the first biologists to put forward…
The world is occupied by millions of different kinds of plants and animals. These plants…
The lower plants All the plants from the single-celled Chlamydomonas, bacterium, Phacus to the simple…
The part of plasma which filters into the spaces among the tissues and flows in…
There are three plans or types of blood circulation in human beings, other mammals and…
The heart is an muscular organ that pumps blood to all human parts of the…
The transport system carries food and oxygen to all tissues and removes waste materials of…
The group – Pteridophyta consists of ferns and club-mosses. Dryopteris is a fern. It is…
Mosses are small, green and simple land plants belonging to phylum Bryophyta and class Musci….
Seeds A seed is a structure which develops from the ovule after fertilization. A seed…
After the maturation of fruits, an abscission layer is formed at the point of attachment…
Swimming movements Each side of the vertebral column (flexible backbone) of a fish is made…
The appendicular skeleton is made up of the limb girdles (pectoral and pelvic girdles) and…
There are over 2,000,000 known different organisms in the world today and probably over 1,000,000…
The animal kingdom is divided into invertebrates (animals without backbones) and vertebrates (animals with backbones)….
The modern classification system based on physiology, biochemistry and embryology have revealed distinct similarities between…
Cockroach is an omnivorous animal eating anything ranging from starchy and sweet things to papers,…
Movements in Hydra 1) Swaying Sometimes Hydra comes to rest on rock or other suitable…
Haemorrhage (bleeding) is the coming out of blood from the blood vessels which have been…
Pollination is defined as the transfer of mature pollen grains from the anthers of one…
Immediately after pollination, fertilization follows. Fertilization is the union of male and female gametes to…
This is the part of the plant which grows above the soil except the modified…
The root system is the part of the plant growing in the soil. This excludes…
The flowering plants form a group of plants known as Angiosperms. They are characterized by…
Primates are the most highly developed of all mammals with large brain, forward-facing eyes with…
The mammalian gametes are male gametes called sperm or spermatozoa (singular = spermato-zoon), while the…
Germination is a process by which the embryo of a seed grows out of its…