CLONE :- Offspring from single parent, Morphology and genetically similar individuals. CYST :- Hard covering around the organism protecting from anti environment. DIOECIOUS :- It is the condition in which either male or female reproductive organs are found in the same body of an organism. EMBRYOGENESIS :- It is the process of development of embryo from the zygote.. FERTILIZATION :- The union of two opposite types of gametes, spermatozoa and ova to produce single diploid zygote. FISSION :- Division of nucleus with cytoplasm. FRAGMENTATION :- Division of breaking into distinct pieces each of which can produce an offspring. GEMMULE :- The parent individual releases a specialized mass of cells enclosed in a common opaque envelope called the gemmule. HERMAPHRODITE :- Organisms which have both male and female reproductive organs in the same individual. HOMOGAMETES :- When the two gametes of male and female are so similar in appearance that it is not possible to c
Endocrine glands lack ducts and are hence, called ductless glands. Their secretions are called hormones. The classical definition of hormone as a chemical produced by endocrine glands and released into the blood and transported to a distantly located target organ has current scientific definition as follows: Hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amounts. The new definition covers a number of new molecules in addition to the hormones secreted by the organised endocrine glands. Invertebrates possess very simple endocrine systems with few hormones whereas a large number of chemicals act as hormones and provide coordination in the vertebrates.