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Diatoms are [BHU 2000] (a) Fungi (b) Plantae (c) Protista (d) Protozoans Red oceanic tides can be due to [BHU 1986] (a) Diatoms (b) Dinophyceae (c) Red algae (d) Blue-green algae Some protists possess structures for regulation of …
Which group of organisms are devoid of cell wall in their vegetative stage but develop a wall in reproductive phase (a) Fungi (b) Blue–green algae (c) Slime mould (d) Archaebacteria Cell wall are well preserved as fossils in one of …
Characteristics of protista Protista (Protistos = Primary) includes unicellular eukaryotes and show the following characters : (1) Protists include solitary unicellular or colonial unicellular eukaryotic organisms which not form tissues. (2) The unicells may be naked or covered by …
Which of the following represents obligate anaerobes [CPMT 1991] (a) Spirogyra (b) Pisum sativum (c) Onion (d) Methane bacteria Which of the following is a photo–autotrophic bacterium (a) Rhodospirillum (b) Azospirillum (c) Nitrosomonas (d) Nitrobacter Rhizosphere bacteria are present around …
(a) Anaerobic breakdown of proteins is known as putrefaction. (a) The nuclear material of bacteria, consisting of naked DNA molecule, it is identified as nucleoid. (c) Glycocalyx is a loose gelatinous thin sheath called loose slime layer which is secreted …
In bacteria [AFMC 1982] (a) DNA is enclosed in nucleus (b) DNA is scattered (c) DNA is double stranded and ringed (d) None The chief component of bacterial cell wall is [MP PMT 1989] (a) Cellulose and chitin (b) Cellulose …
Characteristics of monera Monera (Monos – single) includes prokaryotes and shows the following characters : (1) They are typically unicellular organisms (but one group is mycelial). (2) The genetic material is naked circular DNA, not enclose by nuclear envelope. …
When generic name is repeated in specific name of a plant it is called (a) Synonyms (b) Antonyms (c) Tautonyms (d) None of the above About how many species, scientific names have been provided (a) 10 million (b) 5 million …
Systematics The science of naming the plant is known as [CPMT 1989] (a) Classification (b) Identification (c) Nomenclature (d) Taxonomy The branch of Botany concerned with the classification, nomenclature and identification of plants is [CPMT 1985] (a) Systematic Botany (b) …
Taxonomy Biology is an important branch of science dealing with the study of life. It is difficult to define life. But it is easy to discriminate living things from non-living things. On this basis life is defined as a …
Geologically one of the following eras is known as “Golden age of Reptiles” or “Golden age of Dinosaurs” [BHU 1988; CMC Vellore 1993; CPMT 1994, 2003; CBSE PMT 2002; Kerala CET 2003; Pb. PMT 2000] (a) Mesozoic (b) …
1.3 Origin and Evolution of Life Origin of Universe and Earth Philosophers and scientists have been busy to solve the riddle as to how the universe and our earth were formed and how and when ‘life’ originated …
Science : The term science is derived from Latin word scientia which means knowledge. So, the term ‘science’ is used for knowledge gained by actual observation, found correct on verification and put in a systematic manner or …
History of man is only about 50,000 years old. In the course of human history there have been three major explosions, each corresponding to a major changes in the environment. The first population explosion occurring about 20,000 years ago. It …
Molecular organisation of chromosome Broadly speaking there are two types of models stating the relative position of DNA and proteins in the chromosomes. (1) Multiple strand models : According to several workers (Steffensen 1952, Ris 1960) a chromosome is thought …
The term genetics (Gk. Genesis – descent) was coined by Bateson (1906). Genetics is the study of principles and mechanism of heredity and variations. The resemblance amongst offspring is never 100% (except in monozygotic twins) due to reshuffling …
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Cyclic And Non Cyclic Photophosphorylation We all are well aware of the complete process of photosynthesis. Yes, it is the biological process of converting light energy into chemical energy. In this process, light energy is captured and used for converting …
Photosynthesis is a process by which phototrophs convert light energy into chemical energy, which is later used to fuel cellular activities. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide. Photosynthesis …
“Transportation is the process that involves the movement of water and necessary nutrients to all parts of the plant for its survival. “ Transportation is a vital process in plants. Trees transport all the nutrients and water it needs for survival …
Plants are an essential part of the ecosystem. Every life on the earth is directly or indirectly dependent on plants. Among the different parts of a plant, the leaf is the most essential. Primarily, leaves have two functions: photosynthesis and …
What is a Stem? The stem is the ascending part of the axis bearing branches, leaves, flowers and fruits. It develops from the plumule of the embryo of a germinating seed. It bears nodes and internodes. What are nodes and internodes? The regions …
Modifications of Stem The stem helps in providing structure and support to the plant. It is modified into three important types: Underground Modifications Sub-aerial Modifications Aerial Modifications Underground Modifications of Stem Some underground stems are modified for food storage and …
The root is an underground part of the plant that absorbs water and minerals from the soil and anchors the plant firmly. In some plants, the roots change their shape and get modified to absorb and transport water and minerals …
Morphology is the name given to the science that deals with the study of the form and structure of things. No matter which plant you take, the morphology of a flowering plant includes the roots, stem, leaves, flowers, and fruits. …
Racemose is a type of an inflorescence where the main axis continues to grow indefinitely and does not terminate in flower. This is why it is also known as an indefinite or indeterminate inflorescence. The main characteristics are: Growth of the …
Inflorescence The pattern of flower arrangement on the floral axis is known as inflorescence. Inflorescence is divided into two main types: Racemose: In racemose types of inflorescence, the main axis grows continuously and flowers are present laterally on the floral axis. …
In this article we will discuss about:- 1. Definition of Botanical Garden 2. Functions of Botanical Gardens 3. History. Definition of Botanical Garden: The garden is generally defined as a place for growing flowers, fruits or vegetables. But botanic or botanical garden …
@ Natural selection @ can take many forms. To make talking about this easier, we will consider the distribution of traits across a population in graphical form. In we see the normal bell curve of trait distribution. For example, if …
# What do you understand by natural selection? Give examples. Natural selection is an important mechanism of evolution. It states that the organisms that are able to survive and reproduce with the changing environmental conditions are selected by nature while …
# Genetics and Evolution Notes # Genetics Genetics is the branch of science that deals with the study of genes, genetic variations and heredity in organisms. Genes are made up of DNA and are a type of genetic instruction. These …
The Modern Synthetic Theory of Evolution describes the evolution of life in terms of genetic changes occurring in the population that leads to the formation of new species. It also describes the genetic population or Mendelian population, gene pool and …
@# Charles Darwin, an English naturalist of the 19th century made an extensive study of nature for over 20 years. He collected the observations on animal distribution and the relationship between the living and extinct animals and finally found that …
## How Does Molecular Genetics Support Evolution? Genetics is one of the key aspects of evolution, and evolution is an ongoing process. The entire theory is supported with adequate genetic evidence to evolution. It is believed that we have descended …
## What is Evolution? Evolution mainly deals with the origin of life on earth. The conditions and the forms of life on earth were entirely different from what we see today. Everything evolved from one form to another for a …