Nature is a machine. The family is a machine. The life cycle is like a machine. Ray Dalio What is life cycle? The growth and development consists of a number of distinct morphological and cytological stages. The sequence of these orderly changes is called as LIFE CYCLE. It is the sequence of all different phases or events through which an […]
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Algae- General Characters (with PPT)
“The life of the planet began the long, slow process of modulating and regulating the physical conditions of the planet. The oxygen in today’s atmosphere is almost entirely the result of photosynthetic living, which had its start with the appearance of blue-green algae among the microorganisms” Lewis Thomas, 1984 What are algae? Algae is a group of chlorophyll containing thalloid […]
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Classification of Arthropoda with Identification Characters for Each Sub-Phylum and Class
Arthropods are classified into five sub-phylum and each then subdivide into classes (a total of 16 classes according to recent classification of animal taxa). Classification of Arthropods I. Sub-phylum: Trilobitomorpha (extinct arthropods) Class 1: Trilobita II. Sub-phylum: Chelicerata (spiders, horseshoe crabs) Class 1: Arachnida Class 2: Merostomata Class 3: Pycnogonida III. Sub-phylum: Myriapoda (centipedes, millipedes) Class 1: Chilopoda Class 2: […]
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Vascular Bundles: Structure, Composition and Classification
Vascular bundles (VB) are the components of vascular tissue system in plants. They are also called as ‘fascicle’. They are the part of TRANSPORT system in plants. It is one of the PRIMARY tissue systems in plants. More than that is a perfect example for a COMPLEX tissue system in plants. (Complex tissue = composed of more than one type […]
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GATE XL 2016 Life Sciences Model Question Paper Zoology Optional Paper With Answer Key and Explanations Set 1 (MCQ 018)
GATE XL 2016 Life Sciences ZOOLOGY Model Question Paper (MCQ 018) (1). Which of the following taxa of Arthropoda possess prehensors? a. Trilobits b. Arachnidas c. Chilopodas d. Diplopodas (2). In biological systematics the term ‘incertae sedis’ represents: a. An extinct taxa b. A fossil taxa c. A fossil specimen whose complete part is not yet characterized d. An enigmatic […]
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