Biology Concepts and Articles
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Occurrence It is common in soil water. Its various species live as saprophyte. Some of them live on decaying plant as parasites. The parasitic stage attacks the roots and the seedlings. It causes disease Damping-off. Pyd him debaryanum causes this disease. Some species are
EVOLUTIONARY PRESSURES IN MAMMALS Mammals are naturally distributed on all continents except Antarctica. They live in all oceans. EXTERNAL STRUCTURE AND LOCOMOTION SKIN The skin of a mammal consists of epidermal and dermal layers. It protects the animals from mechanical injury, microorganisms, and ultraviolet
CLASSIFICATION OF MAMMALS Class Mammalia Mammary glands: hair: diaphragm: three middle-car ossicles; heterodont dentition;sweat, sebaceous and scent glands: four- chambered heart; large cerebral cortex. (a) Subclass Prototheria This subclass formerly contained the monotremes. Monotremes have recently been reclassified, and this subclass now contains only
DIVERSITY OF MAMMALS Modern mammals have following characteristics: 1. They have hair on the body. 2. They have mammary glands. 3. They have specialized teeth. They have heterodont dentition 4. Three middle-car ossicics are present. 5. Diaphragm is present in them. 6. Their skin
MAMMALS EVOLUTIONARY PERSPECTIVE Tertiary period started about 70 million years ago. It was the start of the “age of mammals.” It produces adaptive radiation in the mammals. Extinction of many reptilian lineage also occurred in this period. The synapsid lineage of reptiles diverged from
OBJECTIVES OF BIRDS Multiple Choice Questions MCQs 1. The age of reptiles is: (a) Jurassic period (b) Tertiary period (c) Secondary period (d) Triassic period 2. Early synapsids were: (a) pulveosaurs (b) Therapsids (c)Parapsids (d) None 3. Diastema is present in: (a) Cynodonts
MULTIPLE CHOICE QUESTIONS AND FILL IN BLANKS OF STRUCTURE OF PLANTS PARTS 1. Casparian strips are present in (a) Cortex (b) Epidermis (c) Stele (d) Endodermis 2. The outer most part of the stele consists of one or more layers of parenchymatous cells. The
SHORT QUESTIONS OF STRUCTURE OF PLANT PARTS 1. Differentiate between tap and adventitious roots. Ans: Tap root arise from the embryo. Adventitious root develops from other mature tissues of plant like stem etc. 2. What are root hairs? Give their functions. Ans: A root
SUBJECTIVE QUESTIONS OF STRUCTURE OF PLANTS PARTS 1. Describe structure of root. 2. Give secondary growth in root. 3. Compare monocots and dicot roots 4. Describe structure of stem. 5. Compare monocot and dicot stems. 6. Discuss primary growth in stem. 7. Discuss secondary
DEFINITIONS AND KEY POINTS FOR OBJECTIVES OF STRUCTURE OF PLANTS PARTS
