CBSE Class 9 Biology Worksheet - Diversity in Living Organisms
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Exam Questions NCERT Class 9 Science Chapter 7 Diversity In Living Organisms
Question. What are autotrophic bacteria? Give an example for autotrophic bacteria.
Ans : The bacteria which synthesize their own food from inorganic substances are called autotrophic bacteria.
Example : Nostoc, Anabaena.
Question. What are heterocysts?
Ans : The colourless specialized cells of nostoc filament meant for fixing atmospheric nitrogen are called heterocysts.
Question. What are chemosynthetic autotrophic bacteria?
Ans : The bacteria which oxidize inorganic substances like nitrate, nitrities and ammonia to release energy in the form of ATP are called chemosynthetic bacteria.
Question. What are mycoplasmas?
Ans : The smallest living organisms without cell walls and survive without oxygen are called mycoplasmas.
Question. What are planktons?
Ans : The microscopic organisms which floats on water are called planktons.
Question. Name the chemical component of cell wall of Diatoms.
Ans : Chitin.
Question. What are euglenoids?
Ans : The fresh water organisms found in stagnant water with protein rich particle in their cell wall are called euglenoids.
Question. What are plasmodium?
Ans : Aggregation of slime moulds under suitable conditions are called plasmodium, which may grow and spread over several feet. During unfavorable conditions they differentiate and follows fruiting bodies.
Question. Name parasitic protozoa.
Ans : Entamoeba, Plasmodium (Malarial parasite).
Question. Name the disease caused by Trypanosoma.
Ans : Sleeping sickness.
Question. What are the characteristic features of mammals?
Ans : Characteristic features of mammals :
(a) Body is covered with hair.
(b) Skin is provided with sweat and sebaceous glands.
(c) Heart is four-chambered.
(d) Fertilization is internal.
(e) Females have mammary glands to produce milk to nourish their young ones.
(f) External ear–pinna present.
(g) Eyes have eye lids.
(i) Respiration through lungs.
Question. What is the importance of heterotrophic bacteria?
(1) Conversion of milk to curd.
(2) Antibiotic productions.
(3) N2 fixation in leguminous roots.
(4) Act as pathogen, causing diseases like cholera, typhoid, tetanus.
(5) Damage corps (citrus canker disease)
(6) Act as ‘Scavengers of nature’ by decomposing dead and decaying organic matter.
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