Which branch of biology deals with the study of external form and structure of organisms?
A. Anatomy
B. Morphology
C. Physiology
D. Histology
Answer: Option B
Solution (By JKSSB Mock Tests)
Morphology is the study of the form and external structure of organisms. Anatomy deals with internal structures, physiology with functions, and histology with tissues. Morphology includes aspects like shape, size, color, and pattern.
Explanation:
Aldosterone, secreted by the adrenal cortex, increases sodium reabsorption (and water follows) and potassium secretion in the distal tubule and collecting duct. ADH increases water reabsorption only. Renin is an enzyme, natriuretic peptides inhibit sodium reabsorption.
Explanation:
Rhizobium species form symbiotic root nodules in legumes and fix atmospheric nitrogen into ammonia. Azotobacter is free-living, Nitrosomonas nitrifies, Lactobacillus ferments.
Explanation:
Chitin is a polymer of N-acetylglucosamine, forming the tough exoskeleton of arthropods and the cell wall of fungi. Cellulose is a plant polysaccharide, starch and glycogen are energy storage polysaccharides in plants and animals respectively. Chitin provides protection and support.
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