The largest and most diverse phylum in the animal kingdom is:
A. Mollusca
B. Arthropoda
C. Chordata
D. Annelida
Answer: Option B
Solution (By JKExamLibrary)
Arthropoda is the largest phylum, with over a million described species, including insects, arachnids, crustaceans, and myriapods. They are characterized by jointed appendages, chitinous exoskeleton, and segmented bodies. Insects alone represent the majority of animal species. Chordata is comparatively smaller.
Explanation:
Intervertebral discs are fibrocartilaginous joints (symphyses) that allow slight movement and absorb shock. Hinge joints are in knee/elbow, ball-and-socket in hip/shoulder, sutures are immovable fibrous joints in skull.
Explanation:
Max Theiler developed the attenuated yellow fever vaccine (17D strain) in the 1930s, winning the Nobel Prize. Pasteur rabies, Jenner smallpox, Salk polio.
Consider the following statements about biodiversity:
1. Biodiversity includes genetic, species, and ecosystem diversity.
2. Hotspots are regions with high endemism and habitat loss.
3. The Western Ghats is a biodiversity hotspot.
Which of the above is/are correct?
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