Which of the following animals belongs to the class Chondrichthyes?
A. Labeo rohita
B. Hippocampus
C. Pristis (Sawfish)
D. Catla catla
Answer: Option C
Solution (By JKExamLibrary)
Chondrichthyes are cartilaginous fishes with a skeleton made entirely of cartilage, a ventral mouth, and lack operculum. Pristis (sawfish), Scoliodon (dogfish), and Carcharodon (great white shark) belong to this class. Labeo rohita (Rohu) and Catla catla are Osteichthyes (bony fishes). Hippocampus (seahorse) is also a bony fish. Exam tip: Chondrichthyes = cartilaginous; Osteichthyes = bony.
Explanation:
Light reactions occur in the thylakoid membranes, where photosystems I and II, electron transport chains, and ATP synthase are located. Light energy is captured to produce ATP and NADPH and split water. The Calvin cycle (light-independent) occurs in the stroma.
Explanation:
Malaria, caused by Plasmodium parasites, is transmitted by the female Anopheles mosquito. Dengue and chikungunya are transmitted by Aedes mosquito, filariasis by Culex mosquito. Malaria remains a major global health concern.
Explanation:
A food chain shows the flow of energy from producer to consumers. Grass (producer) → Grasshopper (primary consumer/herbivore) → Frog (secondary consumer/carnivore) → Snake (tertiary consumer). Arrows point in the direction of energy flow. Option A has incorrect order, C and D start with consumer. Typically, energy decreases at each trophic level. This illustrates the correct trophic sequence.
No comments yet. Be the first to start the discussion!