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Biology Biology Difficulty: Medium

In most triploblasts after embryonic development the three layers are represented as___________? Which type of pathogen causes the water-borne disease dysentery? The food conducting tissue of a plant is __________ ? Consider the following statements 1. Pasteur's swan neck experiment proved that new organisms arise from pre-existing ones. 2. Theory of Use and Disuse of Organs was given by Lamarck. 3. Darwin wrote the book 'On the Origin of Species by Means of Natural Selection' in 1859. 4. Lamarck wrote the book 'Philosophie Zoologique'. Which of the statements given above is/are true? Part of the vascular strand of the leaf which is present in the stern as a lower portion of the vascular supply to the leaf is called the