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A. Live only on living host Explanation: Reference: A Textbook of Plant Pathology By A.V.S.S. Sambamurty, Page no: 20.
B. Are essentially parasites but can also become saprophyte
C. Live only on dead and decaying organic matter
D. Are essentially saprophytes but can also becomes parasites
Some parasites, including viruses, viroids, mollicutes, some fastidious bacteria, nematodes, protozoa, and of the fungi those causing downy mildews, powdery mildews, and rusts, are biotrophs, that is they can grow and reproduce in nature only in living hosts, and they are called obligate parasites.
A. Left atrium Explanation: Reference: NCERT Biology Text, Class: XI, Unit V: Human Physiology, Chapter 18: Body Fluids and Circulation & Essential AS Biology By A. G. Toole, S. M. Toole, Page no: 152.
B. Right atrium
C. Right ventricle
D. Left ventricle
Structure of the heart
1. The human heart is divided into four chambers:
• Two atria (the upper chambers)
• Two ventricles (the lower chambers)
2. The ventricles have thicker walls than the atria. The left ventricle has a thicker muscular wall than the right ventricle. This allows the left ventricle to exert more force on the blood inside it when contracting.
3. The right and left sides of the heart are separated by the septum.
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