Which of the following is a characteristic of monocotyledonous plants?
A. Reticulate venation
B. Trimerous flowers
C. Taproot system
D. Two cotyledons
Answer: Option B
Solution (By JKExamLibrary)
Monocots typically have trimerous flowers (floral parts in multiples of three), parallel venation, fibrous roots, and one cotyledon. Dicots have reticulate venation, taproots, tetramerous/pentamerous flowers, and two cotyledons. Examples: grasses, lilies, orchids. These features are key in plant classification.
Explanation:
The right atrium receives deoxygenated blood from the body via the superior and inferior vena cavae. It then passes to the right ventricle, which pumps it to the lungs for oxygenation. The left atrium receives oxygenated blood from the lungs via pulmonary veins, and the left ventricle pumps it to the body. Thus, the right atrium is the receiving chamber for systemic deoxygenated blood.
Explanation:
O negative blood lacks A, B, and Rh antigens, so it can be transfused to any recipient without causing agglutination, making it the universal donor.
Explanation:
Viruses are non-living outside a host cell and cannot carry out metabolism or reproduce independently. They hijack the host cell's machinery to replicate. Hence they are obligate intracellular parasites. The reason correctly explains the assertion. Even though some debate exists on whether viruses are living, the statement that they are obligate parasites and lack metabolic machinery is accurate.
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