Correct Answer: D. 305°

Correct Answer: D. high birth rate and low death rate

Correct Answer: D. brain and spinal cord

Correct Answer: C. a specialist enforces his directives

Correct Answer: C. Venezuela

Correct Answer: C. 2880J

Explanation

Power = current[I]\(^2\) * Resistance[R] → 2\(^2\) * 4 → 4 * 4 = 16watts

time = 3minutes → 3 * 60 = 180s

Energy = power * time → 16 * 180 = 2880j

Correct Answer: D) mitochondrion

Explanation

In Biology, respiration is the process by which cells produce energy. The question is asking us which organelle is responsible for tissue respiration. The options given are endoplasmic reticulum, ribosome, golgi body, and mitochondrion. The correct answer is Option D, mitochondrion. Mitochondria are often referred to as the powerhouses of the cell because they are responsible for producing most of the energy required by cells. They do this by breaking down glucose and other nutrients through a process called cellular respiration. This process takes place in the mitochondria and generates energy in the form of ATP. The other options given, such as endoplasmic reticulum and golgi body, are also important organelles in the cell, but they are not directly involved in tissue respiration. The ribosome is responsible for protein synthesis, not energy production. It's important to understand the functions of different organelles in the cell to have a good grasp of how cells work. Mitochondria are involved in various cellular processes, including cell signaling, cell differentiation, and cell death. For more information on this topic, please see the recommended textbooks.

Correct Answer: A. coarse

Correct Answer: C. x = 5

Explanation

x% of 240 = 12

\(\frac{x}{100} \times 240 = 12\)

x = \(\frac{12 \times 100}{240}\)

x = 5

Correct Answer: A. 5.6 cm

Explanation

\(\frac{PQ}{PR}=\frac{XZ}{XY}; \frac{PQ}{8}=\frac{3.5}{5}\\

PQ=\frac{8\times 3.5}{5}=\frac{28}{5}=5.6cm\)