Which of the following is the simplest living organism?

• A. Paramecium
• B. Virus
• C. Amoeba
• D. Chlamydomonas

An organism which exhibit extracellular digestion is

• A. Spirogyra
• B. Paramecium
• C. Amoeba
• D. Rhizopus

The organ located in the mammalian abdominal cavity just below the diaphragm and lying on top of the stomach is the

• A. bladder
• B. intestine
• C. liver
• D. pancreas

Cholera is mostly spread by_______

• A. air
• B. soil
• C. water
• D. noise

Species X has lived in the forest for many years. One day, some individuals in the Species X forest population moved to the mountains, away from the native habitat in which they had lived for so long. A large river then developed between the mountains and the forest, separating the two environments. None of the Species X individuals in the forest could travel to the mountains and none in the mountains could come back to the forest. Gradually, over time, the individuals that had moved to the mountains became increasingly different from the animals that remained in the forest. Eventually, the Species X individuals that moved to the mountains became so different from those in the forest that they could no longer breed with one another. Which of the following best describes this type of speciation?

• A. Sympatric speciation
• B. Peripatric speciation
• C. Allopatric speciation
• D. Parapatric speciation

The function of ribosome in cells is

• A. protein synthesis
• B. starch synthesis
• C. transport of material
• D. lipid storage

When it is cold, the blood vessels of the skin

• A. dilates to increase the amount of blood flowing
• B. constrict to reduced the amount of blood flowing to the skin
• C. dilate to reduce the amount of blood flowing to the skin
• D. constrict to increase the amount of blood flowing to the skin

Which of the following organelles are likely to be present in cells that are actively respiring and photosynthesizing?

• A. Nucleolus and centrioles
• B. Mitochondria and chloroplast
• C. Lysosomes and ribosomes
• D. Golgi apparatus and endoplasmic reticulum

During anaerobic respiration in skeletal muscles, pyruvic acid is

• A. reduced to lactic acid
• B. oxidized to ethanol
• C. oxidized to lactic acid
• D. reduced to water

In cold condition the mammalian body reacts in the following ways except

• A. shivering of the body
• B. dilation of the capillaries supplying blood to the skin
• C. constriction of blood capillaries in the skin
• D. increased rate of chemical changes in the body