In mammals, the organ which performs digestive and endocrine functions is the

• A. liver
• B. pancreas
• C. gastric gland
• D. salivary gland

The organs that will be most useful to giant African rats in finding their way in underground habitats are the

• A. vibrissae
• B. nostrils
• C. eyes
• D. tails

Which of the following scientists did not contribute to the development of genetics?

• A. Wilhem Johannsen
• B. Felix Durjadin
• C. Thomas Morgan
• D. Gregor Mendel

The movement of part of a plant in response to external stimulus of no particular direction is?

• A. taxism
• B. tropism
• C. haptotropic movement
• D. nastic movement

The membrane around the vacuole is known as

• A. Elaioplast
• B. Amyloplast
• C. Tonoplast
• D. Cytoplast

When the adults have reach a certain degree of weakness, the process of binary fission is replaced by conjugation in

• A. Paramecium
• B. Euglena
• C. Amoeba
• D. Plasmodium

Which of the following substances cannot control the growth of harmful micro organisms?

• A. Antibiotics
• B. Hypertonic salt solution
• C. Disinfectants
• D. isotonic sugar solution

The property of clayey soil that prevents it from supporting thick vegetation is its?

• A. composition of chemically weathered granite rocks
• B. inability to retain much water
• C. tendency of becoming waterlogged
• D. porosity and low water retention ability

The salinity of a brackish habitat________

• A. increases immediately after rainfall
• B. increases at the end of the rain
• C. decreases with an increase in the number of organisms
• D. increases during the dry season

The thoracic vertebra differs from all the other vertebrae by the possession of

• A) long neural spine
• B) odontoid process
• C) vertebraterial canal
• D) large centrum