The normal pH of human blood is_____.

1. 1. 6.4
   2. 7.4
   3. 7.5
   4. 8.5

Photosystem I (PSI) has a chlorophyll molecule which absorbs maximum light of _____ nm.

1. 1. 600
   2. 650
   3. 680
   4. 700

The element in basic structure of proteins which differentiate them from carbohydrates_____.

1. 1. C
   2. S
   3. H
   4. N

Aquatic animals excrete nitrogenous waste commonly in the form of_____.

1. 1. Urea
   2. Ammonia
   3. Trimethylamine oxide
   4. Uric acid

The branch of Biology which deals with the use of data and techniques of engineering & technology concerning living organisms is _____.

1. 1. Human Biology
   2. Genetics
   3. Bio-technology
   4. Environmental Biology

Which of the following is not a viral disease?

1. 1. Tetanus
   2. Mumps
   3. Small pox
   4. Cowpox

In animals coordination is achieved by means of_____.

1. 1. Respiratory system
   2. Nervous system
   3. Endocrine system
   4. Both b and c

Lungs are covered with double layered thin membranous sac called_____.

1. 1. Rib cage
   2. Disphragm
   3. Pericardium
   4. Pleura

Marine fish can keep their internal environment hypertonic with respect to the surrounding salty water by retaining_____.

1. 1. Trimethylamine oxide
   2. Ammonia
   3. Trimethyl alanine
   4. Excessive urea which will increase their internal solute concentration and prevent body shrinkage in hypertonic environment

Biometry is the application of_____in biology.

1. 1. Matrix
   2. Statistics
   3. Geometry
   4. Algebra