The most abundant element present in plants is                               [2004]

1. Carbon

2. Nitrogen

3. Manganese

4. Iron

The major portion of the dry weight of plants comprises of                  [2003]

1. Carbon, nitrogen and sulphur

2. Carbon, nitrogen and oxygen

3. Nitrogen, phosphorous and potassium

4. Calcium, magnesium and sulphur

Most abundant organic compound on earth is                     [2001,2004]

1. Protein

2. Cellulose

3. Lipids

4. Steroids

About 98% of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and:

1. Phosphorous and sulphur

2. Sulphur and magnesium

3. Magnesium and sodium

4. Calcium and phosphorous

Which of the following elements is present in higher proportion [% weight of the total] in Earth's crust with respect to the average composition of a human body?

1. Carbon

2. Nitrogen

3. Sulfur

4. Magnesium

In an average composition of a cell, the maximum % of total cellular mass [after water and protein] is constituted by:

1. Carbohydrates

2. Lipid

3. Nucleic acids

4. Ions

The six most common atoms in organic molecules are:

Which of the following is not a polymeric substance?

(1) Nucleic acid               

(2) Proteins

(3) Polysaccharides           

(4) Lipids

Which one is the most abundant protein in the animal world?

1. Trypsin                     

2. Haemoglobin

3. Collagen                   

4. Insulin

In a 50 gm living tissue, what would be the amount of water?

1. 15-25 gm

2. 25-30 gm

3. 35-45 gm

4. 70-90 gm