The dark colored organic matter formed in the soil by the decomposition of animals and plants, is referred as:
A. Fossils
B. Humus
C. Chalk
D. Slit
Bacteria help to break dead:
A. Ends
B. Organic matter
C. Fossils
D. Alloys
Which of the following tools is more efficient for the production of electricity from the sun?
A. Galvanic cell
B. Solar cell
C. Lead cell
D. Dry cell
Repeated sessions of contraction and relaxation, are mainly associated with:
A. Supporting tissues
B. Nerve tissues
C. Muscle tissues
D. Epithelial tissues
Which of the following elements are called transition elements?
A. group A
B. Group B
C. both a and b
D. none of these
Light sensory cells which are linked to optical nerve, from _____.
A. Retina
B. Yellow spot
C. Blind spot
D. sclerotic
