cells are of__________types?
cells are of__________types?
		A. 4
B. 3
C. 2
D. 1
cells are of__________types?
		A. 4
B. 3
C. 2
D. 1
The molecules of living matter that provide building blocks are mostly based on:
		A. Carbon
B. Nitrogen
C. Hydrogen
D. Ammonia
The atoms of different elements combine with each other through ionic or covalent bonding to produce compounds this stable form is called__________?
		A. An organ
B. A molecule
C. Tissue
D. Both a and c
A smallest contractile unit of muscle contraction called sarcomere is the area between two:
		A.	H- zone
B.	M- Line
C.	Z- Line
D.	A band
Roots of a plant show______________?
		A. Positive phototropism and negative geotropism
B. Negative phototropism and positive geotropism
C. Negative tactic movement and positive tropic movement
D. Positive geotropism of stem and roots
The concept that various organisms dominated this planet during various geological time period and thus placing organisms in a time squence came from the studies by ?
		A. Environmental biologist
B. Paleontologist
C. Marine biologist
D. Social biologist
Secondary cell wall of sclerenchyma cells is impregnated with_________________?
		A. Cellulose.
B. Peptidoglycan and murein.
C. Lignin.
D. Pectin.