Question

Match the following :

List I	List II
A. Cristae	1. Flat membranous sacs in stroma
B. Cisternae	2. Infolding
C. Thylakoids	3. Disc-shaped sacs in Golgi apparatus

• A. A- 2, B- 1, C- 3
• B. A- 1, B- 2, C- 3
• C. A- 2, B- 3, C- 1
• D. A- 2, B- 1, C-2

Answer 1

The correct option is C A- 2, B- 3, C- 1

The inner membrane of mitochondria is infolded variously to form involutions which are called cristae. They are meant for increasing the physiologically active area of the inner membrane. The density of cristae indicates the intensity of respiration.

Golgi apparatus consists of a stack of generally 4-8 membrane-bound cisternae. Cisternae are disc-shaped. Their membranes are smooth but of variable thickness. They enclose a lumen of 60-90 Angstrom. The cisternae are frequently curved to give a definite polarity to the Golgi apparatus.

Thylakoids are membrane lined flattened sacs which run through-out the stroma or matrix of the chloroplast. Since they take part in photosynthesis; they are also called photosynthetic thylakoids. Thylakoids are thus the structural elements of the chloroplast. They generally run parallel but may show interconnections. Thus, the correct answer is option C.