Question

A student was given cell samples (A and B) to identify parts which are highlighted. He observed the samples under the microscope and list down the function of the part of cell sample. The information collected by the student is listed in the table below, on the basis of which the student infers that the samples contain the organelles.

Sample A	Sample B
Make energy available for cellular metabolism	Generates ATP and synthesizes sugar
Absent in cell that carry oxygen throughout the body	Present in plant cell
Called the energy currency of cell	Source of all the food energy

Identify the components labelled as A, B, C, D and E in the diagram given below from the list (i) to (viii).

(i) Cristae of mitochondria
(ii) Inner membrane of mitochondria
(iii) Cytoplasm
(iv) Smooth endoplasmic reticulum
(v) Rough endoplasmic reticulum
(vi) Mitochondrial matrix
(vii) Ribosome
(viii) Nucleus

• A. (A) - (viii), (B) - (v), (C) - (vii), (D) - (iii), (E) - (iv)
• B. (A) - (i), (B) - (iv), (C) - (vii), (D) - (vi), (E) - (iii)
• C. (A) - (vi), (B) - (v), (C) - (iv), (D) - (vii), (E) - (i)
• D. (A) - (v), (B) - (i), (C) - (iii), (D) - (ii), (E) - (iv)

Answer 1

Answer: (A)

In the given diagram of endoplasmic reticulum, the components marked as A, B, C, D and E are respectively nucleus (viii), rough endoplasmic reticulum (v), ribosomes (vii), cytoplasm (iii) and smooth endoplasmic reticulum (iv). Endoplasmic reticulum is a network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane. It usually has ribosomes attached and is involved in protein and lipid synthesis.