Consider the following statements.
(A) Plant cells have centrioles which are absent in almost all animal cells.
(B) Ribosomes are the site of protein synthesis.
(C) The middle lamella is a layer mainly of calcium carbonate which holds the different neighbouring cells together.
(D) In an animal cell, steroidal hormones are synthesized by smooth endoplasmic reticulum.

Of the above statements

(A) and (B) only are correct

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(B) and (D) only are correct

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(A) and (D) only are correct

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(B) and (C) only are correct

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Solution

The correct option is C (B) and (D) only are correct
Ribosomes are naked ribonucleoprotein particles found in both pro- and eukaryotic cells. They are involved in protein synthesis. Smooth endoplasmic reticulum (SER) lack ribosomes. SER occurs in adipose cells, muscle cells, glycogen metabolising liver cells, steroid synthesizing cells, retinal cells etc.
Middle lamella is a cementing layer between two plant cells. Pectin is the main component. Middle lamella is chiefly composed of calcium and magnesium pectate (not calcium carbonate).
Centrioles are a characteristic of animal cells.

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