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Standard VII
Biology
Cells
Question

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

  1. (A) and (B) only are correct
  2. (C) and (D) only are correct
  3. (B) and (D) only are correct
  4. (A) and (D) only are correct
  5. (B) and (C) only are correct

A
(A) and (B) only are correct
B
(C) and (D) only are correct
C
(B) and (D) only are correct
D
(A) and (D) only are correct
E
(B) and (C) only are correct
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Solution
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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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Similar Questions
Q1
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

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Q2
Consider the following statements

A. Centrioles are present in almost all animals cells.
B. Ribosomes are the site of protein synthesis.
C. The middle lamella is the layer made up of calcium carbonate which holds the neighboring cells together.
D. In animal cells, steroidal hormones are synthesized by smooth endoplasmic reticulum.
The true statements are

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Q3
Consider the following statements
(a) Lysosomes keep the cells clean by digesting foreign materials.
(b) Ribosomes are present in eukaryotic cells only.
(c) The ER (endoplasmic reticulum) functions both as passageway for intracellular transport and as a manufacturing surface.
Which of the above statements are correct?
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Q4
Read the given statements (a - c) & select the correct ones.
a) Schleiden reported plasma membrane as a thin outermost layer of animal cells.
b) Unicellular organisms are capable of independent existence but do not perform all essential functions of life.
c) In a cell, ribosomes are not found only in the cytoplasm but also within and on the cell organelles.
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Q5

DIRECTIONS: The following questions have four choices (a), (b), (c) and (d) out of which only one is correct. You have to choose the correct alternative.

Lipids and proteins constituting the cell membrane are synthesized at:


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