CBSE Class 11 Biology – MCQ and Online Tests – Unit 8 – Cell: The Unit of Life
Every year CBSE schools conducts Annual Assessment exams for 6,7,8,9,11th standards. These exams are very competitive to all the students. So our website provides online tests for all the 6,7,8,9,11th standard’s subjects. These tests are also very effective and useful for those who preparing for any competitive exams like Olympiad etc. It can boost their preparation level and confidence level by attempting these chapter wise online tests.
These online tests are based on latest CBSE syllabus. While attempting these our students can identify the weak lessons and continuously practice those lessons for attaining high marks. It also helps to revise the NCERT textbooks thoroughly.
CBSE Class 11 Biology – MCQ and Online Tests – Unit 8 – Cell: The Unit of Life
Question 1.
The main site for synthesis of lipids is
(a) vacuoles
(b) RER
(c) SER
(d) Golgi body
Answer
Answer: (c) SER
Explanation:
The main site for synthesis of lipid is smooth endoplasmic reticulum.
Question 2.
The function of ribosomes is
(a) metabolism
(b) lipid synthesis
(c) protein synthesis
(d) photosynthesis
Answer
Answer: (c) protein synthesis
Explanation:
Ribosomes are called protein factories because they synthesize proteins.
Question 3.
Which of the following does not have cell wall?
(a) Mycoplasma
(b) Bacteria
(c) PPLO
(d) Blue green algae
Answer
Answer: (a) Mycoplasma
Explanation:
Mycoplasma does not have cell wall.
PPLO (Pleuro Pneumonia Like Organisms)
Question 4.
Plasmolysis occurs due to-
(a) Absorption
(b) Endosmosis
(c) Osmosis
(d) Exosmosis
Answer
Answer: (d) Exosmosis
Question 5.
The term Cell was given by-
(a) Leeuwenhoek
(b) Robert hooke
(c) Flemming
(d) Robert Brown
Answer
Answer: (b) Robert hooke
Question 6.
Which one of the following also acts as a catalyst in a bacterial cell?
(a) 23 sr RNA
(b) 5 sr RNA
(c) sn RNA
(d) hn RNA
Answer
Answer: (a) 23 sr RNA
Question 7.
Centrosome is found in-
(a) Cytoplasm
(b) Nucleus
(c) Chromosomes
(d) Nucleolus
Answer
Answer: (a) Cytoplasm
Question 8.
Plasma membrane is
(a) impermeable
(b) semi-permeable
(c) completely permeable
(d) differentially permeable
Answer
Answer: (b) semi-permeable
Explanation:
Plasma membrane is a selective permeable membrane that allows only selective molecules to pass through it.
The permeability depends on the electric charge and polarity of the molecules.
Question 9.
Middle lamella is made up of ___________.
(a) calcium sulphide
(b) calcium pectate
(c) calcium carbonate
(d) calcium chloride
Answer
Answer: (b) calcium pectate
Explanation:
Middle lamella is made up of calcium pectate.
Question 10.
Centrosome is found in-
(a) Cytoplasm
(b) Nucleus
(c) Chromosomes
(d) Nucleolus
Answer
Answer: (a) Cytoplasm
Question 11.
Cell secretion is done by-
(a) Plastids
(b) ER
(c) Golgi apparatus
(d) Nucleolus
Answer
Answer: (c) Golgi apparatus
Question 12.
___________ increases the surface area for mitochondrial activity.
(a) Inner membrane
(b) Inter membrane space
(c) Matrix
(d) Cristae
Answer
Answer: (d) Cristae
Explanation:
The inner membrane forms a number of foldings called cristae towards the matrix. These cristae increases the surface area.
Question 13.
The longest cell in human body is
(a) red blood cells
(b) white blood cells
(c) columnar epithelial cells
(d) nerve cells
Answer
Answer: (d) nerve cells
Explanation:
Nerve cells are the longest cells.
Question 14.
Which is called Suicidal Bag?
(a) Centrosome
(b) Lysosome
(c) Mesosome
(d) Chromosome
Answer
Answer: (b) Lysosome
Question 15.
The cytoplasmic connections from cell to cell are known as
(a) middle lamella
(b) plasmodesmata
(c) cell membrane system
(d) endoplasmic reticulum
Answer
Answer: (b) plasmodesmata
Question 16.
Bacterial flagella is made up of
(a) tubulin
(b) flagellin
(c) chitin
(d) None of these
Answer
Answer: (b) flagellin
Explanation:
Bacterial flagella is made up of protein flagellin.
Question 17.
A nucleosome is a portion of the chromonema containing ______.
(a) both DNA and histones
(b) only histones
(c) both DNA and RNA
(d) only DNA
Answer
Answer: (a) both DNA and histones
Question 18.
The largest cell in the human body is-
(a) Nerve cell
(b) Muscle cell
(c) Liver cell
(d) Kidney cell
Answer
Answer: (a) Nerve cell
Question 19.
Keeping in view the fluid mosaic model for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as flip-flop movement)?
(a) Neither lipids, nor proteins can flip-flop
(b) Both lipids and proteins can flip-flop
(c) While lipids can rarely flip-flop, proteins can not
(d) While proteins can flip-flop, lipids can not
Answer
Answer: (c) While lipids can rarely flip-flop, proteins can not
Question 20.
Match the columns.
1. Cytoskeleton – A. hair-like outgrowth
2. Flagella – B. proximal region of centriole
3. Hub – C. bristle-like structures
4. Fimbriae – D. filamentous protein structure
(a) 1-D, 2-A, 3-B, 4-C
(b) 1-D, 2-C, 3-B, 4-A
(c) 1-B, 2-D, 3-A, 4-C
(d) 1-D, 2-A, 3-C, 4-B
Answer
Answer: (a) 1-D, 2-A, 3-B, 4-C
Explanation:
A filamentous protein structure present in the cytoplasm is called cytoskeleton.
Flagella is a hair-like outgrowths of the cell membrane.
The central part of the proximal region of the centriole is called hub.
Fimbriae are small bristle like fibres sprouting out of the cell.
0 comments:
Post a Comment