• The Fundamental Unit of Life
Back
0

The Fundamental Unit of Life

Description: Science, IX, Biology, Fundamental Units of Life
Number of Questions: 15
Created by:
Tags: Biology Eukaryotic Cell Nucleus Structure Functions of Nucleus Fundamental Units of Life Structural Organization of a Cell Functions of Cell Wall Plasma Membrane or Cell Membrane Variation in Shape and Size of the Cells Mitochondria Functions Various Pigments Structure and Function of a Cell
Start the Quiz
Attempted 0/15 Correct 0 Score 0
‹
›

Which of the following is not a eukaryotic organism?

  1. Bread yeast

  2. Fungi

  3. Algae

  4. Bacteria

  5. Rhizaria

Show answer
Correct Option: D
Explanation:

The prokaryotes are a group of organisms whose cells lack a membrane-bound nucleus. Bacteria is a prokaryotic organism.

Which of the following scientists discovered the nucleus in the cell?

  1. Robert Brown

  2. Leeuwenhoek

  3. Robert Hooke

  4. Marcello Malpighi

  5. Rudolf Virchow

Show answer
Correct Option: A
Explanation:

Robert Brown discovered the nucleus in the cell in 1831.

Which of the following is a DNA molecule that also regulates all the functions of the cell?

  1. Chromoplast

  2. Cytoplasm

  3. Vacuole

  4. Nucleoid

  5. Cytosol

Show answer
Correct Option: D
Explanation:

The nucleoid is a circular DNA molecule that regulates all the functions of the cell.

All plants and animals are composed of cells. Who proposed this cell theory for the first time?

  1. Robert Hooke and Robert Brown

  2. Leeuwenhoek and J. E Purkinje

  3. M. Schleiden and T. Schwann

  4. J. E. Purkinje and M. Schleiden

  5. Robert Hooke and T. Schwann

Show answer
Correct Option: C
Explanation:

Schleiden in 1838 and Schwann in 1839 proposed the cell theory that all plants and animals are composed of cells.

Which of the following statements is/are correct? (a) The cytoplasm supports and protects the cell organelles that perform different metabolic functions. (b) The Golgi apparatus consists of stacks of flattened membrane-bound sacs or vesicles, these stacks are called cristae. (c) Animal cells are small, have no cell wall, and have small vacuoles.

  1. only a

  2. only b

  3. only c

  4. both a and c

  5. a, b and c

Show answer
Correct Option: D
Explanation:

Both b and c are correct. b is incorrect. 

Which of the following is the main constituent of the cell wall?

  1. Cytoplasm

  2. Protoplasm

  3. Cytosol

  4. Lysosome

  5. Cellulose

Show answer
Correct Option: E
Explanation:

Cellulose is a complex carbohydrate that is composed of glucose units, it forms the main constituent of the cell wall in most plants.

Which of the following is/are the correct statement(s)? (a) All cells change their shape frequently. (b) Flagella are responsible for motility. (c) Prokaryotic DNA is bounded by a nuclear membrane.

  1. a only

  2. b only

  3. c only

  4. both a and b

  5. both b and c

Show answer
Correct Option: B
Explanation:

Flagella are responsible for motility. This statement is correct.

What is endocytosis?

  1. It is a process in which a substance gains entry into a cell without passing through the cell membrane.

  2. It is a process of passage of liquid from its region of higher concentration through a semipermeable membrane to a region of low concentration.

  3. It is the movement of oxygen inside a cell from outside the cell.

  4. It is a process of cellular secretion or excretion in which substances contained in vesicles are discharged from the cell.

  5. It is the shrinkage or contraction of the protoplasm away from the wall of a living plant or bacterial cell.

Show answer
Correct Option: A
Explanation:

Endocytosis is a process in which a substance gains entry into a cell without passing through the cell membrane.

Which of the following is an incorrect statement?

  1. Plasmolysis is the shrinking of the cell away from the cell wall.

  2. Cytoplasm is the fluid living content between the plasma membrane and the nucleus.

  3. Some gases can move across the cell membrane by a process called diffusion.

  4. If the medium has exactly the same water concentration as the cell, there will be no net movement of water across the cell membrane.

  5. The nucleus has a multi-layered covering called nuclear membrane.

Show answer
Correct Option: E
Explanation:

The nucleus has a double layered covering, not a multi-layered covering, called nuclear membrane. This statement is incorrect. Hence, this option is correct.

Which of the following is/are correctly matched? (a) Kitchen of the cell - Chloroplast (b) Internal transport system - Golgi complex (c) Power house of the cell - Nucleus

  1. a only

  2. b only

  3. c only

  4. both a and b

  5. both b and c

Show answer
Correct Option: A
Explanation:

This is matched correctly. Chloroplasts are known as the kitchen of the cell.

Given below are some functions of cell organelles. Which of these is the function of the inner membrane of mitochondria?

  1. Plays a central role in cellular reproduction

  2. Contains DNA on which genes are present

  3. Site of cellular respiration

  4. The protein synthesizing site of the cell

  5. Storage units in cells

Show answer
Correct Option: C
Explanation:

Mitochondria is the site of cellular respiration in presence of oxygen and ATP formation. This is the correct function of the inner membrane of mitochondria.

Which of the following cell organelles has the given properties?

Directions: Read these properties carefully and answer the question that follows.
  
1. Found in plant cells only
2. Double membrane bounded structures
3. Do not have cristae but have extra nuclear DNA

  1. Mitochondria

  2. Cytoplasm

  3. Cytosol

  4. Protoplasm

  5. Plastids

Show answer
Correct Option: E
Explanation:

This is the correct answer. Plastids are found in plant cells only. They are double membrane bounded structures. They do not have cristae but have extra nuclear DNA. Chromoplasts are colored plastids and leucoplasts are colorless plastids.

Which of the following statements is incorrect?

  1. The nucleus contains cytoplasms, which are visible as rod-shaped structures, only when the cell is about to divide.

  2. The nuclear membrane has pores, which allow the transfer of material from inside the nucleus to outside.

  3. The functional segments of DNA are called genes.

  4. Rough endoplasmic reticulum has ribosomes on it.

  5. Viruses lack any membranes, and hence do not show characteristics of life until they enter a living body.

Show answer
Correct Option: A
Explanation:

Yes, this statement is incorrect, hence the correct answer. The nucleus contains chromosomes, not cytoplasms, which are visible as rod-shaped structures, only when the cell is about to divide. 

Which of the following organelles is the site for centrioles?

  1. In centrosomes of plant cell only.

  2. In centrosomes of animal cell only.

  3. In centrosomes of plant and animal cells.

  4. In cytoplasm of plant cell only.

  5. In cytoplasm of animal cell only.

Show answer
Correct Option: B
Explanation:

Centrioles are found in centrosome of animal cells only. This is the correct option.

Which of the following organelles make the endoplasmic reticulum rough?

  1. Ribosomes

  2. Lysosomes

  3. Vacuoles

  4. Cytoplasm

  5. Cytosol

Show answer
Correct Option: A
Explanation:

Ribosomes are small granules that synthesize proteins. Endoplasmic reticulum is the protein synthesizing site of the cell. Ribosomes make the endoplasmic reticulum rough.

- Hide questions
ADVERTISEMENT

Find more quizzes from top tags

general knowledge
3615 Quizzes
119858 Questions
 technology
307 Quizzes
36705 Questions
 sports
963 Quizzes
19148 Questions
 history
1187 Quizzes
13475 Questions
 physics
598 Quizzes
13441 Questions
 biology
1160 Quizzes
12174 Questions
 science & technology
551 Quizzes
11015 Questions
 chemistry
490 Quizzes
9892 Questions
 maths
518 Quizzes
9324 Questions
 softskills
0 Quizzes
7131 Questions