Cell Theory

Q.

Define a cell.

Q.

What does Omnis cellula-e cellula mean?

Q.

Select the statements which are related to Schwann.
(i) He reported that cells have a thin outer layer which is today known as plasma membrane
(ii) Cell wall is a unique character of the plant cell.
(iii) Body of plants and animals are composed of cells and products of cells.

1. Only (i)
2. Only (iii)
3. (i) and (iii)
4. (i), (ii) and (iii)

Q.

Describe the shortcomings of cell theory.

Q. Which of the following is NOT one of the main components of cell theory?

1. Cells require water for its survival.
2. All living organisms are made of cells.
3. New cells can only come from other cells.
4. Cells are the basic unit of life.

Q.

The cell theory was proposed by________.

Q.

Cell are formed de novo from abiotic material.true or fakse

Q.

*What are the main points of the cell theory?

Q. Centrioles are present in ___________.

1. plant cells
2. animal cells
3. bacteria
4. algae

Q. Cell theory was formulated by

1. Schleiden and Schwann
2. Rudolf Virchow
3. Robert Brown
4. Robert Hooke

Q. Assertion: Analogous organs have different origins but similar functions
Reason: Analogous structures show divergent evolution

1. Both the assertion and reason are true and the reason is a correct explanation of the assertion
   
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion
   
3. Assertion is true but the reason is false
   
4. Both assertion and reason are false
   

Q. Match the following:

	Column I		Column II
A	Anton Von Leeuwenhoek	i	Omnis cellula-e cellula
B	Robert Brown	ii	Formulated the first cell theory
C	Schleiden and Schwann	iii	Discovered the nucleus
D	Rudolf Virchow	iv	First saw and described a live cell

1. A-iv, B-iii, C-i, D-ii
2. A-iii, B-iv, C-ii, D-i
3. A-iv, B-iii, C-ii, D-i
4. A-iv, B-ii, C-iii, D-i

Q.

Potato and sweet potato have edible parts which are

1. Homologous

2. Analogous

3. Recent introductions

4. None of the above

Q. Read the following three statements (i - iii) and mark the right option.
(i) The thorns in Bougainvillea and tendrils in cucurbits represent divergent evolution.
(ii) The similarity in the eyes of octopus and monkeys is the result of convergent evolution.
(iii) The potato and sweet potato are the examples of homology.

1. (i) and (ii) correct
2. (ii) and (iii) correct
3. (i) and (iii) correct
4. All are correct

Q.

The wings of bats and wings of birds are called analogous organs. Why?

Q. The cell theory is not applicable to:

1. Algae
2. Fungi
3. Viruses
4. Lichens

Q.

Briefly give the contributions of the following scientists in formulating the cell theory

(a) Rudolf Virchow

(b) Schleiden and Schwann

Q. The cell theory is not applicable to

1. bacteria
2. virus
3. algae
4. Fungi

Q.

Who modified cell theory?

Q.

Which of the following is not correct?

(a) Robert Brown discovered the cell.

(b) Schleiden and Schwann formulated the cell theory.

(c) Virchow explained that cells are formed from pre-existing cells.

(d) A unicellular organism carries out its life activities within a single cell.

Q. Omnis cellula-e cellula is generalisation given by

1. Virchow
2. Leeuwenhoek
3. Lamarck
4. Dutrochet

Q.

An organism with two copies of same allele is _______ for that trait.

Q. What does cell theory state?

1. Cell is a basic unit of life
2. Cell is important only for reproduction
3. Cell is an over-crowded unit
4. None of the above

Q. The cell theory is one of the unifying themes of biology. Which of the following statements would be part of the cell theory?

1. All life is made of cells.
2. Cells come from pre existing cells.
3. All of the above
4. Cells are the smallest units of life.

Q.

Question 25

Briefly describe the cell theory.

Q. 'Omnis-cellula-e-cellula' was given by

Q. Homologous organs are

1. Wings of insects and Bat
2. Wings of Grasshopper and Crow
3. Pectoral fins of Fish and forelimbs of Horse
4. Gills of Fish and lungs of Rabbit

Q. By what Latin name the first hominid was known?

Q.

Where did cells come from?

Q. Which postulate of the cell theory has practical applications in healthcare because it promotes the use of sterilization and disinfection?

1. All cells come from pre-existing cells
2. All living organisms are composed of one or more cells
3. A cell is the basic unit of life
4. A nucleus and organelles are found in prokaryotic cells