Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany cell and cellular organization cell theory microscope cell and its discovery

Which microscope is best to study cell division in functional state?

  1. EM

  2. SEM

  3. Phase contrast microscope

  4. Simple microscope
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Phase contrast microscopy is particularly important in biology. It reveals many cellular structures that are not visible with a simpler bright field microscope. These structures were made visible to earlier microscopists by staining, but this required additional preparation and killed the cells. The phase contrast microscope made it possible for biologists to study living cells and how they proliferate through cell division. So, phase contrast microscope is best to study cell division in functional state compared to EM, SEM and simple microscope.

Multiple choice botany cell structure and micro-organisms cell theory microscope cell and its discovery

The first person to see a living cell under the microscope was__________ 

  1. M.J. Schleiden

  2. Schwann

  3. Antonie Van Leeuwenhoek

  4. Robert Hook
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The first person to see a living cell under the microscope was Antonie van Leeuwenhoek. 
  • He called that cell as animalcule. He is commonly known as "the Father of Microbiology", and considered to be the first microbiologist. 
Multiple choice botany cell structure and micro-organisms cell theory microscope cell and its discovery

Cell lineage theory proposed by ___________________

  1. Schleiden

  2. Schwann

  3. Rudolph Virchow

  4. Hooke
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The cell is the basic structural and functional unit of life. Schleiden proposed that new cells arise from within the old cells, especially from the nucleus. 
  • This was corrected by Rudolf Virchow who proposed, "Theory of cell lineage" it states that all cells arise from pre-existing cells.
Multiple choice botany cell and cellular organization cell theory microscope cell and its discovery

The figures of cork cells as seen by Robert Hooke were published in his book called as_______________

  1. Origin of Species

  2. Plant Kingdom

  3. Genera Plantarum

  4. Micrographia
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Robert Hooke discovered cell in the year 1665. He observed cork cell in the bark of Spanish oak tree under a simple microscope and was able to see the empty structures surrounded by walls and named it a cell. 
  • He elucidated his observation in a book called "Micrographia.
Genera Plantarum is a publication of Swedish naturalist Carl Linnaeus (1701–1778). 

Multiple choice botany cell and cellular organization cell theory microscope cell and its discovery

Hooke observed as boxes or cells in the cork were actually .......... cell.

  1. Living

  2. Dead

  3. Both A and B

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Robert Hooke discovered cell in the year 1665. He observed cork cell in the bark of Spanish oak tree under a simple microscope and was able to see the empty structures surrounded by walls and named it a cell. 
  • He elucidated his observation in a book called "Micrographia". He was unable to see the organelles inside the cell as cork cell which he observed was dead.
Multiple choice botany cell and cellular organization cell theory microscope cell and its discovery

The first person to see a cell under the microscope was _______________

  1. M. Schleiden

  2. T. Schwann

  3. R. Hooke

  4. A. Leeuwenhoek
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The invention of the microscope allowed the first view of cells. English physicist and microscopist Robert Hooke (1635–1702) first described cells in 1665. He made thin slices of cork and likened the boxy partitions he observed to the cells (small rooms) in a monastery. The open spaces Hooke observed were empty, but he and others suggested these spaces might be used for fluid transport in living plants. He did not propose, and gave no indication that he believed, that these structures represented the basic unit of living organisms.

Leeuwenhoek (1672) assembled a simple microscope and observed bacteria, protozoa, red blood cells etc.
Schleiden and Schwann proposed the cell theory.
Therefore, the correct answer is option C.

Multiple choice botany cell structure and micro-organisms cell theory microscope cell and its discovery

Magnification power of a light compound microscope depends on

  1. Power of eye piece lens

  2. Power of an occular lens

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The power of magnification of a microscope is the product of the powers of the occular (eyepiece) and the objective lens. The maximum normal magnifications of the occular and the objective are 10x and 100x respectively, giving a final magnification of 1,000x.

Multiple choice botany cell and cellular organization cell theory microscope cell and its discovery

Robert Hooke

  1. Lived in the 19$^{th}$ century.

  2. Observed cork cells.

  3. Invented lens.

  4. Constructed a microscope.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Robert Hooke discovered cell in the year 1665. He observed cork cell in the bark of Spanish oak tree under a simple microscope and was able to see the empty structures surrounded by walls and named it a cell. He elucidated his observation in a book called "Micrographia".