Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

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

The resolving power of a compound microscope will increase with

  1. Decrease in wave length of light and increase in numerical aperture.

  2. Increase in wave length of light and decrease in numerical aperture.

  3. Increase in both wave length of light and numerical aperture.

  4. Decrease in both wave length of light and numerical aperture.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Resolving power is the ability to distinguish two close objects as distinct. It is calculated by the formula 0.61 wavelength/ numerical aperture, where  numerical aperture is the light collecting ability of lens. It is clear that resolving power will be more if wavelength is less and numerical aperture is more. Thus, the correct answer is option A.

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

If the  magnification of ocular lens is 10x and objective lenses with the magnification of 10x, 20x, 30x, and 43x of microscope . Which of the following can not be achieved with this microscope?

  1. 10x

  2. 100x

  3. 200x

  4. 300x

  5. 430x
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Total magnification is calculated as (ocular lens magnification) * (objective lens magnification). With an ocular lens of 10x, the possible total magnifications are 10*10=100x, 10*20=200x, 10*30=300x, and 10*43=430x. 10x is not possible as the minimum magnification is 100x.

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

Antony Leeuwenhoek is known for

  1. Improvement of microscope

  2. Improvement of telescope

  3. Discovery of cell

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

Antonie van Leeuwenhoek used single-lens microscopes, which he made, to make the first observations of bacteria and protozoa. His extensive research on the growth of small animals such as fleas, mussels, and eels helped disprove the theory of spontaneous generation of life.

Hence, A is the correct option. 

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

Study of structure, physiology, biochemistry, development, evolution, genetics of a cell is called

  1. Cytology.

  2. Histology.

  3. Cell Biology.

  4. Molecular Biology.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Cell biology is the branch of biology that studies the structure and function of the cell, which is the basic unit of the life. 
  • Cell biology is also concerned with the physiological properties, metabolic processes, signalling pathways, life cycle, chemical composition and interaction of the cell with their environment. Hence, the study of structure, physiology, biochemistry, development, evolution, genetics of a cell is called cell biology.
  • So, the correct answer is 'cell biology'. 
Multiple choice botany cell and cellular organization cell theory microscope cell and its discovery

Living cells were first observed by

  1. Robert Hooke

  2. Schleiden

  3. Schwann

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

  • The first man to observe living cells was Anton Van Leeuwenhoek. He with his improved microscope, discovered free-living cells of algae Spirogyra in 1674 while examining his pond water. 

So, the correct answer is ' Leeuwenhoek'.

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

Study related to structure of cells is

  1. Cell biology

  2. Physiology

  3. Cytology

  4. Geology.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Cytology is the study of the cells, especially their appearance and structure. Cells are the small parts that make up all living things, and their effects on each other and their environment. There are two types of cells. Prokaryotic cells do not have a clear and easy-to-see nucleus and do not have a membrane, or wall, around them. Eukaryotic cells have an easy-to-see nucleus where all of the cell's functions take place and have a membrane around them. Hence, the study related to the structure of the cells is the cytology
  • So, the correct answer is 'cytology'.