Tag: botany

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Questions Related to botany

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

The instrument used to observe cells is

  1. Stethoscope

  2. Microscope

  3. Manometer

  4. Endocardiogram
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • A microscope is an instrument, which is used for observing very small objects. 
  • It uses lens or combination of lenses to produce a magnified image of tiny objects, which are not visible to the naked eyes. 
  • Cells are also very small, which cannot be seen by the naked eyes. Hence, a microscope is used to observe cells. So option B is correct.
Multiple choice botany cell and cellular organization cell theory microscope cell and its discovery

Which one of the following is surrounded by a callose wall ?

  1. Pollen grain

  2. Microspore mother cell

  3. Male gamete

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

The deposition of callus occurs around the Microspore Mother Cell (MMC) prior to the cell undergoing meiotic division. The division results in the formation of a cluster of 4 haploid cells the microspores. These cells are held together by the callose to form a microspore tetrad. The callose deposition allows the development of the microspores into pollen grains by preventing them from sticking to each other. After complete development of the pollen the callose wall is disintegrated.

So, the correct answer is 'Microspore mother cell'

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

Unicellular microscopic organisms were first studied by

  1. Robert Hooke

  2. Priestley

  3. Pasteur

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

Most of the "animalcules" are now referred to as unicellular organisms, although Leeuwenhoek observed multicellular organisms in pond water. He was also the first to document microscopic observations of muscle fibers, bacteria, spermatozoa, red blood cells, crystals in gouty tophi, and blood flow in capillaries.

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

Zernike was awarded Noble prize for the discovery of

  1. TEM

  2. SEM

  3. Fluorescent microscope

  4. Phase contrast microscope
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Frits Zernike invented phase contrast microscopy which was proved to be an advancement in microscopy. He was awarded Nobel prize in Physics in 1953.
Phase contrast microscopy is a optical microscopy technique that converts phase shifts in light passing through a transparent specimen to brightness changes in the image.

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

The only microscope which gives 3D images is

  1. Compound microscope

  2. Electron microscope

  3. Scanning electron microscope

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

Scanning electron microscopes do provide 3D images but not naturally. However, 3D images can be obtained by different methods such as:
Photogrammetry where 2 or 3 images are there from tilted specimen.
Photometric stereo where there is use of 4 images from detector.

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

Very high wavelength rays are used in one of the following microscope.

  1. Fluorescent

  2. Polarising

  3. Ultraviolet

  4. Phase contrast
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fluorescence is the emission of light by a substance that has absorbed light. Here, the emitted light has a longer wavelength and, therefore, lower energy than the absorbed radiation.

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

Binding of specific proteins on regulatory DNA sequences can be studied by means of

  1. Electron microscope

  2. Light microscope

  3. Centrifugation

  4. X-ray crystallography
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The detailed structural views of protein-DNA interfaces have been obtained through X-ray crystallography and NMR spectroscopy.

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

Zernike was awarded Noble prize for the discovery of 

  1. TEM

  2. SEM

  3. Fluorescent

  4. Phase contrast microscope
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Phase contrast microscope was developed by Zernike and in 1953 he got noble prize for this discovery. The microscope has a phase plate and an annular diaphragm. They bring about changes in light rays passing through the specimen producing differences in light intensity. Denser parts, alter path of light more than the thinner parts. This produces varying contrast for different regions. The microscope is useful in the study of small living organisms, living cells, constituents of living cells, effect of various factors over living structures, and study of various cellular events like behaviour of chromosomes during mitosis and meiosis, spindle formation, cytokinesis, pinocytosis, phagocytosis, cyclosis, glandular secretions, spermatogenesis, oogenesis etc.
So, the correct answer is 'Phase contrast microscope'.
Multiple choice botany cell and cellular organization cell theory microscope cell and its discovery

The branch of biology dealing with structure, function and reproduction of cell is 

  1. Cytology

  2. Anatomy

  3. Histology

  4. Cell biology
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Cell biology is the study of all aspects of cells and their components including their structure, biochemistry, development and physiology. It treats the cell as fundamental unit of life.
So, the correct answer is 'Cell biology'.