Tag: biology

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Multiple choice biology mineral nutrition in plants hydroponics hydroculture essential and non-essential mineral elements

The basic principle of aeroponics includes

  1. Growing plants in a suspended or closed environment.

  2. Growing plants by callus culture.

  3. Growing plants in the presence of growth hormones.

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

Aeroponics is a method of growing plants with their roots suspended in the air in a grow chamber. The chamber contains the water-based solutions that is used to promote healthy growth in the plants. Water is pumped from the reservoir into the mirco-jet nozzles which distribute the nutrient solution to the roots at definite intervals. This is an enclosed system i.e. whatever does not get absorbed by the roots falls back down into the solution chamber and gets cycled through again. The microbes on the plant are in an oxygen-rich environment. This allows the microbes time to digest the nutrients and to make them immediately available for the plant’s use. Well-circulating CO2 in the room also enhances growth. Thus the correct answer is option A.

Multiple choice biology mineral nutrition in plants hydroponics hydroculture essential and non-essential mineral elements

The method of growing plants by using air in absence of soil or any artificial medium?

  1. Aeroponics

  2. Hydroponics

  3. Suspension culture

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Aeroponics is a method of growing plants with their roots suspended in the air in a chamber. Nutrient-rich water is sprayed on the roots of the plants. The microbes on the plant are in an oxygen-rich environment. This allows the microbes time to digest the nutrients and to make them immediately available for the plant’s use. Well-circulating CO$ _2$ in the room also enhances growth. 
Thus the correct answer is option A.
Multiple choice biology mineral nutrition in plants hydroponics hydroculture essential and non-essential mineral elements

Why is aeroponics considered as an advantageous process?

  1. It can reduce disease transmission.

  2. It has reduced labour steps.

  3. It can be cloned easily.

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

Aeroponics is a soilless method of growing plants. It is done in an enclosed or semi-enclosed chamber. Thus disease transmission is reduced. No land area for plant growth is required. Hence it reduces labour step. It is cost effective because the nutrients that are not absorbed by the roots during a spraying session fall back into the reservoir. Thus the correct answer is option D.

Multiple choice biology mineral nutrition in plants hydroponics hydroculture essential and non-essential mineral elements

Aeroponics is growing plants in

  1. Air

  2. Satellites

  3. Other planets and space

  4. Stands with liquid spray of their roots
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aeroponics is the technique of growing plants in air. The roots of the plants hang in air supplied with nutrients and water on a regular basis. 

Here the soil is not required for growing the plant because the fulfillment of the nutrients of the plant is getting done through the regular mist of the nutrients spray.

Multiple choice biology organization of life the cell structure cytoplasm number and shape of cells

The term cytoskeleton was given by

  1. Koltzoff

  2. Rhodin

  3. Menke

  4. Park
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Cytoskeleton refers to the complex network of interlinking filaments and tubules which extend throughout the cytoplasm of the cell from the nucleus to the plasma membrane.
  • They are composed of microtubules, actin filaments and intermediate filaments. 
  • They give shape and support to the cell and also facilitates movement within the cell (cytoplasmic streaming or cyclosis).
  • It was discovered by Nikolai K. Koltsov in the year 1903.
  • So, the correct answer is 'Koltzoff'.
Multiple choice biology organization of life the cell structure cytoplasm number and shape of cells

Cytokinesis is a division of:

  1. Cytoplasm

  2. Nucleus

  3. chromosomes

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

Cytokinesis is the process of division of Cytoplasm. "Kinesis" means division and "cyto" refers to cytoplasm. it occurs during cell division. It is variable from plant cells to animal cells.

So, the correct option is 'Cytoplasm'.

Multiple choice biology organization of life the cell structure cytoplasm number and shape of cells

 Select the correct statement _________________________.

  1. Histone protein is present in all prokaryotes but absent in animal cell

  2. ER is absent in eukaryotes but presents in prokaryotes

  3. Nuclear membrane is absent in prokaryotes but nuclear membrane is present in eukaryotes

  4. Ribosome is present in eukaryotic cells but absent in prokaryotic cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Nucleus is well defined in eukaryotes and nuclear membrane is present.
Histone proteins and endoplasmic reticulum (ER) are present in eukaryotes. Ribosomes are present in both eukaryotes and prokaryotes.
Hence, the correct answer is 'Nuclear membrane is absent in prokaryotes but nuclear membrane is present in eukaryotes'.
Multiple choice biology organization of life the cell structure cytoplasm number and shape of cells

End of prophase is marked by?

  1. Initiation of condensation of chromosomal material

  2. Complete disintegration of nuclear membrane

  3. Reappearance of ER, Golgi body, nucleolus and nuclear envelop

  4. Alignment of chromosomes at the equator
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Prophase is the first phase of mitosis, during which chromatin condenses into visible chromosomes and the mitotic spindle begins to form. The end of prophase and transition to prometaphase is classically marked by the complete breakdown and disappearance of the nuclear membrane.

Multiple choice biology organization of life the cell structure cytoplasm number and shape of cells

Cells capable of division are

  1. Stem cells.

  2. Meristematic cells.

  3. Undifferentiated cells.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Stem cells are totipotent cells that can able to differentiate and divide into any type of cells of the body. meristematic cells are undifferentiated cells of the plants that can able to divide and form tissues, organs of the plant. so cells capable of division are all the cells including stem cells, meristematic cells and undifferentiated cells. Hence option D is correct.