Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology mineral nutrition in plants hydroponics nutrients and nutrition hydroculture

Match the following essential elements(List I) with their respective roles(List-II) and select the correct answer.

List-I List-II
a. Chlorine $1$. Constituent of plastocyanin
b. Copper $2$. Constituent of nitrate reeducates
c. Molybdenum $3$. Constituent of alcohol dehydrogenate
d. Zinc $4$. Required for $CO _2$ evolution in photosynthesis
$5$. Required for phosphate transfer
  1. A-$4$, B-$1$, C-$3$, D-$2$
  2. A-$1$, B-$2$, C-$5$, D-$3$
  3. A-$1$, B-$4$, C-$5$, D-$2$
  4. A-$4$, B-$1$, C-$2$, D-$3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chlorine is required for water splitting (evolution of O2), Copper is a constituent of plastocyanin, Molybdenum is a constituent of nitrate reductase, and Zinc is a constituent of alcohol dehydrogenase.

Multiple choice biology mineral nutrition in plants hydroponics nutrients and nutrition hydroculture

When we boil tulsi leaves in water, water acquires a characteristic smell of leaves because

  1. Smell of leaves diffuse in water

  2. Leaves melt in water

  3. Stored wastes in the leaves dissolve in water

  4. Leaves pollute water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water acquires a characteristic smell because the smell of leaves diffuse in water, tulsi leaves never melt in water or pollute water.

So, the correct option is 'Smell of leaves diffuse in water'.

Multiple choice biology mineral nutrition in plants hydroponics nutrients and nutrition hydroculture

There is no direct transfer of electron from cyt b to cyt c as

  1. Energy is not available

  2. The two are not nearby

  3. Electrons are transported in pairs

  4. Electrons have no affinity for cytochromes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the electron transport chain, cytochrome b and cytochrome c are separated by the Q-cycle and the Rieske iron-sulfur protein. They are not directly adjacent in the membrane complex.

Multiple choice biology mineral nutrition in plants hydroponics nutrients and nutrition hydroculture

Choose the correct answer from the alternatives given.
Hydroponics is a technique of growing:

  1. submerged Plants

  2. free-floating aquatic plants

  3. terrestrial plants in sand

  4. plants in aqueous balanced nutrient medium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hydroponics is a subset of hydroculture, which is a method of growing plants without soil by using mineral nutrient solutions in a water solvent. Terrestrial plants may be grown with only their roots exposed to the mineral solution, or the roots may be supported by an inert medium, such as perlite or gravel. So, the correct answer is "plants in the aqueous balanced nutrient medium".

Multiple choice biology mineral nutrition in plants hydroponics nutrients and nutrition hydroculture

State whether the following statements are true or false.
Transfusion tissue is the substitute of lateral veins as it helps in the conduction of water.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer A: True
Transfusion tissue immediately surrounding at least part of the vascular bundles in the leaves of gymnosperms, e.g. Pinus. Transfusion tissue is composed of tracheids (transfusion tracheids) with conspicuous bordered pits , and parenchyma cells (transfusion parenchyma) containing tannin-like substances and sometimes starch. The main function of the transfusion tissue is believed to be the transport of materials between the vascular bundles and the mesophyll.

Multiple choice biology diseases and hygiene anaemia mosquito and human health non communicable diseases

Why foods derived from genetically modified crops required to be tested for possible allergic reactions in people?

  1. They may cause allergies due to release of new kind of proteins.

  2. They may not be digested.

  3. They may cause more hunger.

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

The process of creating a GM crop can produce many changes in the natural functioning of the plant's genome. Native genes can be mutated, deleted, permanently turned on or off and may change their levels of protein expression. This increasing the levels of an existing protein or even producing a completely new and unknown protein within the crop can act as an allergen in consumers. Hence, foods derived from genetically modified crops are required to be tested for possible allergic reactions in people.

Multiple choice biology diseases and hygiene anaemia mosquito and human health non communicable diseases

Allergic reaction occur due to release of 

  1. Hormones

  2. Histamines

  3. Enzymes

  4. Lysozymes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • An allergic reaction occurs due to the hypersensitivity of the immune system to a harmless substance known as an allergen.
  • Antibodies are produced by the B-lymphocyte cells which destroy the allergens.
  • Destruction of allergens by the antibodies causes the release of a chemical substance into the bloodstream called histamine. 
  • The release of histamine in a large amount causes swelling of body tissues (inflammation), itching, enlargement of blood vessels and causes bronchospasm.
  • So, the correct answer is 'Histamines'.
Multiple choice biology diseases and hygiene anaemia mosquito and human health non communicable diseases

Sting of _______cause allergy.

  1. Butterfly

  2. Grasshopper

  3. Ant

  4. Bee
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Sting of bee causes allergy.
  • When a bee stings it releases bee venom into the human body which triggers allergic reactions.
  • The bee venom contains proteins which affect the skin cells and triggers the immune system to produce antibodies called Immunoglobulin that results in pain and swelling at the site of the sting.
  • So, the correct answer is 'Bee'.