Tag: evs

Questions Related to evs

Protective components of foods are 

  1. Minerals and vitamins

  2. Minerals, carbohydrate and proteins

  3. Minerals, carbohydrate and fats

  4. Vitamins, water and carbohydrate


Correct Option: A
Explanation:

Protective components of foods are minerals and vitamins. Vegetables like spinach, cabbage, brinjal, beans, and fruits are called protective foods. These components protect us from diseases. Hence, they are called protective components of food. Carbohydrates and fats are the energy components of the food. Proteins are bodybuilding components of the food. 

Thus, the correct answer is 'Minerals and vitamins.'

The nutrient synthesized by plants through photosynthesis is

  1. Proteins

  2. Carbohydrates

  3. Hormones

  4. Fats


Correct Option: B
Explanation:

The nutrient synthesized by plants through photosynthesis is carbohydrates. Plants are autotrophs and they synthesize their own food by the process of photosynthesis. During photosynthesis, they convert carbon dioxide and water in presence of sunlight and chlorophyll to produce carbohydrates (glucose) and oxygen. 

Thus, the correct answer is 'Carbohydrates.'

___________ is an inorganic nutrient.

  1. Nitrogen

  2. Urea

  3. Glucose

  4. Glycine


Correct Option: A
Explanation:

An inorganic nutrient is essentially any compound or element that is not carbon-based, but is otherwise necessary to maintain health and optimum growth of a plant, animal, or human. Nitrogen is an inorganic nutrient that is later converted to organic forms like nitrite, nitrate or ammonia.

The most important component formed by plants which is useful for the growth is

  1. Carbohydrates

  2. Proteins

  3. Fats

  4. None of the above


Correct Option: B
Explanation:

Proteins are major element required in the growth of the plant cells. In plants, all the 20 amino acids should be formed in the plant body because they cannot take them up fro any other source. Proteins are essential as they are the basic constituents of enzymes, cell membrane, and transport systems.

So, the correct option is 'Proteins'

Carbohydrate is made up of all except

  1. Carbon

  2. Nitrogen

  3. Oxygen

  4. Hydrogen


Correct Option: B
Explanation:

Carbohydrates, as the name suggests, are the hydrates of carbon and thus are made up of molecules of hydrogen, oxygen and carbon.

These are generally represented as Cx(H₂O)y. 
These are the essential constituents of all the living beings.
So, the correct option is 'Nitrogen'

Stomata do not occur in ________.

  1. Algae

  2. Liverworts

  3. Mosses

  4. Ferns.


Correct Option: A
Explanation:
To allow the plant to retain water and exchange gases, small pores (holes) in the leaves called stomata also evolved. In algae, vascular tissue is not necessary as the entire body is in contact with the water, and the water and gases simply enters the algae through diffusion.
So, the correct answer is 'Algae'

Sea Lettuce is _____________.

  1. Laminaria

  2. Chlorella

  3. Sargassum

  4. Alva


Correct Option: D
Explanation:
Alva lactuca's common name is sea lettuce, because  it looks a bit like lettuce underwater. It has a disc shaped holdfast that it uses to attach onto hard substrate.
So, the correct answer is 'Alva'

The most important character which is used in classifying different algae is

  1. Cell wall structure

  2. Habit

  3. Types of pigments

  4. None of the above


Correct Option: C
Explanation:

The seven divisions of organisms that are considered within the algae are the Euglenophyta, Chrysophyta, Pyrrophyta, Chlorophyta, Rhodophyta, Paeophyta, and Xanthophyta. These divisions are separated on the basis of various features including their morphology and the biochemistry of their pigments, cell walls, and energy-storage compounds. The colors of these various algae types differ according to their particular mixtures of photosynthetic pigments, which typically include a combination of one or more chlorophylls and various accessory pigments.

Slimy, green patches in ponds or in stagnant water is

  1. Fungi

  2. Bryophytes

  3. Bacteria

  4. Algae


Correct Option: D
Explanation:

One of the simplest multicellular organisms is algae. They are seen growing in the freshwater of marine habitats. They are also eukaryotic organisms. Algae can grow rapidly when exposed to stagnant waters. An adequate amount of sunlight, temperature and aquatic habitat leads to the rapid growth of slimy, green patches containing chlorophyll called algae.


So, option D 'Algae' is the correct answer.

Cell wall of Chlamydomonas possesses _____________.

  1. Cellulose

  2. Glycoproteins

  3. Hemicellulose

  4. Proteins only.


Correct Option: B
Explanation:

The cell wall of the unicellular green alga Chlamydomonas consists of glycoproteins, which also occurs in the extracellular matrix of multicellular green algae and higher plants.

So, the correct answer is 'Glycoproteins'