Tag: evs

Quizzes (439) Questions (4580)

Questions Related to evs

Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion

Well developed digestive system is present in

  1. Cnidarians, prawns and earthworms

  2. Grasshoppers, frogs and houseflies

  3. Amoeba, Hydra and dog

  4. Sponges, flatworms and earthworms
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Porifera (sponges), Platyhelminthes (flatworms) and Cnidaria (Hydra) do not have a well-developed digestive system. They have 'blind-sac' body plan, with an opening that serves as both the mouth and the anus, and a gastrovascular cavity where digestion takes place.

Earthworms and Arthropods (Grasshoppers, houseflies) have a well-developed digestive system, having a compartmentalized alimentary canal and two-openings, anterior as mouth and posterior as the anus. 
The vertebrates (frogs) also have a well developed digestive system.
Hence, the correct answer is 'Grasshoppers, frogs and houseflies'

Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion

When compared to the mammals, birds are less sensitive to temporary deprivation of water, because

  1. Urea excretion in mammals entails a greater loss of water than that in birds

  2. Absorption of Water horn the gut is more efficient in birds that in mammals

  3. The water requirement per unit weight is less in birds than in mammal

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

Birds and reptiles have uric acid as their nitrogenous waste. 

The uricotelic organism excretes uric acid in form of a white paste or powder.
this uric acid is advantaged over the urea which is excreted in mammals in certain ways because it is less toxic and reduces water loss and thus it also reduces the need for water for excretion.

So, the correct option is 'Urea excretion in mammals entails a greater lass of water than that M birds'

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Carbon dioxide is associated with:

  1. Elements

  2. Mixture

  3. Compound

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon dioxide is a naturally occurring chemical compound composed of 2 oxygen atoms each covalently double bonded to a single carbon atom. It is a gas at standard temperature and pressure and exists in Earth's atmosphere in this state, as a trace gas at a concentration of $0.04 \%$ by volume.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Example of an element is:

  1. Water

  2. Sodium hydroxide

  3. Hydrogen

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

A chemical element is a pure chemical substance consisting of a single type of atom distinguished by its atomic number, which is the number of protons in its atomic nucleus. If you change the number of protons an atom has, you change the type of element it is.

Here, hydrogen is an element while water, sodium hydroxide and sugar are compounds made up of more than elements.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Classification of matter helps us to:

  1. study things systematically

  2. share information with others

  3. know the properties of all the members of a group if we know about one

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

Classification of matter helps us to:


(i) Know the properties of all members of a group if we know about one.


(ii) Study things systematically.

(iii) Share information with others.


Option D is correct.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Which among the following is associated with iron sulphide ?

  1. Element

  2. Mixture

  3. Compound

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Iron(II) sulfide or ferrous sulfide is a chemical compound with the formula $FeS$. Iron sulfides are often non-stoichiometric. powdered iron sulfide is pyrophoric (ignites spontaneously in air).

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

The property that we use for classifying things depends on the ___________ of the classification.

  1. grouping

  2. purpose

  3. information

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

Things are always classified to make 

(i)easy identification of things.
(ii)Can know all properties of group if we know about one element in the group.
The property that we use  for classifying things depend on the purpose of classification.