Tag: evs

Questions Related to evs

What are the advantages of reforestation?

evs let's plant trees damaging the forests deforestation and afforestation protecting our environment pollution of soil degradation of land

  1. It helps to reduce the concentration of CO$ _2$ in the environment.

  2. It has the potential to preserve endangered species.

  3. It can reverse the damage done by erosion.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

Deforestation results in an increase in CO$ _2$ concentration in the atmosphere, greenhouse gasses like CO$ _2$ and methane significantly contribute to a changing climate. Reforestation involves the planting of the trees of same species. It is an effective method to reduce CO$ _2$ in the atmosphere, it also helps in restoring habitat loss and also helps in fighting against climate change and help in restoring endangered species from extinction.

Thus, the correct answer is option D.

Which of these is an example of an ecological intervention?

I. Toxic site remediation
II. Large-scale reforestation
III. Introduction of new species

evs let's plant trees damaging the forests deforestation and afforestation protecting our environment pollution of soil degradation of land

  1. I only

  2. II only

  3. III only

  4. I and III only

  5.  I, II and III

Show answer
Correct Option: E
Explanation:
Ecological intervention is use of conventional ways to deal with environment emergencies for its protection and conservation.
I. Toxic site remediation is the removal of contaminants and other polluting substances from the site.
II. Large scale reforestation is the plantation of trees for removing pollution from the atmosphere.
III. Introduction of new species to increase the biodiversity is also a conventional way of ecosystem conservation.
So, the correct answer is 'I, II and III'.

Calcium and ............. gives rigidity to bones and teeth 

evs structure and functions of living organisms -ii role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

  1. Oxalate

  2. Pectate

  3. Carbonate

  4. Phosphate

  5. Sulphate

Show answer
Correct Option: D
Explanation:
Phosphorus is found within the skeleton and teeth, where it is compounded with calcium to form calcium phosphate.  It is a primarily component of hydroxyapatite crystals in bones and teeth, and help in rigidity to the softer portions. 
So the correct answer is D.

The number of teeth that grow twice in human life is 

evs structure and functions of living organisms -ii role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

  1. 4

  2. 12

  3. 20

  4. 28

Show answer
Correct Option: C
Explanation:

20 milk teeth of a child get replaced in adulthood by 20 permanent teeth. But the rest 12 can never be replaced if broken, these 12 teeth grow only once in a man’s life.
So, the correct option is '20'.

The primary dentition in human differs from permanent dentition in not having one of the following type of teeth

evs structure and functions of living organisms -ii role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

  1. Canine

  2. Premolars

  3. Molars

  4. Incisors

Show answer
Correct Option: B
Explanation:

There are 20 primary teeth which are lost as the child grows and is replaced by 32 permanent teeth. Primary dentition comprises of 8 incisors, 4 canines and 8 molars while permanent teeth comprises of 8 premolars in addition to newly formed 8 incisors, 4 canines and 12 molars. Premolars take the place of molars present in the primary dentition.

What is the main source of energy for Earth?

evs solar energy solar power plant production of electricity from solar energy solar energy and its applications

  1. Moon

  2. Plants

  3. Humans

  4. Sun

Show answer
Correct Option: D
Explanation:

Sun is the ultimate source of energy because all renewable and non renewable sources are ultimately derived form sun.

We get solar energy which can be put to many uses. 

Which of the following &fare not correctly matched pairs ?

(i) Ball and socket joint - Between humerus and pectoral girdle
(ii) Pivot joint - Between carpal and metacarpal
(iii) Saddle joint - Between atlas and axis 
(iv) Gliding joint  - Between the carpals
(v) Fibrous joint - In flat skull bones
evs our skeletal system and the skin bones and movements joints in the human body joints bones

  1. (ii) and (iii)

  2. (i) and (iv)

  3. (v) Only

  4. (ii) Only

Show answer
Correct Option: A
Explanation:

In the given table options i and iv are correctly matched.

So, the correct option is '(i) and (iv)'.

 Match column I with column II and select the correct option from the codes given below:

Column I Column II
A. Saddle joint (i) Metacarpo-phalangeal joint
B. Gliding joint (ii) Carpometacarpal joint of thumb
C. Hinge joint (iii) Between tarsal bones
D. Ellipsoid joint (iv) Knee joint
evs our skeletal system and the skin bones and movements joints in the human body joints bones

  1. A-(i), B-(ii), C-(iii), D-(iv)

  2. A-(ii), B-(iii), C-(iv), D-(i)

  3. A-(iv), B-(iii), C-(ii), D-(i)

  4. A-(iii), B-(ii), C-(iv), D-(i)

Show answer
Correct Option: B
Explanation:
 Column I  Column II
 Saddle joint  Carpometacarpal joint of the thumb
 Gliding joint between tarsal bones
 Hinge joint  Knee joint
 Ellipsoid joint   Metacarpophalangeal joint
   

So, the correct option is 'A-(ii), B-(iii), C-(iv), D-(i)'.

Hips are attached to

evs our skeletal system and the skin bones and movements joints in the human body joints bones

  1. scapula

  2. sternum

  3. clavide

  4. ilium

Show answer
Correct Option: D
Explanation:

The pelvic girdle is located in the lower part of the trunk. It consists of three bones that are upper ileum, lower ischium and inner pubis, they fuse to form a stout hip bone. Ventral wall of the pubis has a small bone which is known as cotyloid. The acetabulum is formed by ilium, ischium and pubis, but in mammals, pubis is replaced by cotyloid bone.

So, the correct option is 'ilium'

Match the two columns and select the correct option from the codes given below.

Types of Bones synovial joint  Bones  involved 
A. Ball and socket (i) Carpal and metacarpal of thumb
B. Hinge (ii) Atlas and axis
C. Pivot (iii) Frontal and parietal
D. Saddle (iv) Knee(v) Humerus and pectoral girdle
evs our skeletal system and the skin bones and movements joints in the human body joints bones

  1. A-(v), B-(iv), C-(ii), D-(i)

  2. A-(i), B-(iii), C-(iv), D-(v)

  3. A-(v), B-(iv), C-(iii), D-(i)

  4. A-(i), B-(ii), C-(v), D-(iv)

Show answer
Correct Option: A
Explanation:
 A. ball and socket  v humerus and pectoral girdle
 B. hinge   iv knee
 C. pivot  ii atlas and axis
 D. saddle  i carpal and metacarpal of the thumb