Tag: evs

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

Layer of cells that secrete enamel of tooth is 

  1. Osteoblast

  2. Ameloblast

  3. Odontoblast

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

Osteoblast-bone forming cell. Ameloblast-enamel elaborating cell. Odontoblast- dentine elaborating cell. Dentoblast- tooth cell.

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

The teeth placed at the end of the buccal cavity and help in chewing food are which of the following?

  1. Incisors

  2. Molars

  3. Canines

  4. Premolars
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The most posterior teeth in the mouth are the molars. They have broader and flatter surfaces with 4-5 cusps. They help in chewing and grinding the food.
So the correct answer is 'Molars'.
Multiple choice evs let's plant trees damaging the forests deforestation and afforestation protecting our environment pollution of soil degradation of land

Which of the following provides nutrients to the seedlings to grow in forests?

  1. Bacteria

  2. Fungi

  3. Decaying animal dung

  4. Beetles and grubs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Animals living in the forest include herbivores and carnivores. The dung of these animals are decomposed by insects living in the soil. This contributes to the fertility of the soil by adding organic matter and nutrients, such as nitrogen, that is trapped by bacteria in the soil. This provides nutrients to the seedlings to grow in forests. Thus the correct answer is option C.

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

What is reforestation?

  1. Cutting of trees.

  2. Restocking of the destroyed forests by planting new trees.

  3. Conversion of fertile soil into forest.

  4. Conversion of forest into fertile soil.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Reforestation is restocking of the destroyed forest by planting new trees. We should plant at least as many trees as we cut. Reforestation can take place naturally also.

Thus, the correct answer is option B.

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

What is the effect of deforestation on amount of $CO _2$ in atmosphere?

  1. It increases

  2. It decreases

  3. It remains unchanged

  4. Cannot be predicted
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Deforestation is the permanent destruction of forests in order to make the land available for other uses. Deforestation has many negative effects on the environment. The most dramatic impact is a loss of habitat for millions of species. Seventy percent of Earth's land animals and plants live in forests, and many cannot survive the deforestation that destroys their homes. Deforestation also drives climate change. Since, trees purify air by absorbing carbon dioxide from atmosphere, loss of trees would result into increase in level of carbon dioxide.

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

Plants control the humidity in air by

  1. Photosynthesis

  2. Transpiration

  3. Photorespiration

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

Plants absorb water from the soil and looses it to the atmosphere by transpiration,hence,control the humidity in air by acting as a water exchanger between ground and atmosphere.