Tag: evs

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Multiple choice evs structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

The major reason for tooth decay are 

  1. Chocolates

  2. Sweets

  3. Cold drinks

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

Tooth decay is the softening of teeth enamels and refers to the damage of the structure of the tooth. This occurs due to high consumption of chocolates, sweets and cold drinks. Tooth decay is caused by acids that are created when plaque bacteria break down sugar in the mouth. 

So, the correct answer is  'All of the above'.

Multiple choice evs structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

The measures to prevent tooth decay are

  1. Dental floss

  2. Brush

  3. Rinsing the mouth after meals

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

Tooth decay starts with the erosion of tooth enamel and leads to holes in teeth called cavities. The measures to prevent tooth decay are to brush the teeth twice a day, dental floss, skip sugar, rising the mouth after meals.

So the correct answer is "All of the above". 

Multiple choice evs digestion of food diseases caused by changes in lifestyle nutrition deficiency diseases study of ecological pyramids

The energy and biomass relationship between the organisms at different trophic levels can better expressed by.

  1. Food chain

  2. Food web

  3. Ecological pyramids

  4. Energy cycle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
An ecological pyramid (also trophic pyramid, eltonian pyramid, energy pyramid, or sometimes food pyramid) is a graphical representation designed to show the biomass or bio productivity at each trophic level in a given ecosystem. Biomass pyramids show how much biomass (the amount of living or organic matter present in an organism) is present in the organisms at each trophic level, while productivity pyramids show the procreation or turnover in biomass. There is also pyramid of numbers which represent the number of organisms in each trophic level. They may be upright (e.g. Grassland ecosystem), inverted (parasitic ecosystem) or dumbbell shaped (forest ecosystem). Energy pyramids begin with producers on the bottom (such as plants) and proceed through the various trophic levels (such as herbivores that eat plants, then carnivores that eat flesh, then omnivores that eat both plants and flesh, and so on). The highest level is the top of the food chain.
So the correct option is 'ecological pyramid'.
Multiple choice evs digestion of food diseases caused by changes in lifestyle nutrition deficiency diseases study of ecological pyramids

Pyramid of bio mass and number in a pond ecosystem ake-

  1. inverted and upright

  2. inverted and irregular

  3. both upright

  4. both unverted
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is the graphical representation which shows the biomass or bio productivity in an eco system at each tropical level.

Therefore the right answer is option "A, inverted and upright".

Multiple choice evs digestion of food diseases caused by changes in lifestyle nutrition deficiency diseases study of ecological pyramids

The concept of ecological pyramids was proposed by 

  1. Elton

  2. Odum

  3. Darwin

  4. Clement
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A (elton) is the correct answer.

Elton proposed the concept of ecological pyramids Ecological pyramid is a graphical representation that shows the biomass at each trophic level. Odum is the father of modern ecology. Clements proposed the theory of plant succession. darwin proposed the theory of biological evolution by natural selection.

Multiple choice evs digestion of food diseases caused by changes in lifestyle nutrition deficiency diseases study of ecological pyramids

When peacock eats snakes which eats insects thriving on green plants, the peacock is

  1. A primary consumer

  2. A primary decomposer

  3. Final decomposer

  4. The apex of food pyramid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the given food chain peacock is the ultimate consumer. It will be located at the apex of the food pyramid. 

Green plants will be producers. 
Insects feeding on green plants will be herbivores or primary consumers. Snakes will be primary carnivores or secondary consumers and peacock will be a secondary carnivore or a tertiary consumer. Thus, the correct answer is option D.

Multiple choice evs digestion of food diseases caused by changes in lifestyle nutrition deficiency diseases study of ecological pyramids

In the food and energy pyramid, the sequence-from base upwards is?

  1. Aquatic insects-fishes-flowering plants-trees

  2. Primitive animals-higher animals-man who plants and animals-carnivorous animals

  3. Plants animals that eat plants animals that eat plants and animals-carnivorous animals

  4. Aquatic plants-terrestrial plants carnivorous animals-large trees man
Reveal answer Fill a bubble to check yourself
C Correct answer