Tag: evs

Questions Related to evs

The major reason for tooth decay are 

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

  1. Chocolates

  2. Sweets

  3. Cold drinks

  4. All of the above

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Correct Option: D
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'.

The measures to prevent tooth decay are

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

  1. Dental floss

  2. Brush

  3. Rinsing the mouth after meals

  4. All of the above

Show answer
Correct Option: D
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". 

Which of the following is a soft material in the tooth?

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

  1. Dentine

  2. Pulp

  3. Enamel

  4. Root

Show answer
Correct Option: B
Explanation:

Pulp is the soft material in the tooth it is richly supplied with blood vessels and nerves.

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

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

  1. Food chain

  2. Food web

  3. Ecological pyramids

  4. Energy cycle

Show answer
Correct Option: C
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'.

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

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

  1. inverted and upright

  2. inverted and irregular

  3. both upright

  4. both unverted

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Correct Option: A
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".

The concept of ecological pyramids was proposed by 

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

  1. Elton

  2. Odum

  3. Darwin

  4. Clement

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Correct Option: A
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.

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

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

  1. A primary consumer

  2. A primary decomposer

  3. Final decomposer

  4. The apex of food pyramid

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Correct Option: D
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.

Mass of living matter at a tropic level in an area at any time is called______________.

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

  1. Standing state

  2. Standing crop

  3. Detritus

  4. Humus

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Correct Option: B

The narrow apex of pyramid is called _____________.

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

  1. Papillary duct of Bellini

  2. Calyx

  3. Column of bertini

  4. Pelvis

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Correct Option: A

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

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

  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

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Correct Option: A