Tag: evs

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Questions Related to evs

Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

Choose the right sequential phenomena among the following during the delivery of $O _2$ from blood tissue.
P : Absorption of $CO _2$ by the blood.
Q : Reaction of absorbed $CO _2$ with $H _2O$ to form $H _2CO _3$ within RBC and its conversion into $H^+$ and $HCO^{-} _{3}$ ions in the presence of carbonic anhydrase enzyme.
R : Reaction of absorbed $CO _2$ with $H _2O$ in plasma to form $H _2CO _3$ and its conversion into $H^+$ and $HCO^{-} _{3}$ ions in the presence of carbonic anhydrase enzyme.
S : Combination of $H^+$ with heme portion of $HbO _2$ to release $O _2$.
T : Combination of $HCO^{-} _{3}$ with heme portion $HbO _2$ to form reduced hemoglobin and release of $O _2$.

  1. P, Q, T

  2. P, R, S

  3. P, Q, S

  4. P, R, T
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The sequence is: P (CO2 absorption), Q (formation of H+ and HCO3- in RBC via carbonic anhydrase), and S (H+ ions bind to HbO2, causing the release of O2 via the Bohr effect).

Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

Choose the correct answer from the alternatives given.
What is name of the iron-containing protein that gives red blood vessels their colour?

  1. Haemoglobin

  2. Hemocyanin

  3. Pyrite

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

The presence of haemoglobin, the red pigment in the red blood cells (RBCs) makes blood appear red in colour. The haemoglobin carries oxygen and transports it to all the parts of the body.

So, the correct option is 'Haemoglobin'.

Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

Correct statement regarding Mitochondria and Chloroplast
A. ATP synthesis is seen in both
B. Outer membrane has more surface in both
C. Circular naked DNA, RNA and 70 ribosomes are seen in both
D. Oxidative phosphorylation occurs in both

  1. A and B

  2. B and C

  3. A and C

  4. A and D
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chloroplasts are very similar to mitochondria but are found only in the cells of plants and some algae.ATP synthesis is present in both Mitochondria and Chloroplast and the outer membrane has not more surface in both.

So, the correct option is 'A and C'.

Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

Which of the following chairs of haemoglobin is affected in thalassaemia?

  1. Only $\beta$ chain
  2. Only $\alpha$ chain
  3. Both $\alpha$ and $\beta$ chain
  4. $\gamma$ chain
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Thalassaemia is a group of inherited blood disorders characterized by reduced synthesis of either the alpha or beta globin chains of haemoglobin, leading to abnormal haemoglobin production.

Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

Choose the correct answer from the alternatives given.
Which of the following are components of blood?

  1. Plasma

  2. Blood cells and platelets

  3. Gases and other dissolved substances

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The composition of blood is :
1. Blood plasma- 54.3% It contains proteins, amino acids, nitrogenous wastes, nutrients, gases, electrolytes.
2. Red Blood Cells-45%
3. White Blood Cells- 0.7 %
4. Platelets
So, the correct option is 'All of the above'.
Multiple choice evs mud and stones soil - formation and profile soil-nature soil profile

The weathering of rocks is caused by 

  1. Wind, water, and climate

  2. Only wind, and clay

  3. Only wind, and water

  4. Wind, water, and gravel
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Weathering is the breakdown of rocks through multiple physical and chemical processes. Wind causes physical abrasion, water contributes through erosion and chemical reactions, and climate (temperature variations, freezing-thawing) creates stresses that fracture rocks over time.

Multiple choice evs mud and stones soil - formation and profile soil-nature soil profile

Soil has five components. The proportions of different components are

  1. Mineral Matter-$40\%$, Organic Matter-$10\%$, Soil Moisture -$25\%$, Soil Atmosphere -$25\%$, Soil Organism- Variable
  2. Mineral Matter-$40\%$, Organic Matter-$10\%$, Soil Moisture -$25\%$, Soil Atmosphere - $25\%$, Soil Organism- $10\%$
  3. Mineral Matter-$40\%$, Organic Matter-$10\%$, Soil Moisture -$35\%$, Soil Atmosphere -$25\%$, Soil Organism- $10\%$
  4. Mineral Matter-$30\%$, Organic Matter-$20\%$, Soil Moisture -$25\%$, Soil Atmosphere -$25\%$, Soil Organism- $10\%$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

While a nearly infinite variety of substances may be found in soils, they are categorized into four basic components: minerals, organic matter, air and water. Most introductory soil textbooks describe the ideal soil (ideal for the growth of most plants) as being composed of 45% minerals, 25% water, 25% air, and 5% organic matter. In reality, these percentages of the four components vary tremendously. Soil air and water are found in the pore spaces between the solid soil particles. The ratio of air-filled pore space to water-filled pore space often changes seasonally, weekly, and even daily, depending on water additions through precipitation, throughflow, groundwater discharge, and flooding. The volume of the pore space itself can be altered, one way or the other, by several processes. Organic matter content is usually much lower than 5% . Some wetland soils, however, have considerably more organic matter in them (greater than 50% of the solid portion of the soil in some cases).


Microorganisms are the final basic element of soils, and they are found in the soil in very high numbers but make up much less than 1% of the soil volume. A common estimate is that one thimble full of topsoil may hold more than 20,000 microbial organisms. The largest of the these organisms are earthworms and nematodes and the smallest are bacteria, actinomycetes, algae, and fungi. Microorganisms are the primary decomposers of raw organic matter. Decomposers consume organic matter, water, and air to recycle raw organic matter into humus, which is rich in readily available plant nutrients.

So the correct option is 'Mineral Matter-40%,Organic Matter-10%,Soil Moisture -25%, Soil Atmosphere -$25$%,Soil Organism- Variable'.

Multiple choice evs mud and stones soil - formation and profile soil-nature soil profile

Which of the following layer of soil is called as zone of leaching?

  1. $A _0$
  2. $A _{00}$
  3. $A _2$
  4. $A _1$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Leaching is the process by which soluble nutrients are lost from the soil. The A horizon of the soil is the surface layer that consists largely of minerals. The A$ _2$ horizon of this layer shows the maximum leaching. 

So, the correct option is 'A$ _2$'.