The question asks to identify the pigment with a high affinity for oxygen. This requires knowledge of common biological pigments and their primary functions, especially those involved in oxygen transport.
Correct Option: A) Haemoglobin is the primary oxygen-carrying pigment in the blood of vertebrates, including humans. It has a very high affinity for oxygen, allowing it to efficiently bind oxygen in the lungs and release it in tissues where oxygen concentration is lower.
To find the value of "60% of 28% of 250", we need to convert the percentages into fractions or decimals and then multiply them sequentially with the given number. The word "of" in mathematics typically implies multiplication.
First, convert 60% and 28% into their fractional forms.
\[ 60\% = \frac{60}{100} \] \[ 28\% = \frac{28}{100} \]Now, substitute these fractions into the expression and multiply them with 250.
\[ \text{Value} = \frac{60}{100} \times \frac{28}{100} \times 250 \]We can simplify the multiplication step by step.
First, calculate 28% of 250:
\[ \frac{28}{100} \times 250 = \frac{28 \times 250}{100} = \frac{28 \times 25}{10} = \frac{700}{10} = 70 \]Now, calculate 60% of this result (70):
\[ \frac{60}{100} \times 70 = \frac{60 \times 70}{100} = \frac{4200}{100} = 42 \]Alternatively, we can simplify all at once:
\[ \text{Value} = \frac{60}{100} \times \frac{28}{100} \times 250 \]Cancel out common factors:
\[ \text{Value} = \frac{6}{10} \times \frac{28}{100} \times 250 \]Divide 250 by 100:
\[ \text{Value} = \frac{6}{10} \times 28 \times \frac{250}{100} = \frac{6}{10} \times 28 \times 2.5 \]Or, more simply:
\[ \text{Value} = \frac{60}{100} \times \frac{28}{100} \times 250 \] \[ \text{Value} = \frac{3}{5} \times \frac{7}{25} \times 250 \] \[ \text{Value} = \frac{3 \times 7 \times 250}{5 \times 25} \] \[ \text{Value} = \frac{3 \times 7 \times 250}{125} \]Since \(250 / 125 = 2\):
\[ \text{Value} = 3 \times 7 \times 2 \] \[ \text{Value} = 21 \times 2 \] \[ \text{Value} = 42 \]Correct Option: A) 42 is the calculated value.
This problem can be solved by setting up a system of linear equations based on the given information. We need to find the cost of one table. We will define variables for the cost of a chair and a table and then use substitution or elimination to solve for the unknown costs.
Let \(C\) be the cost of one chair and \(T\) be the cost of one table.
From the first statement, "The cost of 10 chairs is equal to that of 4 tables", we can write the equation:
\[ 10C = 4T \]We can simplify this equation by dividing both sides by 2:
\[ 5C = 2T \]From this simplified equation, we can express \(C\) in terms of \(T\):
\[ C = \frac{2T}{5} \quad \text{(Equation 1)} \]From the second statement, "The cost of 15 chairs and 2 tables is equal to Rs 2,000", we can write the equation:
\[ 15C + 2T = 2000 \quad \text{(Equation 2)} \]Now, substitute the expression for \(C\) from Equation 1 into Equation 2:
\[ 15\left(\frac{2T}{5}\right) + 2T = 2000 \]Simplify the equation:
\[ \frac{30T}{5} + 2T = 2000 \]\[ 6T + 2T = 2000 \]\[ 8T = 2000 \]Solve for \(T\):
\[ T = \frac{2000}{8} \]\[ T = 250 \]So, the cost of one table is Rs 250.
Correct Option: D) 250
The question asks to identify the advantages of creating monocultures from a given list of consequences. We need to evaluate each statement to determine if it represents a benefit or a drawback of monoculture practices.
Clearing huge areas of vegetation is generally a negative consequence, as it leads to habitat loss and environmental degradation. It is not an advantage.
Monocultures involve growing a single species over a large area, which inherently reduces the variety of other plant and animal life, thus destroying biodiversity. This is a significant disadvantage.
Monocultures are often established to produce a large quantity of a single crop or tree species that is in high demand by industries (e.g., specific timber, pulp, rubber). This allows industries to procure their required raw materials efficiently and in bulk, which is an economic advantage from an industrial perspective.
When monocultures (especially plantations of commercial species) are managed by forest departments or related agencies, the sale of the harvested products (timber, rubber, etc.) generates income. This revenue can be used for departmental operations, conservation efforts, or contribute to the national economy. This is an economic advantage.
Monocultures focus on one or a few commercial products, often neglecting the diverse needs of local communities who might rely on a variety of forest products (food, fodder, medicine, fuel wood) from a biodiverse ecosystem. This is a social disadvantage.
Based on the analysis, statements c and d describe advantages of monocultures, primarily from an economic and industrial perspective.
Correct Option: C) c and d
To find the distance traveled, we need to convert the given speed and time into consistent units. The speed is given in meters/second, and the time is in hours and minutes. We will convert the speed to kilometers/hour and the time to hours, then use the formula: \(\text{Distance} = \text{Speed} \times \text{Time}\).
Given speed \( = 20 \text{ m/s}\).
To convert meters to kilometers, we divide by 1000. To convert seconds to hours, we divide by \(3600\) (since \(1 \text{ hour} = 60 \text{ minutes} = 60 \times 60 = 3600 \text{ seconds}\)).
\[ \text{Speed in km/h} = 20 \times \frac{3600}{1000} \text{ km/h} \]\[ \text{Speed in km/h} = 20 \times 3.6 \text{ km/h} \]\[ \text{Speed in km/h} = 72 \text{ km/h} \]Given time \( = 2 \text{ hours and } 20 \text{ minutes}\).
We need to convert 20 minutes into hours.
\[ 20 \text{ minutes} = \frac{20}{60} \text{ hours} = \frac{1}{3} \text{ hours} \]\[ \text{Total Time} = 2 + \frac{1}{3} \text{ hours} = \frac{6+1}{3} \text{ hours} = \frac{7}{3} \text{ hours} \]Using the formula \(\text{Distance} = \text{Speed} \times \text{Time}\):
\[ \text{Distance} = 72 \text{ km/h} \times \frac{7}{3} \text{ hours} \]\[ \text{Distance} = \frac{72 \times 7}{3} \text{ km} \]\[ \text{Distance} = 24 \times 7 \text{ km} \]\[ \text{Distance} = 168 \text{ km} \]Correct Option: B) 168
The distance traveled by the car is 168 kilometers.
The question asks about the origin of the ideals of Liberty, Equality, and Fraternity in the Indian Constitution. This requires knowledge of the sources of various provisions adopted by the Constituent Assembly from different world constitutions.
Correct Option: D) The Constitution of France is the source from which the ideals of Liberty, Equality, and Fraternity were imported into the Preamble of the Indian Constitution. These ideals are fundamental to the French Revolution and its legacy.
The problem describes a circular arrangement of six students. We need to deduce their seating positions based on the given clues and then identify the immediate neighbours of Kamal. We will use a step-by-step method to place each student around the circular table.
To determine which reaction would undergo precipitation, we need to analyze the solubility rules for ionic compounds. Precipitation occurs when two soluble ionic compounds react to form an insoluble product (a precipitate).
Correct Option: A) Pb(NO₃)₂ + KI — This reaction produces lead(II) iodide (PbI₂), which is an insoluble compound and will precipitate.
Find the value of
4−5÷47×4−6.
The problem involves simplifying an expression with exponents. We will use the rules of exponents, specifically the product rule \((a^m \times a^n = a^{m+n})\) and the quotient rule \((a^m \div a^n = a^{m-n})\), to combine the terms.
A) \(4^{-18}\) is the correct answer, as derived from applying the rules of exponents sequentially.
The problem requires us to modify a given number based on specific rules for its digits and then find the sum of two particular digits in the modified number. We will first identify each digit as odd or even, apply the given operations (subtract 1 from odd digits, add 1 to even digits), form the new number, and then identify the required digits and sum them up.
A) 10 — As calculated in the step-by-step explanation, the sum of the second digit from the left (3) and the third digit from the right (7) in the modified number is \(3 + 7 = 10\).