Correct Answer: D) food web

Explanation

This Biology question is asking about a form or pattern of feeding relationships. The question wants us to identify the correct term that describes this interlocking pattern. The options given are food chain, nutrition, consumer, and food web. The interlocking pattern of feeding relationships is called a food web. A food web is a more complex way of showing feeding relationships than a food chain. It consists of many interconnected food chains that show how different organisms in an ecosystem are connected through their feeding habits. For example, a food web may show how a grasshopper eats plants, how a bird eats the grasshopper, and how a fox eats the bird. This way, we can see how different organisms are linked and how energy flows through the ecosystem. Therefore, the correct answer to this question is option D, food web. Option A, food chain, is a related term, but it does not describe the interlocking pattern of feeding relationships as comprehensively as a food web. Options B and C, nutrition and consumer respectively, are not related to the question being asked. In summary, a food web is the correct term that describes the interlocking pattern of feeding relationships in an ecosystem. To learn more about this, please read the relevant sections of the recommended textbooks.

Explanation

(a)(i) Structural Isomers of C\(_4\)H\(_4\)

(ii) (I)Tertiary(3°)alkanol.

(II) Primary (1°)alkanol.

(III) Secondary (2°) alkanol

(b)(i)

(I) CH\(_3\)CH\(_2\)COOK, H\(_2\)

(II) CH\(_3\)CH\(_2\)COOC\(_4\)H\(_9\) H\(_2\)O

(III) CH\(_3\)CH\(_2\)CH\(_2\)COOH

(ii) Major products in (b)(i) (1) — Potassuim propanoate (II) — Butyl propanoate (III) — Butanoic acid

(C)(i) % carbon by mass = 100 – 14.3 (l) = 85.7%

Ratio of atoms = \(\frac{C}{\frac{85.7}{12.0}}\) = 7.1415; \(\frac{H}{\frac{14.3}{1.0}}\) = 14.3

Divide by smaller number = \(\frac{7.1415}{7.1415}\) = 1; \(\frac{14.3015}{7.1415}\) = 2

Empirical Formular = CH\(_2\)

(i) 2.24dm\(^3\) = 7.0g of R

22.4dm\(^3\) = \(\frac{7.0}{2.24}\) x 22.4 = 70gmol\(^1\)

OR

Molar volume of gas = 22.4 dm\(^3\) at s.t.p 22.4

22.4 dm\(^3\) gas = 1 mole

22.4 dm\(^3\) = \(\frac{2.24}{22.4} \times 1\) = 0.1 mol

But numbers of moles = 0.1

Mr = \(\frac{7}{0.1}\) = 70gmol\(^1\)

Molecular formular = C\(_5\)H\(_{10}\)

(CH_2)n = 70

14n = 70

n = \(\frac{70}{4}\) = 5

(d) The occurence of / existence of / condition whereby compounds with the same molecular formula have different structural formulae.

Correct Answer: B. trade

Correct Answer: A. 4\(\sqrt{3}\)

Correct Answer: D. Peter

Correct Answer: D. microwave

Correct Answer: B. are

Correct Answer: C. has the disease

Explanation

\(Mean = \frac{\sum fx}{\sum f} = \frac{3350}{70} = 47.8571\)

\(\approxeq 47.9\) (to 3 sig. figs)

(b)(i) Mode = 45 (score with the highest frequency)

(ii) Range = Highest mark - Lowest mark

= 75 - 15 = 60.

Correct Answer: C) 3.0