Correct Answer: B. marital status of Queen Victoria

Correct Answer: C. Atlantic ocean

Correct Answer: B. I, II and III

Explanation

Post-planting operations in a cocoa plantation include rogueing, stumping, and mulching. Rogueing involves removing plants that are diseased or not growing properly. Stumping is the process of cutting back the tree to a short stump to encourage new growth. Mulching involves covering the soil around the plants with organic material to conserve moisture, suppress weeds, and improve soil fertility.

Correct Answer: C. it required total rejection of African culture

Correct Answer: C. loss of oxygen

Correct Answer: C. allotropy

Correct Answer: B. price legislation

Correct Answer: D) shark

Explanation

This Biology question is asking which animal is not metamerically segmented. Metamerically segmented means that the animal's body is made up of repeated segments that are similar in structure. The options given are tapeworm, earthworm, centipede, and shark. Tapeworms are flatworms that are parasitic. They have a long, ribbon-like body but do not have segmented bodies, so they are not metamerically segmented. Earthworms, on the other hand, have segmented bodies, which allows them to move efficiently. Each segment has muscles and bristles that help them move through the soil. Centipedes are also metamerically segmented, with each segment having a pair of legs. They are predatory arthropods and use their legs to hunt for prey. Sharks, the correct answer, are not metamerically segmented. Although they have a skeleton made of cartilage and have some repetitive structures, their body is not divided into segments like that of an earthworm or centipede. In conclusion, the animal that is not metamerically segmented is the shark. It is important to understand different body structures of animals as it helps us classify them better.

Correct Answer: C. i, ii, iii and vi

Explanation

(a) \(^{14}_7 + ^1_0n\) -> \(^4_2He + ^{11}_5X\)

(b)(i) The radioactive atom disintegrates spontaneously while a stable atom does not disintegrate on its own.

(ii) The time at which the number of radioactive atoms remaining is just one-half of the original number is called half-life of the element. The half-life T\(_{\frac{1}{2}}\) is related to the decay constant (\(\lambda\)) of the isotope by the equation.

\(T \frac{1}{2} = \frac{0.693}{ \lambda}\)

(iii) After 35days, 1/2 of it remains.

After 70 days, 1/2 of 1/2 i.e. 1/4 remains. After 105 days, % of 1/4 i.e. 1/8 remains.

(c)(i) The photon energy Ep = hf = \(\frac{hc}{f}\)

= \(\frac{6.6 \times 10^{-34} x 3.0 \times 10^8}{ 5.0 x 10^{-7}}\)

= 3.96x 10-19J

(ii) The kinetic energy E\(_k\) = (Ep - W)

E\(_k\) = hf - W = \(\frac{hc - W}{\lambda}\)

W = 1.9eV = 1.6 x 10\(^{19}\) x 1.9

= 3.044 x 10\(^{-19}\)J.

E\(_k\) = 3.96 x 10\(^{-19}\) - 3.044 x 10\(^{19}\) = 9.2 x 10\(^{-20}\)J.

(iii) Stopping potential Vs = energy needed to stop most energetic electron.

eVs =E\(_{kmax}\)

Vs = \(\frac{E_{max}}{e}\)

= \(\frac{9.20 \times 10^{-20}}{1.6 \times 10^{-19}}\)

= 0.575 V