Correct Answer: D. a speech

Explanation

(a) \(P(Ade) = \frac{2}{3} ; P(Kujo) = \frac{5}{8} ; P(Fati) = \frac{3}{4}\)

\(P(\text{all three pass the exam}) = \frac{2}{3} \times \frac{5}{8} \times \frac{3}{4}\)

= \(\frac{5}{16}\)

(b) P(Ade fails) = \(1 - \frac{2}{3} = \frac{1}{3}\)

P(Kujo fails) = \(1 - \frac{5}{8} = \frac{3}{8}\)

P(Fati fails) = \(1 - \frac{3}{4} = \frac{1}{4}\)

P(none passes) = \(\frac{1}{3} \times \frac{3}{8} \times \frac{1}{4}\)

= \(\frac{1}{32}\).

(c) P(Ade and Kujo only pass) = \(\frac{2}{3} \times \frac{5}{8} \times \frac{1}{4}\)

= \(\frac{5}{48}\)

Correct Answer: D. build houses

Correct Answer: C. were deeply troubled and asked what they should do

Correct Answer: B) adrenalin

Explanation

When we experience fright or become agitated, our body responds by releasing a hormone that prepares us to fight or flee from danger. This hormone is called adrenaline, and it is produced by the adrenal glands which are located on top of our kidneys. Adrenaline helps to increase our heart rate, blood pressure and breathing rate, which helps to deliver more oxygen and energy to our muscles so that we are able to respond to the situation quickly. Option B is the correct answer. Insulin, Option A, is a hormone that is produced by the pancreas and helps to regulate our blood sugar levels by allowing glucose to enter our cells. Thyroxine, Option C, is a hormone produced by the thyroid gland that helps to regulate our metabolism. Pitiutrin, Option D, is not a hormone that is produced in the body. Understanding the role of hormones in the body is an important part of learning about Biology. Hormones are chemical messengers that are produced by glands in the body and are involved in many different processes such as growth, development, metabolism and response to stress.

Correct Answer: B) secreted directly into the blood stream

Explanation

Hormones are chemical messengers produced by glands in the body that regulate various bodily functions. The question is asking which statement is correct about hormones. The options are: Option A: Secreted into the blood through ducts Option B: Secreted directly into the bloodstream (Correct) Option C: Inactive chemical substances in the bloodstream Option D: Non-specific in their mode of action The correct answer is Option B, which states that hormones are secreted directly into the bloodstream. This means that hormones are not transported through ducts, but rather are released directly into the bloodstream by endocrine glands. Once in the bloodstream, hormones travel throughout the body to their target cells and organs, where they bind to specific receptors and initiate a response. It is important to note that hormones are highly specific in their mode of action, meaning that each hormone only binds to specific receptors on specific cells or organs. This specificity ensures that hormones only affect the target cells or organs they are intended to regulate, and not other cells or organs in the body. In summary, hormones are secreted directly into the bloodstream by endocrine glands, and are highly specific in their mode of action.

Correct Answer: B. bold

Correct Answer: C) transition metals

Explanation

(a) Two main types of environmental pollution are:

(i) Air pollution

(ii) water pollution

Three causes of water pollution include:

(I) The release of disease-producing (pathogenic) bacteria and viruses (biological pollution diseases

(ii) Undesirable ions and compounds in solution (chemical pollution) into water thereby changing its colour, taste and/or smell

(iii) Oil spillage - the bursting of oil pipes results in oil spillage into water thereby changing the colour, taste and smell of the water.

(b) Three effects of pollution on man are:

(i) Atmospheric pollution, which may be caused by fog reduces visibility. This poses a serious danger to motorists and pilots

(ii) Pollutants may have adverse psychological effects on man and animals e.g discomfort, chronic diseases, such as lung cancer and asthma, impairment of growth and death

(iii) Some pollutants are toxic and can kill plants e.g sulfur dioxide and hydrogen fluoride are toxic to plants from which man gets his food.

Correct Answer: A. A decraese in the total asssets by N5000