Correct Answer: B. 12

Explanation

Let the interior angle = x^o

interior angle = 5x^o (sum of int. angle ann exterior)

(angles = angle or straight line)

6x = 180

x = \(\frac{180}{6}\)

x = 30^o

no. of sides = \(\frac{\text{sum of exterior angles}}{\text{exterior angle}}\)

= \(\frac{360}{30}\) = 12

Correct Answer: D. an acid anhydride

Explanation

The compound that could be dried by using conc. tetraoxosulphate (VI) acid and not calcium oxide is an acid anhydride. Acid anhydrides are compounds that can react with water to form acids. When acid anhydrides are exposed to air, they will absorb water from the air and become hydrated. This can make them difficult to dry with calcium oxide, which is a base.

Correct Answer: C. Our enemies

Explanation

In the Gospel of Mark, Jesus specifically mentions that we should love our enemies. This is found in Mark 12:30-31, where Jesus states the greatest commandment is to love God with all our heart, soul, mind, and strength, and the second is to love our neighbor as ourselves. In the context of the New Testament, 'neighbor' includes enemies.

Correct Answer: A. dictatorship

Explanation

The disadvantage of a one party system is that there is no check on the power of the Party. This inevitably leads to corruption and abuses of power. What's more, a one-party state cannot be maintained without secret police, repression, and suppression of the free flow of information. This can lead to a dictatorship, which is a form of government in which one person or a small group possesses absolute power without effective constitutional limitations.

Correct Answer: D. 1800°

Explanation

number of sides = \(\frac{360^o}{\theta} = \frac{360^o}{306o}\)

n = 12^o

Sum of interior angle = (n - 2) 180^o

(12 - 2) 180v = 10 x 180^o

= 1800^o

Correct Answer: B. the people

Explanation

(a)(i) Expected total volume of soil and water = 50cm³ + 50cm³ = 100cm³

Actual or given total volume of air and water = 74cm³

Difference in total volume = 100cm³ — 74cm³

The difference represents air space volume = 26cm³

(ii) Porosity of the soil sample = volume of air space in the soil divide volume of soil sample x 100%

26cm³/50cm³ x 100/1 = 260/5 = 52 %

(b) Reasons why soil porosity is important in agriculture: It influences: (i) exchange of gases by the roots/soil aeration (ii) the water retention capacity of soil (iii) nutrient availability in soil (iv) the microbial activities in the soil (v) the pH level of soil (vi) and enhances root penetration in the soil.

(c) Characteristics of: (i) Igneous rocks (a) glassy appearance (b) crystalline appearance (c) light and dark in colour (d) hard or very hard to touch (e) compact

(ii) Sedimentary rocks: (a) appear in layers, sheets or strata (b) coarse textured (c) animal/plant remains may be present (fossils) (d) soft (e) reacts with weak acids e.g. dilute HCL, Carbonic acid does not dissolve in water.

Correct Answer: A. Public Accounts Committee

Correct Answer: A. Benzene

Correct Answer: A) guard cells

Explanation

Stomata are tiny openings on the surface of plant leaves that allow for gas exchange. The opening and closing of stomata is an important process that helps plants regulate water loss and uptake, as well as the exchange of gases like carbon dioxide and oxygen. The question is asking about the mechanism that controls the opening and closing of stomata. The correct option is A, guard cells. Guard cells are specialized plant cells that surround each stomatal pore and control its opening and closing. When the guard cells are turgid, or swollen with water, they bow out and create an opening for gas exchange. When the guard cells are flaccid, or limp, they close the stomatal pore to prevent water loss. The mechanism for opening and closing the stomata is complex and involves a number of different factors, including the concentration of ions like potassium and chloride within the guard cells, the movement of water in and out of the cells, and the presence of hormones like abscisic acid. By adjusting these factors, plants are able to open and close their stomata in response to changes in environmental conditions like temperature, humidity, and light. Overall, understanding the mechanism of stomatal opening and closing is an important part of understanding how plants function and how they respond to their environment. It allows us to better appreciate the complex interactions between plants and their surroundings, and to develop new strategies for improving crop yields and conserving water resources