Correct Answer: A. non-partisan

Correct Answer: A. Use of chemicals

Correct Answer: C. II & III only

Explanation

(a) Sexual reproduction in Rhizopus - By conjugation;

• It is usually between two strains of hyphae
• Known as + and - plus and minus/ opposite mating types
• The hyphae come in contact
• And produce small projections of their walls
• Which develop into progametangia with several nuclei
• The two progametangia enlarge
• Each progametangium develops a cross wall to divide into two parts; the gametangium and suspensor
• Subsequently the wall dissolves/breaks; and their contents/nuclei fuse to form a zygote
• The zygote develops a thick wall to form a resistant zygospore
• The zygospore germinates during favourable / damp / wet condition
• Into hyphae which bear sporangia.

(b) (i) Name of hormone Adrenalin /Adrenaline

(ii) Part where hormone is produced Adrenal gland/Medulla.

(iii) Changes that must have taken place as a result of the hormone

• Increase in heart beat
• Increase in rate of respiration
• Arterioles of skin and alimentary canal constrict
• Dilation of blood vessels that cause more blood to flow to the muscles/heart/lungs
• Increase in muscular tone/voluntary muscles become tensed
• Glycogen is converted to glucose/increase in blood sugar level
• To produce more energy
• Dilation of pupils of the eye
• Momentary freight/fear/anxiety/heavy breathing
• Spleen releases more Red Blood Cells from its reserve
• Increase in blood pressure

(c) (i) Differences between excretion in flowering plants and excretion in humans.

(ii) Organelles in plant cells responsible for excretion of metabolic wastes.

Mitochondrion/ mitochondria; chloroplast/ chloroplasts.

Correct Answer: A) Carbohydrates

Explanation

In Biology, organisms need food to survive. Sometimes, there may be a shortage of food. To overcome this, organisms store food substances to use during times of scarcity. The question is asking which food substances are stored in readiness for times of food shortages. The options given are carbohydrates, fats and oils, proteins, and vitamins. The correct answer is option A, which is carbohydrates. Carbohydrates are stored in the body in the form of glycogen, which is a complex carbohydrate made up of many glucose molecules. Glycogen is stored in the liver and muscles and can be broken down into glucose to provide energy for the body when there is a shortage of food. While fats and oils can also be stored in the body, they are not stored specifically for times of food shortages. Proteins are not an ideal energy source because they are primarily used for growth and repair of tissues. Vitamins are essential nutrients that the body needs to function, but they are not stored in large amounts for times of food shortages. It is important to note that while carbohydrates are the main energy source stored for times of food shortages, fats and oils can also be broken down into energy when needed. In conclusion, the food substances that are stored in readiness for times of food shortages are carbohydrates, specifically in the form of glycogen.

Correct Answer: D. \(\frac{1}{81}\)

Correct Answer: A. warrant

Explanation

Warrant is the only authority through which money is expended in government.

Correct Answer: B. fight

Explanation

Robin intends to stop the duel between Demetrius and Lysander.

Correct Answer: B. Saul

Explanation

(a) A magnetic field is a region in which a force of magnetic origin is experienced. It is usually due to the presence of magnetic flux which is a vector quantity.

(b)

A straight wire carrying current is filled through a hole in a cardboard as shown. Compasses are placed round the conductor or the cardboard. The needles of the compass will be noticed to deflect in a particular direction. They all conform to a circular pattern indicating that the magnetic field around the conductor carrying current is circular or concentric in shape. When the current is reversed, the direction of the compass needle reverses as well.

(c)

(d) Current in the same direction

The material is surrounded by a ring of iron. This shields the flux of the earth away from the material.