Correct Answer: C. even distribution of plants and reduction of intraspecific competition

Explanation

(a)(i) Co-dominance: Co-dominance occurs when both the alleles in an heterozygous individual are fully expressed; that is both alleles exert their effects so that the hybrid has a phenotype; that is different from what the parents exhibit.

(ii) Calculation of individuals with co-dominant blood group:Mention of co-dominant blood group is AB. Evidence of calculation 32.8% of 250 OR 32.8/100 x 250 = 82 individuals/ people.

(iii) Total number of individuals that can donate blood to blood group B: The total number of individuals will be from groups B and 0.

—14% of the population is Blood group B 14% of 250 OR 14/100 x 250 = 35 individuals/people.

— 45.2% of the population is Blood group 0 45.2% of 250 OR 45.2/100 x 250 = 113 individuals/people.

— Total number of people = 113 of group 0+ 35 of group B = 148 Individuals/people can donate blood to the accident victim in B. OR The total number of individuals from (B and 0) blood group B and 0

— 14% + 45.2 = 59.2%.

— 59.2% of 250. 592/100 x 250 = 148 people/individuals.

Explanation

(a)A market refers to any system or arrangement by which persons and institutions are brought into contact to exchange goods and services

(b) The features are

(i) Buyers and sellers are price takers. A price taker is a firm or individual who takes the market price as given.

(ii) Many buyers and sellers. The number of buyers and sellers should be so large that no single buyer or seller can influence the price of the commodity

(iii) Free entry and exit. No barriers like technological or efficient scale of operation, taxes, quotas etc which allow only one firm to produce at the lowest average

total cost.

(iv) Homogeneous product. The goods sold are perfect substitutes.

(v) No preferential treatment to either buyers or sellers in the market.

(vi) Complete information of the market conditions must be available to operators of the market.

(vii) No transport cost

Correct Answer: B. 6.0x10T

Correct Answer: A. Jeroboam

Explanation

The first king of the divided kingdom of Israel was Jeroboam. After the death of King Solomon, the kingdom of Israel was divided into two: the northern kingdom of Israel and the southern kingdom of Judah. Jeroboam became the king of the northern kingdom.

Correct Answer: A. Farmstead

Correct Answer: B) passing it through the mass

Explanation

Hydra is a type of aquatic animal that feeds on small aquatic animals and plants. When it feeds, it takes in food into its body cavity where digestion takes place. After digestion, undigested food needs to be removed from the body. The question is asking how Hydra removes undigested food. Option A suggests that Hydra removes undigested food by passing it through the anus, which is incorrect. Hydra does not have an anus, which is an opening at the end of the digestive tract through which solid waste is eliminated from the body. Option B suggests that Hydra removes undigested food by passing it through the mass, which is the correct answer. Hydra does not have a specialized structure for waste elimination. Instead, it eliminates undigested food by passing it out through the same opening through which it took in food. This opening is called the mouth or the mass. Option C suggests that Hydra removes undigested food by means of a contractile vacuole, which is incorrect. Contractile vacuoles are organelles found in some unicellular organisms that pump excess water out of the cell. Option D suggests that Hydra removes undigested food by egering it through the body surface, which is incorrect. Hydra does not have a specialized structure for waste elimination through the body surface. Option E suggests that Hydra removes undigested food by passing it through the nose, which is incorrect. Hydra does not have a nose or any structure that can be called a nose. In summary, the correct answer to the question is option B, Hydra removes undigested food by passing it through the mouth or the mass.

Correct Answer: D. escaping detection

Correct Answer: B. the moon comes exactly between the earth and the sun

Explanation

The moon has no light and so depends on the sun.

The same goes for the earth, when the moon comes in between the sun and earth, it block the light coming from the sun directly to earth, hence lunar eclipse occur.

Correct Answer: B. (x + 5)(x + 4)