Correct Answer: B. 2

Correct Answer: B. distance covered

Correct Answer: A. 6.25%

Explanation

(a) Given any triangle ABC

To prove that < A + < B + < C = 180°

Construction: Produce BC to X and draw CP // BA.

Proof: with the lettering \(a_{1} = a_{2}\) (alternate angles);

\(b_{1} = b_{2}\) (corresponding angles)

\(< BCA + < A + < B = 180° ; < ACB + < A + < B = 180°\)

\(\therefore < A + < B + < C = 180°\)

(b)

From the given triangle and with reference to letterings;

\(\hat{a} + \hat{c} + \hat{c} = \hat{b}\) (exterior opposite angles of a triangle)

\(a + c = e\) (exterior opposite angles of a triangle)

\(a + b = a + a + c + c \implies a + b = 2(a + c)\)

\(2e \text{where e = a + c}\)

i.e \(< CAE + < CBD = 2 < CED\) (Proved)

Correct Answer: D) Gene

Explanation

In Biology, hereditary characters are passed on from one generation to another through genes. Genes are the units of inheritance that carry the hereditary information from parents to offspring. In plants, the carrier of hereditary characters is the gene. The options in the question are: Cell, nucleus, chromosome, chloroplast, and gene. Cells are the basic unit of life, and they contain various organelles such as the nucleus, mitochondria, and chloroplasts. The nucleus is the control center of the cell and contains genetic material in the form of chromosomes. Chromosomes are thread-like structures made up of DNA that carry the genetic information. Chloroplasts are the organelles responsible for photosynthesis in plants. Out of the given options, the correct answer is D, gene. Genes are located on chromosomes and are responsible for the transmission of hereditary characters in plants. Although the nucleus and chromosomes play a crucial role in the transmission of hereditary characters, the actual carrier of the hereditary information is the gene. In conclusion, the carrier of the hereditary characters in plants is the gene, which is located on the chromosomes.

Correct Answer: B) good oxidizing agents

Correct Answer: B. sword

Correct Answer: D. Disruptive selection

Explanation

The situation presents an example of disruptive selection. In disruptive selection, organisms with an intermediate phenotype are selected against. This means that individuals with the intermediate phenotype will decrease in prevalence in the population, while organisms on either end of the phenotype spectrum will increase in prevalence. In this case, the trait being discussed is crab size. The smallest and largest crabs survive, but those with an intermediate (middle-sized) phenotype are eaten.

Correct Answer: A. Unstable prices paid to farmers for their products

Correct Answer: A. zero-party system