1. Which of following statements on elements on earth is correct? a. New element

Question

1. Which of following statements on elements on earth is correct? a. New elements may be created in chemical reactions b. All elements must exist in compound status c. An atom is the smallest unit of an element that retains its chemical properties d. Total element types are unlimited

2. Which of the following statements best corresponds to natural selection? a. Natural selection allows the largest individuals in a population to survive b. Natural selection is the process that is a main driving force in the evolution of new species c. Natural selection introduces variances in a population d. none of the above correctly correspond to natural selection

3. Which of the following statements on an ecosystem is correct? a. Producers usually obtain their energy from sunlight b. Consumers and recyclers are ultimately obtaining their energy from sunlight harvested by producers c. Recyclers convert producers and consumers into simple forms of matter d. All of the above statements are correct

Explanation / Answer

1. Which of following statements on elements on earth is correct?

Answer: c. An atom is the smallest unit of an element that retains its chemical properties.

Explanation: In a chemical reaction, a new compound or substance is made. To make a new element, the nuclear properties or content must change therefore a new element may be created in a nuclear reaction. An element can exist in a compound state, i.e., in combination with a group of one or more elements or in its natural elemental state.

2. Which of the following statements best corresponds to natural selection?

Answer: d. none of the above correctly correspond to the natural selection.

Explanation: Natural selection is defined as a process of selecting those heritable traits that helps in increasing the chances of survival and reproduction of an organism. Both the options (b) and (c) are correct but these are the applications of natural selection. Due to natural selection, the less adapted population became eliminated and the best-adapted population acquires heritable changes, selected by nature and survived. Natural selection is the key mechanism of evolution along with the genetic drift, migration, mutation, etc. It also introduces variances in a population. Variances in genotype are affected by the variances produced in phenotypes due to environmental factors.

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