Correct Answer: B. Tt, tt

Correct Answer: B) Tapeworm

Explanation

This question is asking us to identify the organism that is not a micro-organism. Micro-organisms are tiny living things that can only be seen with a microscope. The options given are Virus, Tapeworm, Coccus, and Vibro cholera. Out of these options, the correct answer is Tapeworm. Tapeworms are not micro-organisms because they are relatively large parasites that can be seen with the naked eye. They live in the digestive tracts of animals, including humans, and can cause health problems. On the other hand, viruses, cocci, and Vibro cholera are micro-organisms. Viruses are tiny infectious agents that can only replicate inside living cells. Cocci are spherical bacteria that can cause diseases such as strep throat and pneumonia. Vibro cholera is a type of bacterium that causes cholera, a serious and sometimes deadly disease. In summary, Tapeworm is not a micro-organism while Virus, Coccus, and Vibro cholera are micro-organisms. It is essential to understand the characteristics and types of micro-organisms to identify and classify them correctly.

Correct Answer: C. The gene for the spotted coat is dominant over the gene for the black coat

Correct Answer: A. nitrogen

Correct Answer: A. possess transmittable characters

Correct Answer: B. radial symmetry

Correct Answer: C. whorl, arch, compound and loop

Correct Answer: B. 1/2

Explanation

In humans, the sex of a child is determined by the combination of sex chromosomes received from the parents. The mother contributes an X chromosome, and the father contributes either an X chromosome (resulting in a female child) or a Y chromosome (resulting in a male child). Since the father can contribute either an X or a Y chromosome, there are two possible outcomes for the sex of the child: male (XY) or female (XX). The chance of having a male child (XY) is equal to the chance of having a female child (XX). Therefore, the probability of having a male child is 1 out of 2, which is represented as 1/2.

Correct Answer: C. All organisms in a food chain are animals

Correct Answer: B) ecological succession

Explanation

Ecological succession is the orderly changes that occur slowly and naturally in plant and animal communities in a given area over a period of time until a stable community is established. This process involves changes in the composition and structure of the community over time, as different species colonize and are replaced by others. Ecological succession can occur in both primary and secondary succession. Primary succession happens in areas where there was previously no life, such as a newly formed volcanic island or a retreating glacier. Secondary succession occurs in areas where there was previously life, but the community has been disturbed or destroyed, such as after a forest fire or a clear-cutting of a forest. During ecological succession, different species have different roles in the community. Pioneer species, such as lichens and mosses, are the first to colonize an area and create soil, which allows other species to grow. Intermediate species, such as shrubs and small trees, then establish themselves and shade out the pioneer species. Finally, climax species, such as large trees, become dominant and create a stable community. Understanding ecological succession is important for understanding how ecosystems change over time and how they respond to disturbances. It also helps scientists understand how to restore damaged ecosystems and manage them sustainably.