Correct Answer: C. a food chain

Correct Answer: A. light energy

Explanation

Proper light in the aquarium serves as a form of energy for the photosynthetic plants and animals, hence is very important.

Correct Answer: C. release of species in porcupine fish

Correct Answer: A) Xylem and phloem

Explanation

In plants, the structures that play roles similar to the arteries and veins of animals are called vascular tissues. The two main types of vascular tissues in plants are xylem and phloem. Xylem is responsible for transporting water and minerals from the roots to the leaves, while phloem transports sugars and other organic compounds from the leaves to other parts of the plant. Therefore, the correct answer to this question is option A, xylem and phloem. These structures are essential for the growth and survival of plants, as they allow for the efficient transport of nutrients and water throughout the plant. It is important to note that the other options provided in the question are not correct. Root hairs are extensions of the root epidermis that increase the surface area for absorption of water and minerals, while lenticels are small pores on the stems and roots of some plants that allow for gas exchange. Roots and stems are also important structures in plants, but they do not function in the same way as the arteries and veins of animals. Understanding the functions and structures of vascular tissues is a fundamental concept in plant biology and is relevant in many areas of study, including agriculture, ecology, and biotechnology.

Correct Answer: D. 32

Explanation

Gametes are germ cells used in sexual reproduction, such as eggs or sperm. They are haploid cells with a chromosome number of n, while somatic (non-reproductive) cells are diploid with a chromosome number of 2n. So, if an organism's gametes have 16 chromosomes each, a somatic cell in that organism will have twice that number of chromosomes

Correct Answer: B. Bank account was debited with N500,000 and capital account was credited with N500,000

Correct Answer: C. cranial nerves

Correct Answer: D. haemolysis

Correct Answer: D) reducing sugar

Explanation

In this question, we are given information about a test carried out on juice extract from fresh maize grain. Fehling's solution was added to the extract and boiled. A red precipitate was formed during the test, which indicates the presence of a particular substance in the extract. We are then given five options to choose from, which are alcohol, protein, non-reducing sugar, starch, and reducing sugar. The correct answer in this case is reducing sugar, which means that the extract contained a type of sugar that can be oxidized by Fehling's solution. Reducing sugars are those that can donate electrons to another chemical, such as Fehling's solution, in a chemical reaction. This causes a change in the color of the solution and the formation of a precipitate, which can be used to detect the presence of reducing sugars in a sample. It is important for students to understand the difference between reducing and non-reducing sugars, as well as the properties and functions of different types of sugars in biology. This knowledge can be useful in many areas, such as food science, biochemistry, and genetics. To learn more about this topic, students can refer to their recommended textbooks or online resources that provide more detailed explanations and examples of sugar tests and their applications.

Correct Answer: B) 3

Explanation

During fertilization, a pollen tube grows from a pollen grain and enters the female ovule. The pollen tube contains two sperm nuclei. One sperm nucleus fertilizes the egg cell to form the zygote, while the other sperm nucleus fuses with the two polar nuclei to form the endosperm. Therefore, there are three nuclei present during fertilization: the two sperm nuclei and the polar nuclei. Therefore, the correct answer to the question is option B: 3. It is important to note that fertilization is a crucial process in sexual reproduction, and it leads to the formation of a zygote that later develops into a new organism. To learn more about this, please read the relevant sections of the recommended textbooks.