اختبار تجريبي (1) لمادة العلوم للصف الثاني متوسط الفصل الدراسي الثاني لعام 1438-1439 ه

Explanation
الجذور تعمل على تثبيت النباتات في التربة.

Explanation
The process of fertilization occurs in the fallopian tube, also known as the oviduct. This is where the sperm and egg meet and the fertilization takes place. The fallopian tube is a narrow tube that connects the ovary to the uterus. After ovulation, the egg is released from the ovary and travels through the fallopian tube. If sperm is present in the fallopian tube, it can fertilize the egg, resulting in pregnancy.

Explanation
خلايا الدم الحمراء هي خلايا تقوم بنقل الأكسجين إلى الأنسجة في الجسم. تنتج هذه الخلايا في نخاع العظم، وتحديدا في العظام الكبيرة مثل الفخذ والعظم القصي.

Explanation
This statement is incorrect. Light is not electrical waves, but it is a form of electromagnetic waves. Light consists of both electric and magnetic fields that oscillate perpendicular to each other and propagate through space.

Explanation
The correct answer is "الوتر" because it is a term used in anatomy to refer to a tendon. Tendons are fibrous tissues that connect muscles to bones, allowing for movement and stability in the body. In this context, "الوتر" is the most relevant option as it is the only term related to connective tissue, while "البشرة" refers to the skin and "الثغور" means throats, which are not related to the given explanation.

Explanation
The correct answer is "درجة الحرارة" (temperature). The question is asking for the measurement that the Celsius scale is used for. The Celsius scale is a temperature scale commonly used in scientific and everyday applications to measure temperature.

Explanation
The explanation for the given correct answer is that cell division can occur in two different ways: equal division (mitosis) and unequal division (meiosis). In mitosis, a cell divides into two identical daughter cells, each with the same number of chromosomes as the parent cell. This type of division is important for growth, repair, and asexual reproduction. On the other hand, meiosis is a type of cell division that produces gametes (sperm and egg cells) with half the number of chromosomes as the parent cell. This allows for genetic diversity and is essential for sexual reproduction.

Explanation
This statement is incorrect. There are multiple types of energy, not just electrical energy. Examples of other types of energy include thermal energy, kinetic energy, potential energy, and chemical energy. Therefore, the correct answer is "خطأ" (false).

Explanation
فيتامين د يلعب دورًا هامًا في صحة الجسم، حيث يساعد في امتصاص الكالسيوم من الأطعمة في القناة الهضمية.

Explanation
The statement is correct as it states that plants vary in sizes, ranging from microscopic plants to giant trees. This is a well-known fact as plants come in various sizes and forms, with some being very small and others growing to be extremely tall and large.