Transcription
In today's video, we will present the Class VII Second Unit Test, i.e., the Second Periodic Evaluation 2025 Environment and Science question paper with answers in a completely error-free manner, and you are likely to get many questions from here in the exam. Anyway, now we will come to question number one. Choose and write the correct answer. Any five. The first question is, which is the luminous object among the given ones: Sun, burning bulb, or Moon? The correct answer will be Moon, and the luminous objects are the Sun and the burning bulb. Remember this. The next question is, which is the good conductor of electricity? The correct answer will be copper. The next question is, the filament of an electric bulb is made of? The correct answer will be tungsten metal. The next question is, which is not an eco-friendly energy? The correct answer will be energy obtained from oil from fossils. Okay? The next question is, in a pinhole camera, the image of the object is formed? The correct answer will be an image is formed. The next question is, windmills are seen in West Bengal. The correct answer will be in Bakkhali. The next question is, what is used in an electric calling bell? The correct answer will be an electromagnet. Now we come to question number two. The marks for each question are one. First question: What is a magnetic field? A very important question. Answer: The space around a magnet where the magnet's attractive or repulsive force acts is called the magnetic field of that magnet. The next question is, what are the full names of LED and LPG? In the answer, write the full name of LED is Light Emitting Diode. And the full name of LPG is Liquefied Petroleum Gas. The next question is, what is a circuit? This question is also important. Answer: The continuous path along which electricity travels or flows is called an electric circuit or simply a circuit. The next question is, write two uses of solar energy. In the answer, you will write the uses of solar energy: 1. Solar energy is used in solar calculators. 2. Solar energy is used to light solar street lights. The next question is, what is the main component of biogas? This question is also important. The answer will be methane. Now we will come to fill in the blanks. You have to do any four. The marks for each question are one. First question. Electric eels have an electricity-generating system in their bodies. The blank will be filled with Electric eel. Okay? The next question is, the scientist who discovered the dispersion of light was _____. The blank will be filled with Newton. Look at the next question. The _____ phenomenon of light is responsible for the formation of a rainbow. The blank will be filled with dispersion. The next question is, the coil of an electric heater is made of _____ wire. The blank will be filled with nichrome wire. The next question is, there is a chemical substance inside the cell of a torch. This cell is called _____. The blank will be filled with primary cell. Okay? Now we will come to question number three. The marks for each question are two. First question: Write the difference between regular reflection and diffused reflection. A very important question. So, you will write the answer. On the left side, write Regular Reflection. In regular reflection, the reflected rays are parallel to each other. In diffused reflection, the reflected rays are not parallel to each other. Then write, an image is formed in regular reflection. Then write, an image is not formed in diffused reflection. Now we will go to the next question. What is meant by refraction of light? In the answer, you will write: When a ray of light enters from one transparent medium to another transparent medium obliquely, the direction of the ray of light changes at the boundary of the two media. This phenomenon is called refraction of light. The next question is, what is a spectrum? A very important question. The next question is, what is a fuse wire and write its uses. This is also quite important. The next question is, what is a dry cell? You should try to answer these questions yourself. Now we will go to question number four. The marks for each question are three. First question: What is an electromagnet? How can the strength of an electromagnet be increased? Write two of its uses. This question is very important. So, in the answer, write: When a magnetic material is converted into a magnet by electric current, that magnet is called an electromagnet. Then write, the strength of an electromagnet can be increased in the following ways. For example: 1. By increasing the number of turns of wire per unit length. 2. By increasing the current intensity. Then write the uses of electromagnets. 1. Electromagnets are used in electric motors and electric calling bells. 2. Doctors use powerful electromagnets to remove iron filings that have entered the eye. Now we will go to the next question. What is eco-friendly energy? Write three uses of thermal energy. A very important question. Answer: Energy sources whose use causes relatively less harm to the environment are called eco-friendly energy. Then write the uses of thermal energy. 1. To generate thermal power. 2. To run steam engines. 3. Thermal energy is used for firing bricks. We will go to the next question. Write the two laws of reflection of light with diagrams. This question is also very important. The next question: Explain with evidence that the Earth itself is a magnet. Now we will go to Group B, i.e., from Life Science. First question: The place from which a branch or leaf emerges from the stem is called the node. Internode, or shoot? The correct answer will be node. The next question: The microorganism that lives in the roots of the pea plant is _____. The correct answer will be Rhizobium. The next question: The part of the flower that develops into a fruit is _____. The correct answer will be ovary. The next question: A compound fruit is _____. The correct answer will be cashew. We will go to question number two. The marks for each question are one. First question: Write the name of a leaf that stores food. The answer will be Aloe Vera. The next question: What is the root cap region? A very important question. Answer: The cap-like part at the tip of the main root and its branches is called the root cap. The region where the root cap is located is called the root cap region. The next question: What is the full name of ORS? This question is also important. Answer: The full name of ORS is Oral Rehydration Solution. Question number four: What is pheromone? This question is also quite important. Answer: Pheromone is a volatile chemical substance secreted by an animal's body that mixes with the air and helps in communication among animals of the same species. The next question: What is the cap-like part at the tip of the root called? Answer: It is called the root cap. Look at the next question. Which part of the mango do we eat? Answer: Mesocarp. Now we will go to question number three. The marks for each question are three. First question: Explain how marine fish maintain the normal amount of water in their bodies. This question is very important. So, in the answer, you will write: Marine fish maintain the normal amount of water in their bodies in the following ways: 1. Marine fish excrete concentrated urine. As a result, very little water is lost from the body. 2. They excrete excess ions from the body through their gills. Now we will go to the next question. Write the differences between self-pollination and cross-pollination. This question is also very important. So, in the answer, you will write: In self-pollination, write: When the pollen of a flower is transferred to the stigma of the same flower or another flower on the same plant, this phenomenon is called self-pollination. In cross-pollination, write: When the pollen of a flower is transferred to the stigma of a flower of a different plant of the same species, this phenomenon is called cross-pollination. Then write: Can occur without a pollinator. Then in cross-pollination, write: Requires a pollinator. Make point number three: In self-pollination, plants with new characteristics are not created. In cross-pollination, write: Plants with new characteristics are created. We are going to the next question. Write two functions each of stem and leaf. This question is very important. Look at the next question. What is meant by epigeal and hypogeal germination? This question is also very important. Look at the next question. Write two differences between diffusion and osmosis. The next question: Draw a diagram of an ideal flower or an ideal root and label the different parts. This question is very important. So, the diagram of an ideal flower among these is very important. Keep an eye on it carefully, or draw a diagram of an ideal leaf, such as a hibiscus leaf, and label the different parts. This question is moderately important. So, friends, this was your Class VII Environment and Science Second Unit Test suggestion. Prepare this suggestion quickly. I hope you will get many questions from here in the exam. So, with that, I am ending today's video here. Stay well, everyone. Thanks for watching this video.