NCERT Solutions Class 7 Science Curiosity Chapter 10 Life Processes in Plants

Class 7 Science Curiosity Chapter 10 Very Short Answer Type Questions

Question. What is photosynthesis?
Answer: This is the way green plants create their own food. They use light from the sun, water, carbon dioxide gas, and a green substance named chlorophyll.
In simple words: Photosynthesis is how plants use sunlight and water to make their own food.

Exam Tip: Be sure to name all four key ingredients: sunlight, water, carbon dioxide, and chlorophyll.

Question. Which part of the plant performs photosynthesis?
Answer: Leaves are the main places where plants make their food. Some other green parts can also do this, but the leaves do most of the work.
In simple words: Most of a plant's food is made inside its green leaves.

Exam Tip: Always write "leaves" as the primary site of food-making in plants.

Question. What are stomata?
Answer: Stomata are very small holes found on leaves. These tiny openings allow gases like carbon dioxide and oxygen to move in and out of the plant.
In simple words: Stomata are tiny breathing holes on leaves that let gases in and out.

Exam Tip: Describe stomata as tiny pores or openings and mention that they help in exchanging gases.

Question. Which gas is released during photosynthesis?
Answer: Oxygen is the gas that plants give off during this process.
In simple words: Plants release oxygen gas when they make food.

Exam Tip: Do not confuse oxygen (released) with carbon dioxide (taken in) during photosynthesis.

Question. What are the two transport tissues in plants?
Answer: The two tissues that carry materials in plants are xylem and phloem.
In simple words: Xylem and phloem are like tiny pipes that move water and food inside plants.

Exam Tip: Remember that xylem carries water and minerals, while phloem carries prepared food.

Class 7 Science Curiosity Chapter 10 Short Answer Type Questions

Question. What role does chlorophyll play in photosynthesis?
Answer: Chlorophyll traps the light energy from the sun. This energy is then used to turn water and carbon dioxide into oxygen and glucose, which is the plant's food.
In simple words: Chlorophyll catches sunlight so the plant can use its energy to make food.

Exam Tip: Mention both functions: trapping solar energy and using it to produce glucose from raw materials.

Question. Why is the iodine test done in leaves?
Answer: This test is carried out to see if starch is present in the leaves. Finding starch proves that the leaf has successfully made food through photosynthesis.
In simple words: The iodine test shows if a leaf has made starch, which means it made food.

Exam Tip: Clearly state that the blue-black color change with iodine indicates the presence of starch, proving photosynthesis took place.

Question. What does the phloem transport in plants?
Answer: Phloem carries the food made by the leaves to all other areas of the plant. This includes sending nourishment down to the roots and up to growing fruits.
In simple words: Phloem moves the food made in leaves to every part of the plant that needs it.

Exam Tip: Remember the sound trick: Phloem transports food, while Xylem transports water.

Question. What is the function of the xylem?
Answer: The job of xylem is to carry water and key minerals upward. It moves them from the soil, through the roots, and up into the stems and leaves.
In simple words: Xylem is the tissue that carries water and minerals up from the roots to the leaves.

Exam Tip: Always specify that xylem transport is unidirectional (upwards) and carries both water and dissolved minerals.

Question. Why is carbon dioxide important for photosynthesis?
Answer: Carbon dioxide acts as a key building block that plants need to make their food. Without this gas, the plant cannot complete the food-making process.
In simple words: Carbon dioxide is a main ingredient that plants must have to build glucose.

Exam Tip: Define carbon dioxide as an essential "raw material" or "reactant" for glucose synthesis.

Class 7 Science Curiosity Chapter 10 Descriptive Answer Type Questions

Question. How do plants use the glucose produced during photosynthesis?
Answer: Plants use glucose to get instant energy for growing and staying healthy. Any leftover glucose is turned into starch. The plant stores this starch in its roots, leaves, stems, and fruits to use when needed.
In simple words: Plants burn glucose for quick energy and save the extra as starch for a rainy day.

Exam Tip: Make sure to explain both uses: direct energy consumption and storage in the form of starch.

Question. Explain the process of water transport in plants.
Answer: Roots take in water and mineral nutrients from the soil. These substances then travel up to the leaves through the xylem vessels. This steady flow of water is necessary for making food and keeps the plant upright and firm.
In simple words: Roots drink water from the soil, and xylem tubes carry it up to help the plant stay strong and make food.

Exam Tip: Mention root absorption, xylem as the pathway, and the role of water in maintaining cell turgidity (structure).

Question. Describe an activity to show the release of oxygen during photosynthesis.
Answer: Place an aquatic plant inside a beaker filled with water, and cover it with an upside-down funnel and test tube. When you leave this setup in bright sunlight, you will notice gas bubbles rising and collecting at the top of the tube. These bubbles show that the plant is releasing oxygen.
In simple words: Put a water plant in a glass under the sun, and you will see bubbles of oxygen rise up.

Exam Tip: Describe the setup clearly, noting that the plant must be aquatic (like Hydrilla) and must be kept in sunlight to produce bubbles.

Question. What happens when a plant is kept in the dark for 36 hours?
Answer: If a plant is left in a dark room for a day and a half, it cannot make food because there is no sunlight. The plant will use up all its saved food reserves. Because of this, an iodine test on its leaves will not turn blue-black, showing that no starch is left.
In simple words: Without light, a plant uses up its stored food, leaving its leaves with no starch at all.

Exam Tip: Use the term "destarched" to describe a plant that has used up its starch reserves due to a lack of sunlight.

Question. How does temperature affect photosynthesis?
Answer: Photosynthesis depends heavily on the temperature of the surroundings. If it is too cold or extremely hot, the process will slow down or even stop. Moderate and warm conditions are best for helping the plant make food quickly and efficiently.
In simple words: Plants make food best in comfortable, moderate temperatures. Extreme cold or heat slows them down.

Exam Tip: State clearly how very low, very high, and moderate temperatures each affect the rate of food-making.

Class 7 Science Curiosity Chapter 10 Exploring Questions

Question. Why is photosynthesis essential for all living beings?
Answer: This process is vital because it creates the food and oxygen that support nearly all life. It acts as the very starting point of every food chain. Without plants making food, animals and humans would have nothing to eat and no oxygen to breathe, making survival impossible.
In simple words: Photosynthesis gives us the air we breathe and the food we eat, which keeps all living things alive.

Exam Tip: Emphasize two main points: the release of life-supporting oxygen and the creation of food that forms the foundation of all food webs.

Question. How does the design of leaves help in photosynthesis?
Answer: The wide and flat shape of leaves allows them to catch as much sunlight as possible. Inside, they contain lots of green chloroplasts to capture energy and tiny pores called stomata to swap gases easily. These features work together to make the food-making process highly efficient.
In simple words: Broad, flat leaves are perfect for catching sunlight and breathing in gases to make food.

Exam Tip: Mention three structural features of leaves: their broad/flat surface, stomata for gas exchange, and chloroplasts for catching light.

Question. What would happen if all photosynthetic organisms disappeared?
Answer: If plants and other green organisms went away, our planet would run out of oxygen and food. Since there would be no primary food producers left, almost all living creatures would perish, destroying the natural balance of our environment.
In simple words: If all green plants died, there would be no food or oxygen left, and life on Earth would end.

Exam Tip: Focus your answer on the total loss of the oxygen supply and the complete collapse of the food web.

Question. How do plants balance oxygen and carbon dioxide in the environment?
Answer: When making food, plants take in carbon dioxide and give out oxygen. But when they breathe during respiration, they do the opposite by taking in oxygen and giving out carbon dioxide. This continuous cycle keeps both gases perfectly balanced in the air.
In simple words: Plants take in carbon dioxide and release oxygen to make food, but they breathe in oxygen and release carbon dioxide just like us. This dual action keeps the air balanced.

Exam Tip: Explain both processes (photosynthesis and respiration) and how their opposite gas exchanges maintain atmospheric balance.

Question. Why is respiration in plants important despite photosynthesis?
Answer: While photosynthesis is used to build food, plants must break down that food to get usable energy. Respiration is the process that unlocks this energy from glucose, allowing the plant to grow, divide its cells, and perform daily activities.
In simple words: Photosynthesis makes the food, but respiration is how the plant actually uses that food to get energy.

Exam Tip: Clearly differentiate between making food (photosynthesis) and releasing energy from food (respiration).

Question. What is photosynthesis and why is it important as explained in Class 7 Science Curiosity Chapter 10?
Answer: According to the chapter, green plants perform a vital process to make nourishment using water, light, carbon dioxide, and chlorophyll. This mostly occurs within the leaves, creating oxygen along with a simple sugar called glucose. This process is incredibly important for all living organisms because it yields the oxygen we need to breathe and serves as the starting point of the global food web. Earthly life would fail to exist without it, and it keeps the levels of carbon dioxide and oxygen in the air steady.
In simple words: Plants make their own food and release oxygen using sunlight and water. This keeps the air clean and provides food for everyone.

Exam Tip: For longer descriptive questions, break down your answer into two parts: definition of the process first, and then its ecological importance.

Question. How does water travel in plants as per Class 7 Science Curiosity Chapter 10?
Answer: As explained in the chapter, roots pull water and dissolved minerals out of the ground. These are then carried up into the stem and leaves using specialized tubes called xylem. Moving water upwards is necessary to keep the plant cool, give it support, and assist with making food. Once the water gets to the leaves, the plant uses it alongside sunlight and carbon dioxide to synthesize nutrients. Plants would fail to grow or stay alive without this internal transportation network.
In simple words: Water goes from the soil into the roots and travels up through xylem tubes to the leaves so the plant can grow and stay cool.

Exam Tip: Remember to name xylem as the tissue responsible for water transport and explain that this flow is necessary for photosynthesis and structural support.

Question. Why are stomata important in plants as discussed in Class 7 Science Curiosity Chapter 10?
Answer: The chapter describes stomata as microscopic pores located mostly on the lower surface of leaves. These openings are critical for letting gases pass in and out. While making food, stomata let carbon dioxide enter the leaf and let oxygen escape. They also assist in transpiration, which is how water vapor evaporates from the plant. Transpiration is useful because it cools the plant down and pulls more water up from the roots. Since these pores can open and close based on what the plant needs, they are absolutely necessary for its life.
In simple words: Stomata are tiny leaf doors that let gases in and out and help release extra water to keep the plant cool.

Exam Tip: Be ready to explain two main roles of stomata: facilitating gas exchange for photosynthesis/respiration and regulating water loss via transpiration.

Question. What is the most important thing to understand in Class 7 Science Curiosity Chapter 10?
Answer: The central idea of this chapter is the process of photosynthesis. This explains how green plants utilize sunlight, water, carbon dioxide, and chlorophyll to create food. Photosynthesis supports the whole ecosystem and maintains the level of oxygen in our atmosphere. Additionally, you should focus on how xylem and phloem act as transport tissues to move essential food and water through the plant.
In simple words: The most crucial parts to learn are how plants make food using sunlight and how they transport water and food inside their bodies.

Exam Tip: Focus your revision on the overall chemical process of photosynthesis and the distinct roles of xylem and phloem tissues.

Question. Is Class 7 Science Curiosity Chapter 10 full of tough words and terms?
Answer: This chapter introduces several new scientific terms like photosynthesis, stomata, transpiration, xylem, and phloem. While these words might seem difficult at first, they represent simple and exciting processes that occur inside plants. Once you understand how plants breathe, make food, and transport nutrients, these terms become very easy to remember.
In simple words: There are some new scientific words to learn, but they are easy to understand once you know how a plant works.

Exam Tip: Create a glossary of key terms in your notebook to make revising terms like xylem, phloem, and stomata much easier.

Question. How can I remember the steps of photosynthesis from Chapter 10 easily?
Answer: You can easily remember photosynthesis by breaking it down into a simple word equation: Carbon dioxide + Water (with Sunlight and Chlorophyll) produces Glucose + Oxygen. Think of plants as little kitchens that use sunlight as stove heat, chlorophyll as the chef, water and carbon dioxide as ingredients, and glucose as the finished dish.
In simple words: Remember it like a recipe: plants mix water and carbon dioxide with the help of sunlight and chlorophyll to make glucose food and release oxygen.

Exam Tip: Practicing the word equation for photosynthesis is the best and quickest way to secure full marks on this topic in your exams.