explain the process of photosynthesis with the help of a word equation.
describe respiration in plants.
differentiate between photosynthesis and respiration (any three points)
why is chlorophyll essential for photosynthesis?
explain how water absorbed by roots reaches the leaves
why do plants respire both during day and night?
explain the role of carbon dioxide in photosynthesis.
what is transpiration? write any two functions of transpiration
why do leaves have a broad and flat structure?
explain why starch test is performed on leaves.
how does food prepared in leaves reach roots and stems?
explain the importance of respiration for plants.
why do non - green plants not perform photosynthesis?
what will happen if a plant is kept in darkness for a long time?
explain the role of stomata in plants.
why is iodine used to test starch in leaves?
explain the importance of oxygen released during photosynthesis.
what happens during gaseous exchange in plants?
explain why photosynthesis is called an anabolic process
how are photosynthesis and respiration interrelated?
5 mark questions (10 ques

Question

Accepted Answer

Since you've provided a list of biology - related questions (like questions about photosynthesis, respiration in plants, etc.), here are answers to some of them:

### 1. Explain the process of photosynthesis with the help of a word equation.
# Brief Explanations:
Photosynthesis is the process by which green plants (and some other organisms) use sunlight, carbon dioxide, and water to produce glucose (a type of sugar) and oxygen. Chlorophyll (the green pigment in plants) captures light energy. The word equation for photosynthesis is: Carbon Dioxide + Water $\xrightarrow[	ext{Chlorophyll}]{	ext{Sunlight}}$ Glucose + Oxygen. In symbolic terms, it is $6CO_2 + 6H_2O \xrightarrow[	ext{Chlorophyll}]{	ext{Light Energy}} C_6H_{12}O_6 + 6O_2$.
# Answer:
The process of photosynthesis: Green plants use light energy (captured by chlorophyll), carbon dioxide ($CO_2$) from the air, and water ($H_2O$) from the soil to produce glucose ($C_6H_{12}O_6$) and oxygen ($O_2$). The word equation is: Carbon Dioxide + Water $\xrightarrow[	ext{Chlorophyll}]{	ext{Sunlight}}$ Glucose + Oxygen.

### 2. Describe respiration in plants.
# Brief Explanations:
Respiration in plants is a process where plants break down glucose (produced during photosynthesis) to release energy. It occurs in all plant cells, both during the day and night. The word equation for respiration is: Glucose + Oxygen $
ightarrow$ Carbon Dioxide + Water + Energy. In this process, the energy released is used for various metabolic activities like growth, repair, and reproduction of the plant. There are two types of respiration: aerobic (using oxygen) and anaerobic (without oxygen, but it is less common in plants and produces less energy).
# Answer:
Respiration in plants is the process of breaking down glucose (obtained from photosynthesis) to release energy. It occurs in all plant cells. The word equation is: Glucose + Oxygen $
ightarrow$ Carbon Dioxide + Water + Energy. Energy released is used for plant activities (growth, repair, etc.). It can be aerobic (with $O_2$) or anaerobic (without $O_2$, less common).

(We can choose any three of these differences. For example, function, energy change, and location)
# Answer:
- **Function**: Photosynthesis produces glucose (food) and $O_2$; Respiration breaks down glucose to release energy.
- **Energy Change**: Photosynthesis stores energy; Respiration releases energy.
- **Location**: Photosynthesis occurs in chloroplasts (green parts); Respiration occurs in mitochondria (all cells).

### 4. Why is chlorophyll essential for photosynthesis?
# Brief Explanations:
Chlorophyll is the green pigment present in the chloroplasts of plant cells. It has the ability to absorb light energy from the sun. This light energy is the driving force for the chemical reactions in photosynthesis. Without chlorophyll, plants would not be able to capture the light energy needed to convert carbon dioxide and water into glucose and oxygen. So, chlorophyll is essential as it is the molecule that traps the solar energy required for the photosynthesis process.
# Answer:
Chlorophyll is essential for photosynthesis because it absorbs light energy from the sun. This light energy is required to power the chemical reactions that convert $CO_2$ and $H_2O$ into glucose and $O_2$ during photosynthesis.

### 5. Explain how water absorbed by roots reaches the leaves.
# Brief Explanations:
Water is absorbed by the root hairs (which are thin - walled and have a large surface area) from the soil through osmosis. Once absorbed, it moves into the root cortex. Then, it enters the xylem vessels (a part of the vascular system in plants) in the root. The xylem forms a continuous tube - like structure from the roots to the leaves. Water moves up the xylem due to two main forces: transpiration pull (the loss of water from the leaves through stomata creates a suction force that pulls water up from the roots) and root pressure (the pressure exerted by the roots as they continue to absorb water). This movement of water in the xylem is also aided by the cohesive (water molecules sticking to each other) and adhesive (water molecules sticking to the xylem walls) properties of water.
# Answer:
1. Water is absorbed by root hairs from soil via osmosis.
2. It moves to root cortex, then into xylem (vascular tissue).
3. Xylem forms a continuous tube from roots to leaves.
4. Water moves up xylem due to transpiration pull (suction from leaf water loss) and root pressure. Cohesion (water - water attraction) and adhesion (water - xylem wall attraction) also help.

### 6. Why do plants respire both during day and night?
# Brief Explanations:
Respiration is the process by which plants break down glucose to release energy. This energy is required for all the metabolic activities of the plant, such as growth, repair, transport of substances, and synthesis of new molecules. Photosynthesis (which produces glucose) occurs only during the day (when there is sunlight). But the plant needs energy all the time, even at night when photosynthesis is not happening. So, to meet the continuous energy demand for activities like cell division, protein synthesis, and maintaining the turgidity of cells, plants respire both during the day and at night.
# Answer:
Plants respire day and night because they need energy continuously for metabolic activities (growth, repair, transport, etc.). Photosynthesis (which makes glucose) happens only during the day, but energy from glucose breakdown (respiration) is needed 24/7.

### 7. Explain the role of carbon dioxide in photosynthesis.
# Brief Explanations:
Carbon dioxide is one of the raw materials for photosynthesis. During photosynthesis, carbon dioxide enters the plant through the stomata (tiny pores on the leaves). Inside the chloroplasts, carbon dioxide molecules are used in the light - independent reactions (also known as the Calvin cycle). In these reactions, carbon dioxide is fixed (converted from an inorganic form to an organic form) and combined with hydrogen (from water) to form glucose. So, carbon dioxide provides the carbon atoms that are used to build the glucose molecule, which is the main product of photosynthesis and the source of energy and building material for the plant.
# Answer:
Carbon dioxide is a raw material for photosynthesis. It enters plants through stomata. In chloroplasts, $CO_2$ is fixed and combined with hydrogen (from $H_2O$) to form glucose (provides carbon for glucose synthesis).

### 8. What is transpiration? Write any two functions of transpiration.
# Brief Explanations:
Transpiration is the process of loss of water in the form of water vapor from the aerial parts of the plant (mainly through the stomata on the leaves).
- **Function 1: Transpiration Pull**: It creates a suction force (transpiration pull) that helps in the upward movement of water and minerals from the roots to the leaves through the xylem.
- **Function 2: Cooling Effect**: The evaporation of water during transpiration cools the plant. Just like how sweating cools our body, the loss of water vapor from the plant's leaves lowers the temperature of the plant, protecting it from overheating, especially in hot weather.
- **Function 3 (optional, but for two we can choose the first two)**: It also helps in the absorption and distribution of minerals. As water moves up due to transpiration, minerals dissolved in the water are also transported to different parts of the plant.
# Answer:
Transpiration: Loss of water vapor from plant aerial parts (mostly leaves via stomata).
Functions:
1. Creates transpiration pull to move water/minerals from roots to leaves.
2. Cools the plant (evaporation of water lowers plant temperature).

### 9. Why do leaves have a broad and flat structure?
# Brief Explanations:
Leaves have a broad and flat structure to maximize the surface area available for photosynthesis. A larger surface area allows the leaf to capture more sunlight, which is essential for the photosynthesis process. Also, this broad and flat shape helps in the efficient exchange of gases (carbon dioxide intake and oxygen release) as it provides more space for the stomata to be present and for the diffusion of gases to occur. Additionally, it helps in the absorption of light from different angles, ensuring that the chlorophyll in the leaf cells can capture as much light energy as possible.
# Answer:
Leaves are broad and flat to maximize surface area. This helps in:
- Capturing more sunlight for photosynthesis.
- Efficient gas exchange ( $CO_2$ intake, $O_2$ release) via stomata.
- Absorbing light from various angles.

### 10. Explain why starch test is performed on leaves.
# Brief Explanations:
Starch is a storage form of glucose, and glucose is the main product of photosynthesis. By performing a starch test on leaves, we can determine if photosynthesis has occurred. The test involves using iodine (which turns blue - black in the presence of starch). If a leaf tests positive for starch (turns blue - black with iodine), it indicates that photosynthesis has taken place and glucose (produced during photosynthesis) has been converted into starch and stored in the leaf. This test is also used to study the factors affecting photosynthesis, like the effect of light, carbon dioxide, or chlorophyll on the process. For example, if a leaf is kept in the dark, it will not produce starch, and the iodine test will be negative, showing that light is necessary for photosynthesis.
# Answer:
Starch test on leaves is done to check if photosynthesis occurred. Starch is a glucose (photosynthesis product) storage form. Iodine turns blue - black with starch. A positive test (blue - black) shows photosynthesis made glucose (stored as starch). It also helps study photosynthesis - affecting factors (e.g., light: dark - kept leaves test negative for starch).

### 11. How does food prepared in leaves reach roots and stems?
# Brief Explanations:
Food (glucose, which is often converted to sucrose for transport) prepared in the leaves during photosynthesis is transported to other parts of the plant (like roots and stems) through the phloem, which is a part of the vascular system in plants. The phloem consists of sieve tubes and companion cells. The process of transport of food in the phloem is called translocation. In translocation, food is moved from the source (the leaves, where it is produced) to the sink (the roots, stems, or other parts where it is needed for growth, storage, or respiration). The movement of food in the phloem can be bidirectional (it can move up or down depending on where the food is needed). For example, in a growing stem, food may move from the leaves to the stem cells, and in a storage root, food may move from the leaves to the root for storage.
# Answer:
Food (glucose, often as sucrose) from leaves is transported to roots/stems via phloem (vascular tissue). This process is called translocation. Phloem (sieve tubes + companion cells) moves food from source (leaves, where made) to sink (roots/stems, for growth/storage/respiration). Transport can be bidirectional (up/down as needed).

### 12. Explain the importance of respiration for plants.
# Brief Explanations:
Respiration is important for plants because it releases energy from glucose. This energy is used for all the metabolic activities of the plant, such as:
- **Growth**: Energy is needed for cell division, elongation, and the formation of new tissues.
- **Reproduction**: For the development of flowers, fruits, and seeds.
- **Transport**: To move substances like water, minerals, and food within the plant.
- **Synthesis of Molecules**: For the synthesis of proteins, lipids, and other essential molecules.
- **Maintenance of Turgidity**: To maintain the turgor pressure in cells, which is important for the structure and function of the plant (e.g., keeping the leaves upright). Without respiration, plants would not be able to perform these vital functions and would eventually die.
# Answer:
Respiration is vital for plants as it releases energy from glucose. This energy is used for:
- Growth (cell division, elongation).
- Reproduction (flower/fruit/seed development).
- Transport (of water, minerals, food).
- Synthesis of molecules (proteins, lipids).
- Maintaining turgidity (cell structure/function).

### 13. Why do non - green plants not perform photosynthesis?
# Brief Explanations:
Photosynthesis requires chlorophyll, which is the green pigment that captures light energy. Non - green plants do not have chlorophyll (or have very little of it). Since chlorophyll is essential for capturing the light energy needed to drive the photosynthesis process (to convert carbon dioxide and water into glucose and oxygen), non - green plants cannot perform photosynthesis. Instead, they obtain their food by being parasitic (living on other plants and taking their nutrients) or saprophytic (feeding on dead and decaying organic matter). For example, fungi are non - green plants (they are actually in a separate kingdom, but in the context of plant - like organisms) and they decompose dead matter to get nutrients.
# Answer:
Non - green plants lack chlorophyll. Chlorophyll is essential to capture light energy for photosynthesis. Without chlorophyll, they can't convert $CO_2$ and $H_2O$ to glucose/$O_2$, so they don't perform photosynthesis. They get food via parasitism (on other plants) or saprophytism (on d…

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QUESTION IMAGE

Question

Explanation:

1. Explain the process of photosynthesis with the help of a word equation.

Answer:

2. Describe respiration in plants.

Aspect	Photosynthesis	Respiration
Energy Change	Stores energy (in the form of glucose).	Releases energy (from glucose).
Location	Occurs in chloroplasts (only in green parts of plants).	Occurs in mitochondria (in all plant cells).
Time of Occurrence	Occurs during the day (needs sunlight).	Occurs all the time (day and night).