Photosynthesis in Higher Plants NEET Questions is a essential subject matter for NEET education, masking the structure and corporation of plant tissues and organs. Key regions include the study of meristematic and everlasting tissues, vascular bundles, and the arrangement of diverse plant components. Understanding these standards is vital for studying plant physiology and improvement. Mastery of this subject matter no longer only aids in NEET examinations however also presents a foundational understanding for advanced research in botany and associated fields.
- Introduction to Photosynthesis in Higher Plants NEET Questions
- Download: Photosynthesis in Higher Plants NEET Questions
- Chloroplast: Structure and Function
- Photosynthetic Pigments: Photosynthesis in Higher Plants NEET Questions
- Mechanism of Photosynthesis: Photosynthesis in Higher Plants NEET Questions
- Photosystems in Photosynthesis: Photosynthesis in Higher Plants NEET Questions
- Factors Affecting Photosynthesis: Photosynthesis in Higher Plants NEET Questions
- Blood Vessels and Their Functions
- Photorespiration: Photosynthesis in Higher Plants NEET Questions
- FAQs about Photosynthesis in Higher Plants NEET Questions
Introduction to Photosynthesis in Higher Plants NEET Questions
Photosynthesis in Higher Plants NEET Questions is an critical topic for NEET aspirants, because it explains the technique by using which green flowers synthesize their meals the use of daylight, carbon dioxide, and water. Understanding this topic helps college students draw close key principles inclusive of the structure of chloroplasts, light and darkish reactions, the Calvin cycle, and photorespiration. NEET questions associated with photosynthesis consciousness at the mechanisms involved, the position of pigments, the Z-scheme of electron shipping, and factors affecting the charge of photosynthesis. Mastering this bankruptcy guarantees a stable foundation in plant body structure, that is critical for scoring nicely in the NEET biology phase. Practicing questions from this topic allows students tackle associated MCQs hopefully in the course of the examination.
Significance for NEET Exam
Photosynthesis is a crucial subject matter for the NEET examination due to its central position in plant physiology and ecology. Understanding photosynthesis let you solution questions related to:
- Plant metabolism: The process of converting light strength into chemical energy.
- Plant structure: The role of chloroplasts and different organelles in photosynthesis.
- Ecology: The importance of photosynthesis in meals chains and carbon cycles.
- Biochemistry: The chemical reactions concerned in photosynthesis.
Download: Photosynthesis in Higher Plants NEET Questions
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Chloroplast: Structure and Function
Chloroplast Anatomy in Higher Plants
A chloroplast is a double-membraned organelle located in plant cells, broadly speaking in the mesophyll layer of leaves. It is the site of photosynthesis.
Key additives of a chloroplast:
- Outer membrane: A smooth membrane that encloses the chloroplast.
- Inner membrane: A folded membrane that paperwork stacks of thylakoids.
- Thylakoids: Disk-shaped structures that comprise chlorophyll and other pigments.
- Grana: Stacks of thylakoids.
- Stroma: A fluid-stuffed matrix that surrounds the thylakoids.
Role of Chlorophyll in Photosynthesis
Chlorophyll is a inexperienced pigment determined in chloroplasts that plays a vital position in photosynthesis. It absorbs daylight strength, on the whole inside the blue and pink wavelengths, and converts it into chemical electricity.
Types of chlorophyll:
- Chlorophyll a: The number one pigment concerned in photosynthesis.
- Chlorophyll b: An accent pigment that allows to soak up mild electricity.
Chlorophyll molecules are prepared into photosystems, that are clusters of pigment molecules embedded within the thylakoid membranes. Photosystems I and II are the two primary sorts concerned in photosynthesis.
Photosynthetic Pigments: Photosynthesis in Higher Plants NEET Questions
Photosynthetic pigments are molecules that soak up sunlight strength and switch it to the reaction centers of photosystems. They are critical for photosynthesis.
Types of Pigments
- Chlorophyll a: The primary pigment worried in photosynthesis. It absorbs light normally inside the blue and red wavelengths.
- Chlorophyll b: An accessory pigment that absorbs mild mainly inside the blue and yellow wavelengths. It enables to expand the range of wavelengths that a plant can soak up.
- Carotenoids: A organization of accessory pigments that encompass carotenoids (orange and yellow) and xanthophylls (yellow). They absorb mild inside the blue and inexperienced wavelengths and defend chlorophyll from photooxidation.
Light Absorption Spectrum
The light absorption spectrum of photosynthetic pigments suggests the wavelengths of mild that they take in most efficiently. Chlorophyll a and b generally take in mild in the blue and purple wavelengths, while carotenoids soak up mild inside the blue and green wavelengths.
Mechanism of Photosynthesis: Photosynthesis in Higher Plants NEET Questions
Light Reaction: Photophosphorylation
The mild reaction takes place in the thylakoid membranes of chloroplasts and entails the conversion of light energy into chemical electricity. It includes two main approaches:
Cyclic Photophosphorylation:
- Involves simplest Photosystem I.
- Electrons are cyclically handed from Photosystem I to a sequence of electron carriers and again to Photosystem I.
- The energy launched all through electron delivery is used to pump protons throughout the thylakoid membrane, developing a proton gradient.
- Protons go with the flow again thru ATP synthase, producing ATP.
- Does no longer produce NADPH.
Non-Cyclic Photophosphorylation:
- Involves both Photosystem I and Photosystem II.
- Electrons are exceeded from Photosystem II to Photosystem I, with power being used to pump protons and produce ATP.
- Electrons from Photosystem I are used to lessen NADP to NADPH.
- Water molecules are cut up to update the electrons lost by way of Photosystem II, generating oxygen as a byproduct.
Dark Reaction: Calvin Cycle
The Calvin cycle, also called the light-unbiased reaction, takes place inside the stroma of chloroplasts and entails the fixation of carbon dioxide into natural molecules. It makes use of the ATP and NADPH produced within the light response.
Key steps of the Calvin cycle:
- Carbon Fixation: CO2 is constant through the enzyme RuBisCO, forming a 6-carbon intermediate.
- Reduction: The 6-carbon intermediate is decreased to a 3-carbon molecule (glyceraldehyde-three-phosphate) the usage of ATP and NADPH.
- Regeneration: Most of the 3-carbon molecules are used to regenerate the beginning material (ribulose-1,5-bisphosphate) for the cycle.
- Glucose Synthesis: Some three-carbon molecules are mixed to form glucose.
Photosystems in Photosynthesis: Photosynthesis in Higher Plants NEET Questions
Photosystems
Photosystems are clusters of pigment molecules embedded within the thylakoid membranes of chloroplasts. They play a vital position inside the mild-dependent reactions of photosynthesis.
Photosystem I (PSI)
- Primary pigment: Chlorophyll a
- Absorption spectrum: Primarily absorbs light within the 700 nm wavelength.
- Function: Generates a sturdy decreasing electricity (NADPH) via shifting electrons to NADP+.
- Electron go with the flow: Electrons are exceeded from PSI to electron providers and finally to NADP+.
Photosystem II (PSII)
- Primary pigment: Chlorophyll a
- Absorption spectrum: Primarily absorbs mild inside the 680 nm wavelength.
- Function: Generates a proton gradient across the thylakoid membrane, main to ATP synthesis.
- Electron glide: Electrons are extracted from water molecules, handed to electron companies, and subsequently attain PSI.
The photosystems paintings together in a non-cyclic electron waft pathway. Electrons are extracted from water molecules by using PSII, passed via a sequence of electron vendors, and finally attain PSI. The electricity launched for the duration of electron transport is used to pump protons throughout the thylakoid membrane, creating a proton gradient. Protons go with the flow again via ATP synthase, generating ATP. At the same time, electrons from PSI are used to reduce NADP+ to NADPH.
Factors Affecting Photosynthesis: Photosynthesis in Higher Plants NEET Questions
Photosynthesis is stimulated by numerous environmental factors. These factors can restrict the rate of photosynthesis if they are in short supply or exceed optimal levels.
Light Intensity
- Low intensity: Photosynthesis increases with increasing light intensity up to a certain point.
- High intensity: Beyond the optimal intensity, further increases may not significantly increase photosynthesis and may even lead to photoinhibition.
CO₂ Concentration
- Low concentration: Photosynthesis increases with growing CO₂ concentration up to a certain point.
- High concentration: High CO₂ concentrations may be toxic to plants, especially at high temperatures.
Temperature
- Low temperature: Photosynthesis increases with growing temperature up to the optimum temperature.
- High temperature: Beyond the optimum temperature, enzymes involved in photosynthesis can become denatured, reducing the rate of the process.
Limiting Factors in Photosynthesis
A limiting factor is a factor that is in short supply and prevents photosynthesis from increasing, even when other factors are abundant. The limiting factor can change depending on the specific conditions.
For instance:
- In low light conditions, light intensity is the limiting factor.
- In low CO₂ conditions, CO₂ concentration is the limiting factor.
- In high temperature conditions, temperature is the limiting factor.
Understanding the limiting factors can help in optimizing plant growth conditions and increasing photosynthetic efficiency.
Blood Vessels and Their Functions
Photosynthetic Pathways
Pathway
| Pathway | Location | Process | Adaptations |
|---|---|---|---|
| C3 Pathway (Calvin Cycle) | Stroma of chloroplasts | Carbon fixation via RuBisCO, producing three-carbon molecules | Most flora |
| C4 Pathway (Hatch-Slack Pathway) | Mesophyll and package sheath cells | Carbon fixation via PEP carboxylase, producing 4-carbon molecules | Grasses, sugarcane, corn |
| CAM Pathway (Crassulacean Acid Metabolism) | Mesophyll cells | Carbon fixation and garage in natural acids at night; decarboxylation in the course of the day | Succulents, cacti |
C3 Pathway (Calvin Cycle)
Key enzyme: RuBisCO
Carbon fixation: CO2 is fixed into three-carbon molecules (glycerate-three-phosphate).
Efficiency: Less efficient in warm, dry climates because of photorespiration.
C4 Pathway (Hatch-Slack Pathway)
Key enzymes: PEP carboxylase and RuBisCO
Carbon fixation: CO2 is first of all constant into four-carbon molecules (oxaloacetate) in mesophyll cells.
Efficiency: More green in hot, dry climates due to reduced photorespiration.
CAM Plants (Crassulacean Acid Metabolism)
Key variation: Stomata open at night and close at some stage in the day to lessen water loss.
Carbon fixation: CO2 is fixed into natural acids at night and stored in vacuoles.
Decarboxylation: During the day, the saved natural acids are decarboxylated, freeing CO2 for the Calvin cycle.
Efficiency: Highly tailored to arid environments.
Photorespiration: Photosynthesis in Higher Plants NEET Questions
Mechanism of Photorespiration
Photorespiration is a technique that takes place in C3 plants below positive situations, especially excessive temperatures and low CO2 concentrations. It is an inefficient procedure that consumes ATP and releases CO2, lowering photosynthetic performance.
Steps of photorespiration:
- RuBisCO oxygenase hobby: RuBisCO, the enzyme involved in carbon fixation, also can bind to oxygen rather than CO2.
- Formation of phosphoglycolate: The oxygenation response produces phosphoglycolate, a 2-carbon compound.
- Peroxisome and mitochondria involvement: Phosphoglycolate is transported to peroxisomes and mitochondria, in which it’s far converted again into CO2 thru a sequence of reactions.
- Net lack of CO2: The ordinary procedure effects in a net lack of CO2, reducing photosynthetic performance.
Comparison between C3 and C4 Plants
| Feature | C3 Plants | C4 Plants |
|---|---|---|
| Carbon fixation | RuBisCO | PEP carboxylase |
| Initial product | three-carbon molecule (glycerate-3-phosphate) | 4-carbon molecule (oxaloacetate) |
| Location | Stroma of chloroplasts | Mesophyll and package deal sheath cells |
| Photorespiration | High | Low |
| Efficiency | Less green in warm, dry climates | More green in warm, dry climates |
| Examples | Most vegetation | Grasses, sugarcane, corn |
C4 flora have evolved mechanisms to decrease photorespiration, which includes spatially isolating carbon fixation and the Calvin cycle in different cell sorts. This lets in them to pay attention CO2 within the package deal sheath cells, wherein the Calvin cycle happens, reducing the oxygenase pastime of RuBisCO.
FAQs about Photosynthesis in Higher Plants NEET Questions
Q. What is photosynthesis?
Ans: Photosynthesis is the manner by which green flowers convert mild power into chemical energy, generating glucose and oxygen from carbon dioxide and water.
Q. Where does photosynthesis take location in flowers?
Ans: Photosynthesis occurs in the chloroplasts, in particular inside the mesophyll cells of leaves.
Q. What are the 2 predominant levels of photosynthesis?
Ans: Photosynthesis includes the mild-based reactions (takes place inside the thylakoid membrane) and the Calvin cycle (mild-unbiased reactions, occurs inside the stroma).
Q. What role does chlorophyll play in photosynthesis?
Ans: Chlorophyll absorbs light power, which is essential for the conversion of carbon dioxide and water into glucose.
Q. What is the importance of the Calvin cycle?
Ans: The Calvin cycle makes use of ATP and NADPH produced in the mild-structured reactions to restoration carbon dioxide into glucose.
