NEET UG Plant Physiology: Photosynthesis in Higher Plants – Chapter Test
NEET UG Plant Physiology: Photosynthesis in Higher Plants – Chapter Test is an online chapter test in the NEET UG pattern, covering Plant Physiology. Attempt it on SeatBeat with a timer like the real exam, then see a detailed solution for every question and your score and weak-topic analysis.
Topics in this test
| Topic | Questions |
|---|---|
| Plant Physiology | 20 |
Difficulty: 10 medium · 10 hard
Photosynthesis in Higher Plants MCQ questions with answers
The first 3 of 20 questions. Unlock the series for the rest, each with a solution.
Q1. The two energy-rich products of the light reaction that are consumed in the biosynthetic (Calvin) phase to reduce CO2 are:
प्रकाश अभिक्रिया के दो ऊर्जा-समृद्ध उत्पाद जो CO2 के अपचयन हेतु जैवसंश्लेषी (केल्विन) अवस्था में उपयोग होते हैं, वे हैं:
- A. ATP and O2 / ATP और O2
- B. NADPH and O2 / NADPH और O2
- C. ATP and NADPH / ATP और NADPH
- D. ADP and NADP+ / ADP और NADP+
Solution
The light reaction supplies ATP and NADPH (the 'assimilatory powers') to the Calvin cycle, while O2 is released merely as a by-product.
प्रकाश अभिक्रिया केल्विन चक्र को ATP और NADPH ('स्वांगीकरण शक्ति') प्रदान करती है, जबकि O2 केवल एक उपोत्पाद के रूप में मुक्त होती है।
Q2. CAM plants are able to fix a large amount of CO2 as organic acid during the night chiefly because:
CAM पादप रात के दौरान बड़ी मात्रा में CO2 को कार्बनिक अम्ल के रूप में स्थिर कर पाते हैं, मुख्यतः इसलिए कि:
- A. Their stomata remain open during the day and closed at night / उनके रंध्र दिन में खुले और रात में बंद रहते हैं
- B. They carry out the Calvin cycle only at night / वे केवल रात में केल्विन चक्र संपन्न करते हैं
- C. Their stomata remain open at night and closed during the day / उनके रंध्र रात में खुले और दिन में बंद रहते हैं
- D. They lack RuBisCO and so cannot fix CO2 in daylight / उनमें RuBisCO नहीं होता और इसलिए वे दिन के प्रकाश में CO2 स्थिर नहीं कर सकते
Solution
In CAM plants the stomata open at night (when transpirational loss is low) and close during the day, allowing nocturnal CO2 uptake and its fixation into organic acids.
CAM पादपों में रंध्र रात में खुलते हैं (जब वाष्पोत्सर्जनीय हानि कम होती है) और दिन के दौरान बंद रहते हैं, जिससे रात्रिकालीन CO2 ग्रहण और उसका कार्बनिक अम्लों में स्थिरीकरण संभव होता है।
Q3. Which one of the following represents the correct sequence of the three phases of the Calvin cycle?
निम्नलिखित में से कौन-सा केल्विन चक्र की तीन अवस्थाओं के सही अनुक्रम को दर्शाता है?
- A. Carboxylation → reduction → regeneration / कार्बोक्सिलीकरण → अपचयन → पुनर्जनन
- B. Regeneration → carboxylation → reduction / पुनर्जनन → कार्बोक्सिलीकरण → अपचयन
- C. Reduction → carboxylation → regeneration / अपचयन → कार्बोक्सिलीकरण → पुनर्जनन
- D. Carboxylation → regeneration → reduction / कार्बोक्सिलीकरण → पुनर्जनन → अपचयन
Solution
The Calvin cycle proceeds as carboxylation of RuBP, reduction of 3-PGA to triose phosphate, and finally regeneration of the acceptor RuBP.
केल्विन चक्र RuBP के कार्बोक्सिलीकरण, 3-PGA के ट्रायोस फॉस्फेट में अपचयन, और अंततः ग्राही RuBP के पुनर्जनन के रूप में आगे बढ़ता है।
Frequently asked questions
How many questions are in the NEET UG Plant Physiology: Photosynthesis in Higher Plants – Chapter Test?
20 questions for 20 marks, to be answered in 20 minutes.
Is there negative marking in the NEET UG Plant Physiology: Photosynthesis in Higher Plants – Chapter Test?
Yes — 0.25 marks are deducted for each wrong answer, as in the real exam pattern.
Which topics does the NEET UG Plant Physiology: Photosynthesis in Higher Plants – Chapter Test cover?
Plant Physiology (20 questions).
Is the NEET UG Plant Physiology: Photosynthesis in Higher Plants – Chapter Test free?
It is part of the NEET UG 2027 Mock Test Series (134 tests, ₹299). You can first try Biology in Human Welfare – Topic Test for free.
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