NEET Botany 5 — Questions and Answers
Question 1: Which of the following is an example of ex situ conservation?
- Biosphere reserve
- Wildlife sanctuary
- Seed bank (Correct answer)
- National park
Correct answer: Seed bank
Seed banks are a form of ex situ conservation where plant genetic material is preserved outside the natural habitat.
Question 2: The Calvin cycle requires how many molecules of ATP to fix one molecule of CO2 into carbohydrate?
- 1
- 2
- 3 (Correct answer)
- 6
Correct answer: 3
Fixation of one CO2 molecule in the Calvin cycle requires 3 ATP and 2 NADPH to produce one molecule of G3P.
Question 3: Which element is specifically required for the functioning of nitrogenase enzyme in nitrogen fixation?
- Iron and Copper
- Molybdenum and Iron (Correct answer)
- Zinc and Manganese
- Cobalt and Nickel
Correct answer: Molybdenum and Iron
Nitrogenase, the enzyme complex responsible for biological nitrogen fixation, requires both molybdenum and iron as essential cofactors.
Question 4: Which of the following is NOT a product of the light reactions of photosynthesis?
- ATP
- NADPH
- O2
- Glucose (Correct answer)
Correct answer: Glucose
Glucose is synthesized in the Calvin cycle (dark reactions) using ATP and NADPH produced by the light reactions, not directly from light reactions.
Question 5: In the alternation of generations in bryophytes, which generation is dominant?
- Sporophyte
- Gametophyte (Correct answer)
- Both are equally dominant
- Neither; bryophytes have no alternation of generations
Correct answer: Gametophyte
In bryophytes, the gametophyte (haploid) generation is the dominant, photosynthetic, and independent phase, while the sporophyte is dependent on the gametophyte.
Question 6: Emerson's enhancement effect demonstrated that:
- Two pigment systems work together to enhance photosynthesis (Correct answer)
- Red light alone is sufficient for maximum photosynthesis
- Chlorophyll b is the primary photosynthetic pigment
- CO2 concentration limits photosynthesis
Correct answer: Two pigment systems work together to enhance photosynthesis
Emerson's enhancement effect showed that simultaneous illumination with red (680 nm) and far-red (700 nm) light gives greater photosynthesis than either wavelength alone, supporting the existence of two photosystems.
Question 7: Which of the following correctly describes a diadelphous stamen arrangement?
- All stamens united into one bundle by their filaments
- Stamens united into two bundles (Correct answer)
- All stamens are free from each other
- Stamens attached to petals
Correct answer: Stamens united into two bundles
Diadelphous stamens are united into two groups by their filaments, as seen in pea where 9 stamens form one bundle and 1 stamen is free.
NEET Botany 5
Which of the following is an example of ex situ conservation?