Plant Growth and Development - Online Test
Q1. Kinetin was identified by
Answer : Option A
Explaination / Solution:
The discovery of Kinetin is comparatively more recent. Its credit goes to Miller et al (1955) who were working in Prof. Skoog’s laboratory at the University of Wisconsin on the growth of tobacco pith callus in culture and wanted it to grow indefinitely.
Q2. A farmer grows cucumber plants in his field. He wants to increase the number of female flowers in them. Which plant hormones can be applied to achieve this?
Answer : Option D
Explaination / Solution:
Ethylene promotes female flowers in cucumbers thereby increasing the yield.
Q3. Ethylene is a
Answer : Option C
Explaination / Solution:
Ethylene is a simple gaseous hormone. It is synthesised in large amounts by tissues undergoing senescence and ripening fruits.
Q4. The most commonly used compound as a source of ethylene
Answer : Option B
Explaination / Solution:
The most widely used compound as source of ethylene is ethephon. Ethephon in an aqueous solution is readily absorbed and transported within the plant and releases ethylene slowly.
Q5. How many numbers of gibberellins are distributed in different organisms?
Answer : Option C
Explaination / Solution:
There are more than 100 gibberellins reported from widely different organisms such as fungi and higher plants. They are denoted as GA1, GA2, GA3 and so on.
Q6. Phytochrome is sensitive to
Answer : Option C
Explaination / Solution:
Phytochrome is a photoreceptor and a pigment that plants, and some bacteria and fungi, use to detect light. It is sensitive to light in the red and far-red region of the visible spectrum.
Q7. Antiauxin used in picking cotton bolls is
Answer : Option C
Explaination / Solution:
TIBA (2,3,5 Triidobenzoic acid) acts as antiauxin that inhibit root and shoot formation. TIBA is used as antiauxin in picking cotton bolls.
Q8. Which pair of enzyme promotes femaleness in flowers?
Answer : Option D
Explaination / Solution:
Flower Sex Conversions :
- Gibberellins (GA3) promote maleness
- Ethylene and auxins promote femaleness
Q9. What would be expected to happen if a rotten fruit gets mixed with unripe fruits
Answer : Option A
Explaination / Solution:
Rotten fruit produce ethylene gas that hasten the ripening of unripe fruits. So, if a rotten fruit get mixed with unripe fruits the remaining unripe get ripen faster.
Q10. If GA3 is applied to the rice seedlings, the plant will show
Answer : Option D
Explaination / Solution:
GA3 is a gibberellins that help in elongation of stem of the plant. If GA3 plant hormone is applied to the rice seedling the plant will show extra elongation of plant body.
