Agriculture - Online Test
Q1. In wall of guard cell, cellulose microfibrils are arranged
Answer : Option B
Explaination / Solution:
The cells surrounding the stomata pore is called guard cell. It is bean shaped in dicots and dumbbell shape in monocots. Cellulose microfibrils are arranged radially in guard cell.
Q2. Dormancy is the
Answer : Option A
Explaination / Solution:
Dormancy is the state of state of inactivity during which metabolic process slows down. Seed may remain viable to several months to years depending upon type of seeds and condition.
Q3. Plant with zinc deficiency show reduced biosynthesis of
Answer : Option B
Explaination / Solution:
Plants obtain zinc as Zn2+ ions. It activates various enzymes,especially carboxylases. It is also needed in the synthesis of auxin.If there is deficiency in zinc to plants then it leads to reduced synthesis of auxin.
Q4. Pollen grain germinate through
Answer : Option D
Explaination / Solution:
Pollen grain is two layered structure. The outer layer is called exine and inner layer is called intine. Exine is a hard covering, except at germ pore, through which pollen grain germinate.
Q5. Who proved that oxygen evolved in photosynthesis comes from water?
Answer : Option C
Explaination / Solution:
Ruben, Hassid and Kamen proved that Oxygen evolved during photosynthesis comes from water and not from carbon dioxide. For this, they used water with heavy isotope of oxygen, 18O.
Q6. On germination, moss spore produce
Answer : Option A
Explaination / Solution:
The spore of moss germinate to produce protonema. It is a creeping, green, branched and frequently filamentous stage , which develops into secondary protonema as a lateral bud.This stage bears the sex organs.
Q7. In human beings, if ovum fertilizes with a sperm carrying X-chromosome the zygote develops into
Answer : Option B
Explaination / Solution:
Male produce two kinds of sperms, half carrying X and half carrying Y sex chromosome besides 22 autosomes. If ovum is fertilized by sperm carrying X chromosome the sex of child developed is female.
Q8. Acetyl CoA combine with oxalo-acetate in presence of condensing enzyme citrate synthetase to form 6-C compound called
Answer : Option C
Explaination / Solution:
Acetyl CoA combine with oxalo-acetate in presence of enzyme citrate synthetase to form 6-C compound called citric acid during Kreb’s cycle.
Q9. In arborescent monocots stem, a secondary cambium grows in
Answer : Option B
Explaination / Solution:
In arborescent monocots stem, secondary cambium grows in hypodermal region for secondary growth that increase the girth of the stem.
Q10. 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.
