Agriculture - Online Test
Q1. In Kreb cycle conversion of succinyl-CoA to succinic acid by
Answer : Option A
Explaination / Solution:
Conversion of Succinyl-CoA to Succinate : Succinyl-CoA, like acetyl-CoA, has a strongly negative free energy of hydrolysis of its thioester bond In the next step of the citric acid cycle, energy released in the breakage of this bond is used to drive the synthesis of a phosphoanhydride bond in either GTP or ATP, and succinate is also formed in the process.
The enzyme that catalyzes this reversible reaction is called either succinyl-CoA synthetase or succinic thiokinase;
Q2. Silk produced by Antheraeamylitta is called
Answer : Option B
Explaination / Solution:
The silk produced by Antheraeamylitta is called Tasar silk. This silk is considered as most durable and best quality silk.
Q3. Bulliform or motor cells are present in
Answer : Option D
Explaination / Solution:
In isobilateral leaves of monocot, certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells. These are called bulliform cells.
Q4. In higher plants, the growing apical bud inhibits the growth of the lateral buds. This phenomenon is called
Answer : Option D
Explaination / Solution:
Apical dominance is the phenomenon whereby the main, central stem of the plant is dominant over (i.e., grows more strongly than) other side stems; on a branch the main stem of the branch is further dominant over its own side branchlets.
Q5. Somaclonal variation appears in plants
Answer : Option D
Explaination / Solution:
Tissue culture is mode of vitro propagation of large number of plantlets in short interval of time. During tissue culture, plants parts are kept in nutrient medium along with required hormones. Some variation arises in plants body although having same genetic traits.
Q6. The neighbouring cells are connected through cytoplasmic strands that extend through
Answer : Option A
Explaination / Solution:
Neighbouring cells are connected through cytoplasmic strands that extend through plasmodesmata. During symplastic movement, the water travels through the cells – their cytoplasm; intercellular movement is through the plasmodesmata.
Q7. Main function of pollen tube is to
Answer : Option B
Explaination / Solution:
Pollen tube is formed by germination of pollen grain on stigma of flower. Pollen grain is transferred from stigma to receptive female gametes by pollen tube formed in the style of the pistil.
Q8. Which one of the following organism help in absorption of phosphorus from soil by plants
Answer : Option B
Explaination / Solution:
Glomus is a kind of algae found in soil. This organism help in absorption of phosphorous form soil by plants.
Q9. The giant redwood tree is
Answer : Option D
Explaination / Solution:
One of the gymnosperms, Giant sequoias are the world's largest single tree with an average height of 50–85 m (164–279 ft) and 6–8 m (20–26 ft) in diamete
Q10. Which is the most effective wavelength of light for photosynthesis?
Answer : Option B
Explaination / Solution:
Certain red and blue wavelengths of light are the most effective in photosynthesis because they have exactly the right amount of energy to energize, or excite, chlorophyll electrons and boost them out of their orbits to a higher energy level.
