Agriculture - Online Test
Q1. Abscissic acid is also known as
Answer : Option D
Explaination / Solution:
ABA stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stresses.Therefore, it is also called the stress hormone.
Q2. In rosette plants, bolting is due to
Answer : Option C
Explaination / Solution:
Gibberellins also promote bolting (internode elongation just prior to flowering) in beet, cabbages and many plants with rosette habit.
Q3. Micropropagation is technique
Answer : Option C
Explaination / Solution:
Micropropagation is the technique of growing large number of plantlets using small parts of plants. Plant parts are totipotent or able to generate whole plant with small portion. This process is also called as tissue culture in which true type of plants.
Q4. Cohesion-tension theory is related to
Answer : Option D
Explaination / Solution:
The process of movement of water and minerals from roots to leaves in plant through xylem tissues is called ascent of sap. The most accepted theory of ascent of sap is cohesion-tension theory.
Q5. Filiform apparatus present in egg synergids of female gametophyte pay important role of
Answer : Option A
Explaination / Solution:
The synergids have special cellular thickening at micropylar tips called filiform apparatus which help in guiding pollen tube into egg synergids for fertilisation to form embryo.
Q6. Minerals present in the soil are absorbed by
Answer : Option D
Explaination / Solution:
Most of the minerals present in soil can enter plants through roots.
Q7. In which pteridophytes, hetersporous is produced?
Answer : Option A
Explaination / Solution:
Genera like Selaginella and Salvinia which produce two kinds of spores, macro (large) and micro (small) spores are known as heterosporous.
Q8. Carotenes protect plants from
Answer : Option C
Explaination / Solution:
Carotene is present in chloroplast along with chlorophyll pigment. This pigment protect the plants from photo-oxidation during photosynthesis at higher intensity of light.
Q9. Genes are
Answer : Option A
Explaination / Solution:
Genes are segment of DNA present on chromosome. Large numbers of genes are located on single chromosome. A gene or genes determines the traits of the individual.
Q10. In kreb cycle, isocitric acid is converted into α-keto glutaric acid by
Answer : Option D
Explaination / Solution:
Citrate is first isomerised to isocitrate and then followed by decarboxylation, leading to the formation of α-ketoglutaric acid.
