Agriculture - Online Test
Q1. Which part of epidermis of leaf contains less stomata?
Answer : Option A
Explaination / Solution:
There are a number of differences between abaxial and adaxial stomata. First, stomatal density is usually higher on the abaxial surface than it is on the adaxial surface of leaves
Q2. The graphical representation of the total growth against time is called
Answer : Option B
Explaination / Solution:
A growth curve is an empirical model of the evolution of a quantity over time or a graphical representation of how a particular quantity increases over time.
Growth curves are used in statistics to determine the type of growth pattern of the quantity - be it linear, exponential or cubic.
It is also known as Sigmoid curve.
Q3. Which type of vegetative propagation is present in bamboo
Answer : Option A
Explaination / Solution:
Sucker is underground shoot that some stage emerges above the soil surface and gives rise to a new plant. It is initially nourished by parent plant but later become independent.
Q4. Development of fruit without fertilization is called
Answer : Option D
Explaination / Solution:
Fruit formation without fertilisation results into seedless fruit. Parthenogenesis is development of new individual from unfertilised eggs. Parthenocarpy can be induced artificially using plant hormone auxin.
Q5. Which one is not shown by plasmolysis
Answer : Option A
Explaination / Solution:
Plasmolysis is the shrinking of cell membrane due to exosmosis. Plasmolysis shows that cell membrane is semipermeable and elastic but do not show that cell wall is semipermeable.
Q6. If an endosperm cell of angiosperm contain 24 chromosome, the number of chromosome in each cell of root is
Answer : Option C
Explaination / Solution:
Endosperm cells are triploid as they are formed by triple fission of two polar nuclei and one male gamete. So, haploid cell will contain 8 chromosomes only. Root cells are diploid. Hence root cell will contain 16 chromosomes.
Q7. Analysis of xylem sap shows
Answer : Option A
Explaination / Solution:
Mineral salts are translocated through xylem along with the ascending stream of water, which is pulled up through the plant by transpirational pull.
Q8. Bryophytes flourish is moist and shady environments because
Answer : Option D
Explaination / Solution:
These plants can live in soil but are dependent on water for sexual reproduction as they release antherozoids into water where they come in contact with archegonium to produce zygote. They usually occur in damp, humid and shaded localities.
Q9. In PSI, the reaction centre the chlorophyll a has an absorption peak at
Answer : Option B
Explaination / Solution:
In PS I the reaction centre chlorophyll a has an absorption peak at 700 nm, hence is called P700.
Q10. Chromosomal theory of inheritance was experimentally verified by T.H.Morgan and his colleagues working with tiny flies
Answer : Option D
Explaination / Solution:
T.H.Morgan worked on the tiny fruit fly called Drosophila melanogaster. This tiny fly shows variation in eye colour and can be easily crossed with other to show the flow trait.
