Agriculture - Online Test
Q1. Chromosome theory of XY sex determination was proposed by
Answer : Option A
Explaination / Solution:
Nettie Stevens and Edmund Beecher Wilson independently discovered the chromosomal XY sex-determination system (that males have XY and females have XX sex chromosomes).
Wilson made some of the discoveries in his partially correct 1900 paper, while Steven’s 1905 paper filled in the blanks and corrected some of Wilson’s errors.
Stevens and Wilson worked independently of each other in their discovery of the chromosomal basis of sexual differentiation.
Q2. Which compound consists of 5 carbon atoms?
Answer : Option B
Explaination / Solution:
Alpha-ketoglutaric acid is an important biological compound and is a key intermediate in the Krebs cycle. Alpha-ketoglutaric acid occurs naturally within cells.
One of its functions is to combine with ammonia to form glutamic acid and then glutamine. Another function is to combine with nitrogen released in the cell, therefore preventing nitrogen overload.
Q3. The fruit develop form a whole inflorescence is called
Answer : Option C
Explaination / Solution:
True frui is the fruit that develops from ovary only. In composite fruits, whole inflorescence develops into fruits as in case of jackfruit.
Q4. The vascular bundles are closed when they
Answer : Option B
Explaination / Solution:
In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues they are referred to as closed.2
Q5. Natural cytokinins are synthesized in
Answer : Option A
Explaination / Solution:
Natural cytokinins are synthesised in regions where rapid cell division occurs, for example, root apices.
Q6. Which of the following is not correct about artificial means of vegetative propagation
Answer : Option B
Explaination / Solution:
During vegetative propagation, new organisms are formed by single plant parts. So, new individuals are genetically similar to each other and there is no genetic variation.
Q7. The correct order for instrument used for measuring stomatal size, atmospheric pressure and osmosis is
Answer : Option A
Explaination / Solution:
Porometer is used to measure stomatal size, monometer is used to measure atmospheric pressure and osmometer is used to measure osmosis.
Q8. The fertilisation in which male gametes are carried through pollen tube is called as
Answer : Option D
Explaination / Solution:
Pollen grain lands on stigma for pollination. The pollen grain germinates and moves towards egg through pollen tube. This male and female gamete fusion is called siphonogamy.
Q9. Which group of three elements is required for both photosynthesis mitochondrial electrons transport?
Answer : Option B
Explaination / Solution:
Three elements, Cu, Mn and Fe is required for both photosynthesis as well as mitochondrial electron transport for ATP formation.
Q10. The root like structure which help in anchorage and absorption of water in Bryophytes is called
Answer : Option A
Explaination / Solution:
Rhizoids are the root like structures present in Bryophytes that help in anchorage and absorption of water. They are thin hair like structure generally present at ventral surface of Bryophytes.
