Agriculture - Online Test
Q1. Primary endosperm cell (PEC) is triploid (3n) structure as it is formed by
Answer : Option C
Explaination / Solution:
Primary endosperm cell is triploid because it is formed by fusion of two polar nuclei and one male gamete called triple fusion. Primary endosperm cells divides further to form endosperm that provide nourishment to embryo.
Q2. Main role of minor elements is to act as
Answer : Option D
Explaination / Solution:
Micronutrients are required in very small quantity. The main role of micronutrients is to act as cofactor of enzyme. Co-factors increase the efficiency of enzymes.
Q3. Male and female gametophytes do not have free independent existence in
Answer : Option A
Explaination / Solution:
Unlike bryophytes and pteridophytes , in gymnosperms ( Cedrus )the male and the female gametophytes do not have an independent free-living existence.
Q4. Electrons from exited chlorophyll molecules of photosystem II are accepted first by
Answer : Option C
Explaination / Solution:
During potophosphorylation, electron released during photolysis of water passes through electron transport chain. The electron from exited chlorophyll molecules of Photosystem II are accepted first by quinine.
Q5. The phenomenon of exchange of segments of chromosome between paternal and maternal chromosome is called
Answer : Option C
Explaination / Solution:
The exchange of segments of chromosome between homologous chromosomes during reduction division is called crossing over. It creates variation in the individuals of same parents.
Q6. Cellular respiration first takes place in
Answer : Option C
Explaination / Solution:
Cellular respiration takes place in two steps- Glycolysis and Kreb’s cycle. Glycolysis occurs in cytoplasm of cells and Kreb’s cycle in mitochondria. So, first step of respiration takes place in cytoplasm.
Q7. The Aleurone layer of Maize grain is especially rich in
Answer : Option C
Explaination / Solution:
Aleurone layer of maize grain is rich in proteins. It is the outermost layer of the endosperm followed by the inner starchy endosperm.
Q8. Quiescent centre is found in the plant at
Answer : Option C
Explaination / Solution:
Quiescent centre is a small group of cells with low mitotic activity. It is found at the tips of growing roots in the root meristem.
Q9. Parthenocarpy can be induced to develop seedless fruit by application of
Answer : Option A
Explaination / Solution:
Auxins (IAA,IBA)also induce parthenocarpy,(Seed less fruits) e.g., in tomatoes.
Q10. Asexual reproduction is common in
Answer : Option B
Explaination / Solution:
Asexual reproduction is common in Protists and Monera. Both these kinds include organisms having single celled body. Binary and multiple fissions are generally followed for asexual mode of reproduction.
