Biology - Online Test
Q1. The phenomenon involved in formation of female gametophyte is known as
Answer : Option D
Explaination / Solution:
The process of formation of female gametophyte inside the ovary by meiotic and mitotic division is called megasporogenesis.
Q2. In most mammals, the testes are located in scrotal sac for
Answer : Option B
Explaination / Solution:
Testis is located in scrotal sac out of the abdominal cavity. Sperm formation require 1-2 degree less temperature than normal body temperature. The process of sperm formation is called spermatogenesis.
Q3. Enzymes catalysing in the link together of two compounds are
Answer : Option B
Explaination / Solution:
Ligases catalyses the linking together of 2 compounds, e.g.,enzymes which catalyse joining of C-O, C-S, C-N, P-O etc. bonds.
Q4. In our blood :
i. Granulocytes which constitutes maximum percentage of total leucocytes are neutrophils.
ii. Elevated number of neutrophils in blood indicates an acute infection such as appendicitis.
i. Granulocytes which constitutes maximum percentage of total leucocytes are neutrophils.
ii. Elevated number of neutrophils in blood indicates an acute infection such as appendicitis.
Answer : Option B
Explaination / Solution:
In human blood, granulocytes and agranulocytes types of leucocytes are present. Neutrophils constitute the maximum percentage of total WBCs. Sharp increase in number of neutrophils in blood indicates an acute infection such as appendicitis.
Q5. In blood group typing in human, if an allele contributed by one parent is IA and an allele contributed by the other parent is i, the resulting blood group of the offspring will be
Answer : Option D
Explaination / Solution:
Blood group alleles IA and i is A. As allele A is dominant over the allele i. O blood group appear only when both the alleles are i.
Q6. The enzyme which converts glucose into glucose -6- phosphate is
Answer : Option A
Explaination / Solution:
A hexokinase is an enzyme that phosphorylates hexoses (six-carbon sugars), forming hexose phosphate. In most organisms, glucose is the most important substrate of hexokinases, and glucose-6-phosphate is the most important product.
Q7. Treatment of waste water is done by
Answer : Option C
Explaination / Solution:
Treatment of waste water is done by the heterotrophic microbes naturally present in the sewage. This treatment is carried out in two stages: primary treatment and secondary treatment.
Q8. The neurotoxic form of Mercury which can be directly absorbed by fishes :
Answer : Option A
Explaination / Solution:
Mercury discharged into rivers and lakes is changed by bacteria to the neurotoxic form called methyl mercury. The latter is highly poisonous and may be directly absorbed by fish.
From fishes they enter into food chain and to human by bio-magnification.
Q9. The degenerative and irreversible changes in the organism is known as
Answer : Option A
Explaination / Solution:
life cycle of organism’s starts from growth and development followed by reproductive phase. After that senescence phase starts in which degenerative changes starts which is generally irreversible and leads to death of organisms.
Q10. Which part of the plant help to hold the blade to light?
Answer : Option B
Explaination / Solution:
Thepetiole help hold the blade to light. Long thin flexiblepetioles allow leaf blades to flutter in wind, therebycooling the leaf and bringing fresh air to leaf surface.
