Biology - Online Test
Q1. The single cotyledon of cereal grain is
Answer : Option A
Explaination / Solution:
In monocotyledonous seeds single cotyledon is called as scutellum. It is found in cereal grains like rice, wheat, maize and other monocots.
Q2. A farmer grows cucumber plants in his field. He wants to increase the number of female flowers in them. Which plant hormones can be applied to achieve this?
Answer : Option D
Explaination / Solution:
Ethylene promotes female flowers in cucumbers thereby increasing the yield.
Q3.
Statement I: Asexual reproduction involves fusion of gametes.
Statement II: Asexually produced offspring are genetically identical.
Statement III: Asexual reproduction occurs in unfavorable condition only.
Answer : Option D
Explaination / Solution:
In asexual reproduction, fusion of gametes do not takes place and asexual reproduction occurs in favorable conditions. As fusion of gametes do not takes place, all the individuals are genetically identical to each other.
Q4. Which of the following is not a layer found in lakes?
Answer : Option B
Explaination / Solution:
Lentic zone is found in flowing terrestrial water such as rivers and streams. Lake stratification have limnetic, littoral and profundal zone only.
Q5. Which disorder is caused due to wild contractions in muscles?
Answer : Option C
Explaination / Solution:
Tetany is caused due to rapid spasms (wild contractions) in muscle due to low Ca++ inbody fluid.
Q6. Alpha lactalbumin present in milk is
Answer : Option A
Explaination / Solution:
The milk produced by transgenic cow contain a protein called alpha lactaalbumin. The milk containing this protein is more suitable for babies as compare to normal cow’s milk.
Q7. Which one the following in not an Intra-uterine device
Answer : Option B
Explaination / Solution:
Vaults is not an intra-uterine device used by females to prevent unwanted pregnancy. It is a barrier method of contraception made of rubber.
Q8. Both WBC and RBC are formed in the
Answer : Option C
Explaination / Solution:
In adults, both WBC and RBC are formed in the bone marrow that is located in long bones such as thighs.
Q9. Who demonstrated that the extract of the infected plants of tobacco could cause infection in healthy plants?
Answer : Option A
Explaination / Solution:
Beijerinek is considered one of the founders of virology. In 1898, he published results on the filtration experiments demonstrating that tobacco mosaic disease is caused by an infectious agent smaller than a bacterium and called the fluid as Contagiumvivum fluidum(infectious living fluid).
Q10. In diffusion, the movement of molecule across typical plant cell takes about
Answer : Option D
Explaination / Solution:
Long distance transport of substances within a plant cannot be by diffusion alone. Diffusion is a slow process. It can account for only short distance movement of molecules. For example, the movement of a molecule across a typical plant cell (about 50 μm) takes approximately 2.5 s.
