Biology - Online Test
Q1. Among mammals, nucleus is absent in :
Answer : Option B
Explaination / Solution:
The absence of a nucleus is an adaptation of the red blood cell for its role. It allows the red blood cell to contain more hemoglobin and, therefore, carry more oxygen molecules.Platelets are devoid of nucleus in most of the mammals.
Q2. The physical expression or appearance of a character is called as
Answer : Option D
Explaination / Solution:
The physical appearance of a character is called as phenotype. The genetic make of individual is called genotype. Tallness, round, wrinkled, yellow etc. are physical appearance.
Q3. The complete combustion of glucose produces
Answer : Option C
Explaination / Solution:
The complete combustion of glucose, which produces carbon dioxide and water as end products, yields energy most of which is given out as heat.
Q4. Which of the followings is also called sac fungi that live parasitically and in various habitats?
Answer : Option A
Explaination / Solution:
Ascomycetes is called as sac fungi that live parasitically and in various habitats. They are responsible for a number of fungal disease in plants.
Q5. Smog which doesn’t contain any secondary pollutants is
Answer : Option D
Explaination / Solution:
Classical smog does not contain any secondary pollutants. It is a mixture of fog, sulfur dioxide and coal smoke particulates. Photochemical smog is formed by chemical reactions of sunlight, nitrogen oxide and voltalic organic compounds in the atmosphere to form secondary pollutants.
Q6. Most of animals are unisexual but a few are bisexual too as
Answer : Option B
Explaination / Solution:
Most of animals possess either male or female reproductive organs, so unisexual except a few organisms like earthworm that contain both male and female reproductive parts in same individual.
Q7. Potato is a modified
Answer : Option C
Explaination / Solution:
Potato is a modified stem as it contain nodes in form of eyes on potato tubers which germinate to produce new potato plants if placed in suitable conditions.
Q8. In animal cells, during G2 phase
Answer : Option B
Explaination / Solution:
During the G2 phase, proteins and RNA are synthesised in preparation for mitosis while cell growth continues.
Q9. Plasmid is a
Answer : Option D
Explaination / Solution:
Plasmid is a small DNA molecule within a cell that is physically separated from a chromosomal DNA and can replicate independently. Plasmid is most commonly found in bacteria as small circular, double stranded DNA molecule.
Q10. Adult human kidney is metanephric. So, first embryonic tubules formed in vertebrates during embryonic development are :
Answer : Option C
Explaination / Solution:
adult human kidney is metanephric, the third and final excretory organ that develops in a vertebrate embryo. First embryonic tubules formed in vertebrates during embryonic development are pronephric.
