Biology - Online Test
Q1. Natural selection is a process in which heritable variations enabling better survival are enabled to
Answer : Option A
Explaination / Solution:
Natural selection is a process in which heritable variations enabling better survival are enabled to reproduce and leave greater number of progeny in the habitat to increase in number faster than other species.
Q2. Name the spermicidal cream developed by Central Drug Research Institute (Lucknow), India.
Answer : Option A
Explaination / Solution:
Spermacid
Q3. Gel electrophoresis is used for
Answer : Option B
Explaination / Solution:
Gel electrophoresis is used to separate macromolecules like DNA, RNA and proteins. DNA fragments are separated according to their size. Proteins can be separated according to their size and their charge (different proteins have different charges).
This is an important tool to study the genome of an individual.
Q4. The …….. is the sexual intercourse between male and female sex.
Answer : Option D
Explaination / Solution:
Transfer of male gametes (sperm) into female genital tract occurs during sexual intercourse that may leads to fertilisation of ovum for pregnancy. Sexual intercourse is called as coition or coitus.
Q5. Grow slower in new habitat is
Answer : Option D
Explaination / Solution:
Variation due to mutation or variation due to recombination during gametogenesis results in changed frequency of genes and alleles in future generation which results into stabilization and directional change in which more individual acquire mean character value.
Q6. Natural method of contraception works on the principle of
Answer : Option B
Explaination / Solution:
Natural method of contraception works on the principles of avoiding meeting of ovum and sperm for fertilisation. Ovum is released in the middle of menstrual cycle, avoiding sex during that interval is necessary in this method.
Q7. Which chromosome of human genome contains least number of genes?
Answer : Option A
Explaination / Solution:
There are 23 pairs of chromosome in human cells. The chromosome Y is the smallest and contain least number of gene (231) and chromosome 1 contain highest number of gene (2968).
Q8. Ovulation occurs on the ------ day of menstrual cycle.
Answer : Option D
Explaination / Solution:
The release of ovum from ovary during menstrual cycle is is called ovulation. Ovulation occurs in the middle of menstrual cycle that is on 14-16th day of start of menstrual cycle.
Q9. Which of the following factors influence the Hardy-Weinberg equilibrium?
i. Gene migration
ii. Genetic drift
iii. Mutation
iv. Reproduction
v. Genetic recombination
i. Gene migration
ii. Genetic drift
iii. Mutation
iv. Reproduction
v. Genetic recombination
Answer : Option B
Explaination / Solution:
The Hardy–Weinberg principle, also known as the Hardy–Weinberg equilibrium, model, theorem, or law, states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences.
These influences include mutation, selection, genetic drift, gene migration, gene flow, genetic recombination and meiotic drive.
Q10. The method in which male partner withdraw penis from vagina just before the ejaculation is called
Answer : Option D
Explaination / Solution:
The method in which male partner withdraws penis from vagina just before the ejaculation is called coitus interrupts. The meeting of ovum and sperm is avoided as sperms are not released.
