List of top Biology Questions

Which one of the following equations represents the Verhulst-Pearl Logistic Growth of population?
Silencing of specific mRNA is possible via RNAi because of:
Why can't insulin be given orally to diabetic patients?
Which of the following type of immunity is present at the time of birth and is a non-specific type of defence in the human body?
Role of the water vascular system in Echinoderms is:
A. Respiration and Locomotion
B. Excretion and Locomotion
C. Capture and transport of food
D. Digestion and Respiration
E. Digestion and Excretion
In bryophytes, the gemmae help in which one of the following:
Which one of the following is the characteristic feature of gymnosperms?
After maturation, in primary lymphoid organs, the lymphocytes migrate for interaction with antigens to secondary lymphoid organ(s)/tissue(s) like:
A. thymus
B. bone marrow
C. spleen
D. lymph nodes
E. Peyer's patches
In frog, the Renal portal system is a special venous connection that acts to link:
Which of the following is an example of a zygomorphic flower?
Match List - I with List - II
List IList II
A. HeartIII. Atrial natriuretic factor
B. KidneyI. Erythropoietin
C. Gastrointestinal TractIV. Secretnin
D. Adrenal CortexII. Aldosterone
Match List - I with List - II
List - IList - II
A. ProgesteroneIV. Corpus luteum
B. RelaxinII. Ovary
C. Melanocyte stimulating hormoneIII. Adrenal Medulla
D. CatecholaminesI. Pars intermedia

Assertion (A): Streptococcus pneumoniae and \(\textit{Haemophilus influenzae}\) are responsible for causing infectious disease in human beings. 
Reason (R): A healthy person acquires the infection by inhaling the aerosols released by an infected person.

If Meselson and Stahl’s experiment is continued for 80 minutes (till III generation), then what would be the ratio of DNA containing \( N^{15}/N^{15} : N^{15}/N^{14} : N^{14}/N^{14} \) in the medium?

Study the items of Column-I and those of Column-II:

Choose the option that correctly matches the items of Column-I with those of Column-II:

Which of the following features correctly show the mechanism of sex-determination in honey-bees?
(i) A zygote formed from the union of a sperm and an egg develops into a male.
(ii) Males have half the number of chromosomes as that of females.
(iii) The females are diploid having 32 chromosomes.
(iv) Males have a father and can produce sons.
Choose the correct option:
In molecular biology, who proposed that genetic information flows in one direction?

Which one of the following options shows the correct evolutionary order of the plants mentioned below?
(i) Fern
(ii) Ginkgo
(iii) Zostrophyllum
(iv) Gnetales

Some flowers are unisexual, this property of unisexuality of flowers prevents which kind of pollination?

Study the given pedigree chart in which neither of the parents shows the trait but the trait is present in both male and female children.

pedigree chart

Write about the trait, also explain the inheritance of such a trait in the progeny on the basis of the given pedigree chart.

Study the given pedigree chart in which neither of the parents shows the trait but the trait is present in both male and female children.

pedigree chart

Give one example of such a trait in human beings.

Describe any two situations where a medical doctor would recommend injection of pre-formed antibodies (antitoxins) into the body of a patient.
State the advantage of using thermostable DNA polymerase.
State the conclusions derived by David Tilman’s long-term ecosystem experiments using outdoor plots.
Explain how the intake of oral contraceptive pills prevent pregnancy in humans.