List of top Biology Questions

Sex in human embryos is determined by:

In humans, mammary glands are divided into ___ lobes:

Primary Endosperm Nucleus is the product of:

Match List-I with List-II:

List-I (Structures)	List-II (Functions)
(A) Filiform apparatus	(III) Guides pollen tube into the synergid
(B) Tapetum	(IV) Nourishes the pollen grain
(C) Exine	(I) Made up of sporopollenin
(D) Funicle	(II) Attachment of ovule to the placenta

Choose the correct answer from the options given below:

Cells present in the mature pollen grains are___:

Match List-I with List-II:

List-I (Concepts)	List-II (Explanation)
(A) Standing state	(IV) Amount of mineral nutrients in the soil at a given time
(B) Secondary productivity	(II) Rate of formation of organic matter by consumers
(C) Standing crop	(III) Mass of living matter in a trophic level at a given time
(D) Net primary productivity	(I) Available biomass for the consumption of heterotrophs

Choose the correct answer from the options given below:

Choose the correct statements with respect to decomposition from the following:
(A) Decomposition is an anaerobic process.
(B) Decomposition rate of detritus depends upon the chemical nature of it.
(C) Water-soluble organic nutrients go into the soil and get precipitated in the process of leaching.
(D) Humification follows mineralisation.
Choose the correct answer from the options given below:

In which ecosystem is the biomass of primary consumers greater than producers?

The process of mineralization by microorganisms helps in the release of:

Two closely related species can co-exist indefinitely and violate Gause’s ‘Competitive Exclusion Principle’ by:

In a country, at any time, the population has the same number of young and mature ones. What type of growth does it reflect?

Match List-I with List-II:

List-I Interspecies Relationships	List-II Features
(A) Commensalism	(IV) One species benefits and other remains unaffected
(B) Mutualism	(III) Both the species are benefitted
(C) Amensalism	(II) One species is harmed and the other is unaffected
(D) Parasitism	(I) One species is benefitted at the expense of the other

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When an insect feeds on the Bt plant, the insect dies due to the conversion of inactive protein to active protein in:

Expand "GEAC":

Which of the following statements are true?
(A) Milk obtained from ‘Rosie’ is nutritionally more balanced for human babies than natural human milk.
(B) Biopiracy refers to the use of bioresources without proper authorization from MNCs.
(C) GEAC is the decisive body for safety and validity of GMOs and GM research respectively.
(D) Transgenic animals help us to understand the contribution of genes in the development of disease.
Choose the correct answer from the options given below:

Which of the following statements are incorrect?
(A) Fragments of DNA can be separated by ELISA.
(B) Transformation is a procedure through which a piece of DNA is introduced in a host bacterium.
(C) Recombinant DNA technology does not involve isolation of a desired DNA fragment.
(D) DNA ligases are used for stitching DNA fragments into a vector.
Choose the answer from the options given below:

Arrange the following steps involved in the transformation of bacteria in a sequence from initiation to end.
(A) Incubation of rDNA with bacterial cell on ice
(B) Treatment with divalent cations
(C) Heat shock treatment
(D) Selection on antibiotic containing agar plate
(E) Placed them again on ice
Choose the correct answer from the options given below:

Which of the following is not the correctly matched pair of organism and its respective cell wall degrading enzyme?

Downstream processing method involves:

The beetle used as a biocontrol agent for aphids and mosquitoes is:

Match List-I with List-II:

List-I Products	List-II Organisms
(A) Statin	(III) Monascus
(B) Clot buster	(I) Streptococcus
(C) Swiss cheese	(IV) Propionibacterium
(D) Cyclosporin-A	(II) Trichoderma

Choose the correct answer from the options given below:

Antibodies are secreted by:

Match List-I with List-II:

List-I Types of barriers	List-II Examples
(A) Cytokine barriers	(IV) Interferons
(B) Physical barriers	(I) Mucus coating
(C) Cellular barriers	(III) Phagocytosis
(D) Physiological barriers	(II) Tears from eyes

Choose the correct answer from the options given below:

Identify the incorrect statement/s:
(A) Intestinal perforation and death may occur in severe cases of typhoid infection.
(B) Common cold is caused by Rhinoviruses.
(C) Lips and fingernails may turn grey to bluish colour in severe cases of pneumonia.
(D) Pneumonia is caused by Salmonella.
(E) Typhoid fever could be confirmed by Widal test.
Choose the correct answer from the options given below:

In sewage treatment, flocs are: