List of top Biology Questions asked in NEET (UG)

Given below are two statements :
Statement I : In the nephron, the descending limb of loop of Henle is impermeable to water and permeable to electrolytes.
Statement II : The proximal convoluted tubule is lined by simple columnar brush border epithelium and increases the surface area for reabsorption.
In the light of the above statements, choose the correct answer from the option given below :

Given below are two statements:
Statement I: In C₃ plants, some O₂ binds to RuBisCO, hence CO, fixation is decreased.
Statement II: In C₄ plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration.
In the light of the above statements, choose the correct answer from the options given below:

Match List I with List II:

List I		List II
A	Mesozoic Era	I	Lower invertebrates
B	Proterozoic Era	II	Fish & Amphibia
C	Cenozoic Era	III	Birds & Reptiles
D	Paleozoic Era	IV	Mammals

Choose the correct answer from the options given below:

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : FSH acts upon ovarian follicles in female and Leydig cells in male.
Reason R : Growing ovarian follicles secrete estrogen in female while interstitial cells secrete androgen in male human being.
In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements:
Statement I: Mitochondria and chloroplasts both double membranes bound organelles. 
Statement II: Inner membrane of mitochondria is relatively less permeable, as compared chloroplast. I
In the light of the above statements, choose the mis appropriate answer from the options given below

Match List I with List II:

List I		List II
A	Exophthalmic goiter	I	Excess secretion of cortisol, moon face & hypergylcemia
B	Acromegaly	II	Hypo-secretion of thyroid hormone and stunted growth.
C	Cushing’s syndrome	III	Hyper secretion of thyroid hormone & protruding eye balls.
D	Cretinism	IV	Excessive secretion of growth hormone.

Choose the correct answer from the options given below:

Match List I with List II:

List I		List II
A	Two or more alternative forms of a gene	I	Back cross
B	Cross of F1 progeny with homozygous recessive parent	II	Ploidy
C	Cross of F progeny with any of the parents	III	Allele
D	Number of chromosome sets in plant	IV	Test cross

Choose the correct answer from the options given below:

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : Breast-feeding during initial period of infant growth is recommended by doctors for bringing a healthy baby.
Reason R : Colostrum contains several antibodies absolutely essential to develop resistance for the new born baby.
In the light of the above statements, choose the most appropriate answer from the options given below :

Following are the stages of pathway for conduction of an action potential through the heart
A. AV bundle 
B. Purkinje fibres 
C. AV node 
D. Bundle branches 
E. SA node
Choose the correct sequence of pathway from the options given below

Identify the set of correct statement:
A. The flowers of Vallisneria are colourful and produce nectar. 
B. The flowers of waterlily are not pollinated by water. 
C. In most of water-pollinated species, the pollen grains are protected from wetting. 
D. Pollen grains of some hydrophytes are long and ribbon like. 
E. In some hydrophytes, the pollen grains are carried passively inside water. 
Choose the correct answer from the options given below

Following are the stages of cell division :
A. Gap 2 phase
B. Cytokinesis
C. Synthesis phase
D. Karyokinesis
E. Gap 1 phase
Choose the correct sequence of stages from the options given below

Which of the following statement is correct regarding the process of replication in E.coli?

Given below are two statements:
Statement I : Bt toxins are insect group specific and coded by a gene cry IAc. 
Statement II : Bt toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic pH of the insect gut. 
In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements:
Statement I : Chromosomes become gradually visible under light microscope during leptotene stage.
Statement II : The begining of diplotene stage is recognized by dissolution of synaptonemal complex.
In the light of the above statements, choose the correct answer from the options given below:

Match List I with List II

	List-I		List-II
A	Rhizopus	I	Mushroom
B	Ustilago	II	Smut fungus
C	Puccinia	III	Bread mould
D	Agaricus	IV	Rust fungus

Choose the correct answer from the options given below

Which of the following are fused in somatic hybridization involving two varieties of plants?

In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100x (kcal m^-2)yr^-1, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?

In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?

Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate.

Which one of the following can be explained on the basis of Mendel’s Law of Dominance?
A. Out of one pair of factors one is dominant and the other is recessive.
B. Alleles do not show any expression and both the characters appear as such in F₂ generation.
C. Factors occur in pairs in normal diploid plants.
D. The discrete unit controlling a particular character is called factor.
E. The expression of only one of the parental characters is found in a monohybrid cross.
Choose the correct answer from the options given below:

Identify the part of the seed from the given figure which is destined to form root when the seed germinates.

Read the following statements and choose the set of correct statements:
In the members of Phaeophyceae,
A. Asexual reproduction occurs usually by biflagellate zoospores.
B. Sexual reproduction is by oogamous method only.
C. Stored food is in the form of carbohydrates which is either mannitol or laminarin.
D. The major pigments found are chlorophyll a, c and carotenoids and xanthophyll.
E. Vegetative cells have a cellulosic wall, usually covered on the outside by gelatinous coating of algin.
Choose the correct answer from the options given below:

Auxin is used by gardener to prepare weed-free lawns. But no damage is caused to grass as auxin

Match List I with List II

List I		List II
A	Lipase	I	Peptide bond
B	Nuclease	II	Ester bond
C	Protease	III	Glycosidic bond
D	Amylase	IV	Phosphodiester bond

Choose the correct answer from the options given below:

Given below are two statements:
Statement I: The presence or absence of hymen is not a reliable indicator of virginity.
Statement II: The hymen is torn during the first coitus only.
In the light of the above statements, choose the correct answer from the options given below: