RE-NEET Zoology Questions

The opening between the right atrium and the right ventricle is guarded by ________.

The inactive form of Bt toxin is converted to the active form in the insect gut

Match List-I with List-II.

How many theca are present in each lobe of a typical bilobed angiosperm anther?

Which of the following hormone is not secreted by human placenta?

Sperm motility is due to

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: In an experiment, Mendel observed that the F₁ progeny plants are all tall and none are dwarf. Reason R: Stem height is a contrasting trait, with tall being dominant and dwarf being recessive. In the light of the above statements, choose the most appropriate answer from the options given below:

During PCR, primers bind to the DNA strands in the ______ step.

Which of the following plant produces non-albuminous seeds?

For a person with blood group ‘O’, which of the following is not a possible combination of parents’ blood group genotypes?

Which of the following is used as a clot buster?

Arrange the following in descending order of number of species in the Amazonian rain forest. (a) Plants (b) Birds (c) Fishes (d) Invertebrates (e) Mammals

Given below are two statements : Statement I : Plasmids are autonomously replicating DNA. Statement II : Plasmids are extrachromosomal DNA. In the light of the above statements, choose the most appropriate 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 : Forelimbs of human and bats are homologous. Reason R : Forelimbs of humans and bats have similar anatomical structure. In the light of the above statements, choose the most appropriate answer from the options given below :

Which of the following statements about the reabsorption process in Henle’s loop are correct ? (a) The descending limb of Henle’s loop is permeable to water but almost impermeable to electrolytes. (b) Urine gets concentrated in Henle’s loop. (c) Reabsorption of Na⁺ and water takes place in Henle’s loop. (d) Active or passive transport of electrolytes occurs in the ascending limb of Henle’s loop.

Which of the following are secondary lymphoid organs ? (a) Bone marrow (b) Tonsils (c) Spleen (d) Thymus

Which of the following is the correct order of arrangement of vertebrate column from the head to toe ?

If the diploid chromosome number of a typical angiosperm is 36, what would be the chromosome number in its endosperm?

Sponges exchange O₂ with CO₂ by

Which of the following disease is not sexually transmitted?

Which of the following in female gametophyte of an angiosperm helps in guiding the pollen tube for fertilizing the eggs?

Match List-I with List-II.

The covering of ovum at ovulation is

Match List-I with List-II.

Which of the following structure is not a part of the male reproductive system?

Which of the following are primary consumers in a food chain?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Abingdon tortoise in Galapagos islands became extinct within a decade after goats were introduced. Reason R: Goats were more efficient at browsing than Abingdon tortoise. In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following statements about lac-operon is correct?

Which of the following statements is correct about Plasmodium?

A population of diploid organisms is in Hardy-Weinberg equilibrium. If the frequency of allele A is 0.1, the frequency of AA is

Adaptive radiation in placental mammals and Australian Marsupials, leading to similarity between distant species is an example of

Colostrum, secreted by mother during initial days of lactation, is abundant in

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: In recombinant DNA technology, lysozyme is used for disrupting bacterial cells while cellulase is for plant cells. Reason R: Isolation of genetic material needs disruption of cells. In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements: Statement I: Ovulation is caused by LH surge leading to rupture of Graafian follicles. Statement II: Graafian follicle remaining after ovulation transform into corpus luteum and secretes large amount of estrogen. In the light of the above statements, choose the most appropriate answer from the options given below:

Natural selection can lead to _________. Choose the correct answer from the options given below:

The method of directly injecting a sperm into ovum in assisted reproductive technology is called:

Which of the following is used as an effective sedative and painkiller for treating post-surgery patients?

Given below are two statements: Statement I: Down's syndrome is caused by the absence of one of the X⁻chromosomes. Statement II: Turner's syndrome is caused by the presence of an additional copy of the chromosomes. In the light of the above statements, choose the correct answer from the options given below:

Which of the following is not evidence for evolution?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The logistic growth model of populations is considered more realistic than the exponential growth model. Reason R: Resources are finite. In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements: Statement I: Modern Homo sapiens arose in Australia and moved across continents. Statement II: Homo sapiens arose around 75000 to 100000 years ago. In the light of the above statements, choose the most appropriate answer from the options given below:

Consider a population of 10 million cells. Given the per-capita birth rate of 0.002 (per unit time) and the per-capita death rate of 0.002 (per unit time), the expected number of cells after 10 generations is:

Which of the following statements are correct? (a) Energy flow from producers to consumers is unidirectional (b) Energy pyramid can never be inverted (c) Transfer of energy follows the 10% law Choose the correct answer from the options given below:

Muscle contraction is initiated by a signal sent by the central nervous system by the release of ______.

Which of the following enzymes synthesizes precursor mRNA?

Match List-I with List-II:

Match List-I with List-II:

Following are the steps involved in action of toxin in Bt. Cotton A. The inactive toxin converted into active form due to alkaline pH of gut of insect. B. Bacillus thuringiensis produce crystals with toxic insecticidal proteins. C. The alkaline pH solubilises the crystals. D. The activated toxin binds to the surface of midgut cells, creates pores and causes death of the insect. E. The toxin proteins exist as inactive protoxins in bacteria.

Match List-I with List-II:

Which evolutionary phenomenon is depicted by the sketch given in figure?