AIIMS Zoology Class 12 Questions

Chimeric DNA is

Virus free plants can be generated through-

What are the requirements in tissue culture

In Ti⁻plasmid, which of the following is removed:

Assertion: Somaclonal variations produce slight differences in plant Reason: In bacteria, transcription and translation occurs in cytoplasm

Choose the correct option

Acquired Immunity mediated by which of the following

Choose the correct statement

Choose the correct one

A group of individuals resembling each other in morphological, physiological, biochemical and behavioral characters constitute a species. Such individuals can breed among themselves but cannot breed with members other than their own to produce fertile offspring. New species are formed mainly due to reproductive isolation.

Activity of phagocytosis occurs through

The assertion statement is true that ‘small particulate matter of size 2.5μm or less is harmful for health. The reason statement is also true that ‘nasal cavity and throat filters most of the large particles’, but it is not the correct explanation for assertion.

The assertion statement is true that ‘Baculovirus can be used to control the population of nucleopolyhedrovirus, but the reason saying that ‘they are effective against plant pathogens’ is not the correct explanation for assertion.

The statement given in both assertion and reason are wrong. Selaginella and Salvinia do not produce spores that cannot be differentiated by sex.

The process of gene cloning becomes possible with the help of recombinant DNA technology. It is a process in which isolation and insertion of gene of interest is carried out in different organisms.

Assertion: Coacervates are believed to be the precursors of life. Reason: Coacervates are self-duplicating aggregates of protein surrounded by lipid molecules.

The statement given in the assertion is known to be true as deficiency of iron causes abnormality in the menstrual cycle. The statement given in the reason is known to be false because the levels of estrogen and progesterone do not become low.

The scurvy is not caused by the deficiency of an element, as it is caused by the deficiency of vitamin C. Also, the statement given in the reason that, ‘daily requirement of ascorbic acid is 5 mg/day is incorrect. It is 90 mg in adult males and 75 mg in adult females.

The process of delivery of foetus (childbirth) is called parturition. Parturition is induced by a complex neuroendocrine mechanism. The signals for parturition originate from the fully developed foetus and the placenta which induces mild uterine contractions called foetal ejection reflex. This triggers release of oxytocin from the maternal pituitary. Oxytocin acts on the uterine muscles and causes stronger uterine contractions which in turn stimulate further secretion of oxytocin.

Assertion: DNA fingerprinting is applied in paternity testing in case of disputes. Reason: It employs the principle of polymorphism in DNA sequences as the polymorphisms are inheritable from parent to children.

In IVF method, popularly known as test tube baby programme, ova from the wife/donor (female) and sperms from the husband/donor (male) are collected and introduced to form zygote under simulated conditions in the laboratory. The zygote or early embryos (with upto 8 blastomeres) could be transferred into the fallopian tube (ZIFT) and embryos with more than 8 blastomeres into the uterus (IUT). This is in vitro fertilization (IVF⁻fertilisation outside the body in the almost similar condition as that in the body) followed by embryo transfer (ET).

Choose the statement.

Correct hormonal sequence in the case of menstruation as

The first clinical gene therapy was given for treating

Biolistic (gene gun) is suitable for

Which of the following is the relatively most accurate method for dating fossils?

Short-lived immunity acquired from mother to foetus placenta or through mother’s milk to the infant is categorized as

Wings a pigeon, bat and mosquito shows

The 'cells of Rouget' are

Choose the correct statement.

Apiculture is associated with which of the following groups of plants?

RNA interference is essential for the

Assertion: Filarial worm is transmitted to humans by Culex mosquito. Reason: Culex prefers to breed in fresh water.

Assertion: AIDS is caused by the HIV, a retrovirus. Reason: Retroviruses have RNA genome.

What is the source of Eco R I?

First clinical gene therapy was given in 1992 to a 4 years old girl for

Which of the following statements is correct?

Which of the following statements is correct?

Which of the following evidences does not favour the Lamarckian concept of inheritance of acquired characters?

Assertion : Now-a-days amniocentesis is banned. Reason : Amniocentesis gives the information of any abnormality in the foetus and many other complications regarding pregnancy can be detected.

Assertion : A gene from Bacillus thuringiensis is incorporated in plant genome to increase their yield. Reason : Bacillus thuringiensis has Bt toxin producing gene, which kills the larva of insects.

Assertion : Corpus luteum is produced by Graafian follicle after ovulation. Reason : It secretes estrogen which is necessary to maintain pregnancy.

Assertion : Sporozoites of malarial parasite enter in the human body due to biting of freshly born female Anopheles mosquito, whose mother was a carrier of malarial parasite. Reason : Male and female gametocytes of malarial parasites are formed in the human intestine.

Which one is correct?

CD^{-4} receptor is associated with

What do A, B, C and D represent?

Which animal has the longest gestation period?

What is a plasmid?

The concept of chemical evolution is based on

Recombinant DNA technology involves several steps in which initial step is of isolation of the DNA. Which enzymes are used in the process for the break down of fungal cell, plant cell and bacterial cell respectively?