AIIMS Zoology Class 12 Questions

The 'cells of Rouget' are

Choose the correct statement.

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

The extinct human ancestor, who ate only fruits and hunted with stone weapons was

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.

Assertion: A male is found to be lacking facial hair and pubic hair. Reason: It is a case of hyposecretion of testosterone from Leydig's cells of testes.

Assertion: In jaundice, the skin and mucous membranes assume a yellowish hue. Reason: Yellow pigment bilirubin imparts pale yellow colour to blood plasma.

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 ? 1. Common cold - 2013 Droplet Infection. 2. Typhoid - 2013 Contaminated food & water. 3. AIDS - 2013 Shaking hands. 4. Ringworm - 2013 Using infected towels.

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?

In assisted reproductive technology where gametes have been fertilized in vitro, which of the following is practicable for embryo transplantation in Fallopian tube?

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?

Which of the following is correct regarding HIV, hepatitis B, gonorrhoea, trichomoniasis?

Assertion: Interferons are antiviral proteins. Reason: Interferons are secreted by virus infected cells.

Assertion: Parturition is induced by neural signal in maternal pituitary. Reason: At the end of gestation period, the maternal pituitary release prolactin which causes uterine contractions.

Assertion: Commelina shows cleistogamy. Reason: This reduces chances of inbreeding.

Assertion: All pathogens are parasites but all parasites are not pathogens. Reason: Majority of the parasites confer benefits to the host.

Homo erectus evolved during

Intermediate host is absent in the infection of

In humans at the end of first meiotic division, the male germ cells differentiate into the

Contraceptive oral pills help in birth control by

Upon fertilization, what structure develops from carpel?

Assertion: Restriction enzymes cut the strand of DNA to produce sticky ends. Reason: Stickiness of the ends facilitates the action of the enzyme DNA polymerase.

Assertion: Amniocentesis is a process of foetal sex determination. Reason: Metabolic errors and other diseases can be diagnosed prenatally by this process.

Assertion: Jave Ape-man, Peking man and Heidelberg man are the fossils of Homo erectus. Reason: Homo erectus evolved from Homo habilis.

Assertion: Mammalian ova produces hyaluronidase. Reason: The eggs of mammal are microlecithal and telolecithal.

Acrosome reaction in sperm is triggered by

Which of the following sets includes the bacterial disease?

The binding of antibodies to the antigens to produce a large insoluble complex is known as

How many sperms are formed from a secondary spermatocyte?

Which one of the following pairs of plant structures has haploid number of chromosomes?

Nicotiana sylvestris flowers only during long days and N. tabacum flowers only during short days. If raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be cross-fertilized to produce self-fertile offspring. What is the best reason for considering N. sylvestris and N. tabacum to be separate species?

In transgenics, expression of transgene in target tissue is determined by

Assertion: The primary protonema of moss by death and decay of cells may break into fragments. Reason: Each fragment gives rise to leafy gametophyte.

Assertion: Persons suffering from haemophilia fail to produce blood clotting factor VIII. Reason: Prothrombin producing platelets in such persons are found in very low concentration.