STD 11 - 4. Animal kingdom — NEET STD 11 Science — Question

Fill in the blanks.
(i) Cancer causing agents are called A and cancer causing viruses are called B which have genes called C.
(ii) D or E genes present in normal cells when activated under certain conditions lead to oncogenic transformation of cells.
(iii) In treatment of cancer, patients are given substances called biological response modifier such as F which activates their immune system & helps in destroying tumor.
(iv) Heroin commonly called G is chemically H which is obtained from morphine by I reaction and is extracted from latex of poppy plant J (Scientific name).
(v) Cannabinoids are obtained from the infloroscence of the plant K. They are known for their effects on L system of body.
(vi) Cocaine is obtanied from coca plant M native to N. It interferes with transport of neuro- transmitter O.
(vii) Morphine is very effective P and Q and is very useful in patients who have undergone surgery.
(viii) R is a chemical substance in tobacco that stimulates adrenal gland to release adrenaline and nor-adrenaline into blood.
(ix) Adolescence means both S and T during which a child becomes mature. The period between U and V years of age is adolescence period.
(x) Dependence is the tendency of the body to manifest a characteristic and unpleasant W syndrome.
(xi) Excessive doses of drugs may lead to coma and death due to respiratory failure, heart failure or X.
(xii) The chronic use of drugs and alcohol damages nervous system and Y.
(xiii) The damage to liver due to excessive use of drugs and alcohol is called Z.
choose the correct option given below :-

Petromyzon is a connecting link between

Read the following
(i) Grasshopper is an example of XO type of sex determination in which males have only X- chromosome besides autosomes, whereas female have a pair of X-chromosome.
(ii) In mammals including man, XY type of sex determination is seen where both male and female have same number of chromosome.
(iii) The XO and XY sex determination mechanism are designated to be example of female heterogamety whereas ZW sex determination mechanism are designated to be example of male heterogamety.
(iv) In birds the female have zw chromosome whereas males have zz chromosome besides autosomes.
(v) The mutation arising due to change in a single base of DNA is known as point mutation.
(vi) The chemical and physical factors that induce mutation are reffered to as mutagens.
(vii) An analysis of traits in a several generation of a family is called pedigree analysis.
(viii) In pedigree analysis the symbol represents affected individuals and the symbol represents consanguineous mating.
(ix) Sickle-cell anaemia and phenylketonuria are example of X-linked recessive trait.
(x) Myotonic dystrophy is example of autosomal recessive trait.
(xi) Haemophilia is sex-linked recessive disease in which heterozygous female may transmit the diseases to sons.
choose the option with incorrect statements :-

Unstriated muscles are found in

Myasthenia gravis is due to

The medulla contains centres which control

Delete odd one for frog.

Which set of terms would most likely be used in a description of the nervous system of chordates?