STD 11 - 7. Structural organisation in animal — NEET STD 11 Science — Question

Which portion of the human respiratory system is called sound box?

Position of testis in Periplaneta americana

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 :-

Which of the following sequences is truly a systemic circulation pathway?

Assertion: Mother's milk is considered very essential for the newborn infant.
Reason: The yellowish fluid colostrum secreted by mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant.

Daily rythms are usually associated with

Constant body temperature is found in

Which one of the following characteristics is common both in humans and adult frogs?