STD 11 - 19. Chemical coordination and integration — NEET STD 11 Science — Question

Bilateral symmetry, blastopore mouth and true coelom occur in

Branching descent is one of the key concepts of

The narrowest and most numerous tubes of lungs are termed as

A malfunction of the lymph nodes would most likely interfere with the

Paramecium moves about by

Which one of the following statement are correct.
(i) Mendel's experiments had small sample size which gave greater credibility to the data.
(ii) A true breeding line shows a stable trait inheritance and expression for several generations.
(iii) A recessive parental trait is expressed only in its heterozygous condition.
(iv) Failure of segregation of chromatids during cell division results in aneuploidy.
(v) Chromosomal disorders are mainly determined by alteration or mutation in a single gene.
(vi) Thalasemia and cystic fibrosis are Mendelian disorders.
(vii) Sickle cell anemia is an X-linked trait.
(viii) Incomplete or mosaic inheritance is an example of pre-Mendelian concept of blending inheritance.
(ix) Test cross is a special type of back cross.
(x) Chromosomal aberrations are commonly observed in cancer cells.

Respiratory organs in aquatic arthropods like cray fish, prawn and molluscs like Unio are

Which of the following option regarding given statements is correct ?
(i) In fishes single circulation present.
(ii) In fishes the heart pumps out deoxygenated blood which is oxygenated by the gills.
(iii) In amphibians and reptiles incomplete double circulation present.
(iv) In amphibians and reptiles, oxygenated blood and the deoxygenated blood get mixed up in the single ventricle which pumps out mixed blood.
(v) In birds and mammals two separate circulatory pathways are present in these organisms, hence, these animals have double circulation.
(vi) In heart of fish deoxygenated blood present.