STD 12 - 3. reproductive health — NEET STD 11 Science — Question

Fresh water bony fishes maintain water balance by

Which of the following statements are correct for fertilization ?
(i) The motile sperms swim rapidly enter into the uterus after insemination and finally reach fallopian tube.
(ii) Fertilisation only occurs at the ampullary - isthmic junction.
(iii) During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of additional sperms.
(iv) The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum and induce the completion of the meiotic division of the secondary oocyte.
(v) Scientifically it is correct to say that the sex of the baby is determined by the father and not by the mother.

The part of nephron involved in active reabsoprtion of sodium is

Dominant allele are expressed in

Caffeine, amphetamines and cocaine are

Which statements are incorrect for epithelium from given statement ?
(i) The cells are compactly packed with little intercellular matrix.
(ii) There are two types of epithelial tissues namely simple epithelium and compound epithelium.
(iii) Simple epithelium is composed of a single layer of cells and has protective function as it does in our skin.
(iv) The compound epithelium consists of two or more cell layers and functions as a lining for body cavities, ducts and tubes.
(v) The squamous epithelium is made of a single thin layer of flattened cells with irregular boundaries.

There is a membrane covering the lungs, called

Physical barrier = .............. and physiological barrier = .............

Certain characteristic demographic features of developing countries are