Zoology MCQs for NEET — Practice Questions with Answers

The text states: 'He also concluded, based on his studies on plant tissues, that the presence of cell wall is a unique character of the plant cells. On the basis of this, Schwann proposed the hypothesis that the bodies of animals and plants are composed of cells and products of cells. Schleiden and Schwann together formulated the cell theory.'

The NCERT text specifies: 'Most prokaryotic cells, particularly the bacterial cells, have a chemically complex cell envelope. The cell envelope consists of a tightly bound three layered structure i.e., the outermost glycocalyx followed by the cell wall and then the plasma membrane.' This indicates the cell wall is outside the plasma membrane, but beneath the glycocalyx if present.

The text mentions: 'All prokaryotes have a cell wall surrounding the cell membrane except in mycoplasma.'

The NCERT text states: 'The cell envelope consists of a tightly bound three layered structure i.e., the outermost glycocalyx followed by the cell wall and then the plasma membrane.'

The text says: 'The cell wall of a young plant cell, the primary wall is capable of growth, which gradually diminishes as the cell matures and the secondary wall is formed on the inner (towards membrane) side of the cell.'

The NCERT text explains: 'Bacteria can be classified into two groups on the basis of the differences in the cell envelopes and the manner in which they respond to the staining procedure developed by Gram viz., those that take up the gram stain are Gram positive and the others that do not are called Gram negative bacteria.'

The NCERT text states, 'hCG, hPL and relaxin are produced in women only during pregnancy.' It also mentions that 'estrogens, progestogens, cortisol, prolactin, thyroxine, etc., are increased several-folds in the maternal blood' during pregnancy, implying progestogens are present even when not pregnant, albeit at lower levels.

According to the NCERT text, 'In human beings, after one month of pregnancy, the embryo’s heart is formed. The first sign of growing foetus may be noticed by listening to the heart sound carefully through the stethoscope.'

The NCERT states, 'After implantation, finger-like projections appear on the trophoblast called chorionic villi which are surrounded by the uterine tissue and maternal blood.'

The NCERT text specifies, 'The placenta is connected to the embryo through an umbilical cord which helps in the transport of substances to and from the embryo.' This implies both supply of nutrients/oxygen and removal of waste.