STD 12 - 12. ecosystem — NEET STD 11 Science — Question

Deposition of new materials inside the cell wall of cells starts in

The germ theory of disease was put forward by:

Read the following and choose the option with all incorrect statements.
(A) The outer walls of guard cells are thick and the inner walls are highly thickened.
(B) The stomatal aperture, guard cells and the surroundings subsidiary cells are together called stomatal apparatus.
(C) Endodermal hairs on the stem are called trichomes.
(D) All tissues except epidermis and vascular bundles constitute the ground tissues.
(E) In leaves, the ground tissue consists of thick- walled chloroplast containing cells and is called mesophyll.
(F) The xylem and phloem together constitute vascular bundles.
(G) Vascular bundles having close vascular bundles that possess the ability to form secondary xylem and phloem.
(H) In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissue they are referred as closed.
(I) In conjoint type of vascular bundles, the xylem. and phloem are situated at the same radius of vascular bundles.
(J) The conjoint vascular bundles usually have the phloem located only on the inner side of xylem.
(K) Endodermis is a multiple layers of barrel- shaped cells without any intercellular spaces in cortex in roots.
(L) The tangential as well as radial walls of the endodermal cells in cortex have a deposition of water impermeable, waxy material suberin in the form of casparian strips.
(M) The parenchymatous cells which lie between the xylem and phloem are called conjuctive tissue.

Which of the following plants produces seeds but not flowers ?

Identify correct pair :

Which one of the following statement is not true regarding gel electrophoresis technique?

In angiosperm, archesporium gives rise to:

Identify structure of amino acid.

Which of the following components of plasma membrane facilitated the process of cell recognition and cell adhesion?