STD 11 - 11. photosynthesis in higher plants — NEET STD 11 Science — Question

Which of the following statements are correct for Griffith experiments ?
(i) Frederick Griffith did experiments with Streptococcus pneumoniae.
(ii) Mice infected with the S strain die from pneumonia infection but mice infected with the R strain do not develop pneumonia.
(iii) Heat-killed S strain bacteria injected into mice did not kill them.
(iv) Mixture of heat-killed S and live R bacteria injected into mice then the mice died, and living S bacteria recovered from the dead mice.
(v) Some transforming principle' called genetic material transferred from the heat-killed S strain to R strain bacteria and enabled the R strain to become virulent.
(vi) The biochemical nature of genetic material was not defined from this experiments.

Which is false

Assertion: Each enzyme shows its highest activity at a particular temperature and pH called the optimum temperature and optimum pH.
Reason: Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat.

Choose correct sentence.

Assertion: The trichomes are unicellular elongations of the epidermal cells.
Reason: Trichomes helps in absorption of water and minerals from the soil.

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 one of the following is not a effect of gibberellin?

This is absent in monocot leaf