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2021-08-17 19:43:21 Cytokinins (Phytokinins):
(i) Cytokinins are plant growth hormones which are basic in nature, either aminopurine or phenyl urea derivatives that promote cell division (cytokinesis) either alone or in conjugation with auxin.

(ii) Functions of cytokinins

(a) Cell division: Cytokinins are essential for cytokinesis and thus promote cell division. In presence of auxin, cytokinins stimulate cell division even in non-meristematic tissues.

(b) Cell enlargement and Differentiation: Under some conditions cytokinins enhance the expansion of leaf cells in leaf discs and cotyledons. These cells considered to be mature and under normal conditions do not expand.

(c) Delay in senescence: Cytokinin delay the senescence (ageing) of leaves and other organs by controlling protein synthesis and mobilization of resources (Disappearance of chlorophyll). It is called Richmond Lang effect.

(d) Counteraction of apical dominance: Auxins and cytokinins act antagonistically in the control of apical dominance. Auxins are responsible for stimulating growth of apical bud.

(e) Breaking of dormancy: Cytokinins breaks seeds dormancy of various types and thus help in their germination.

(f) Accumulation and Translocation of solutes Open / Comment

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2021-08-17 15:42:09 *#Some_Important_Questions#*

* CELL *

The word cell came from the latin word.
* Ans: Cellula*

All living organisms are made up of
* Ans: Cell*

Study of cell - *Cytology*

Study of tissue - *Histology*

The physical unit of life
* Ans: Protoplasm*

Who invented the cell?
* Ans: Robert Hook in 1665*

Cell theory was proposed by?
* Ans: M.J. Schleiden and Theodor Schwann (1839)*

Scientist who observed cork cells under a microscope?
* Ans: Robert Hook*

Plant cell was discovered by?
* Ans: Robert Hook*

The term protoplasm was coined by 3.E. Purkinje Scientist who called protoplasm as the physical basis of life T.H. Huxley

Largest cell
* Ans: Ostrich's egg*

Smallest cell?
* Ans: Mycoplasma*

Organisms known as pleuro pneumonia like organism (PPLO)?
* Ans: Mycoplasma*

Smallest cell in the human body?
* Ans: Sperm*

Largest cell in human body?
* Ans: Ovum*

Longest cell in human body?
* Ans: Neuron*

Power house of a cell?
* Ans: Mitochondria*

Brain of the cell?
* Ans: Nucleus*

Kitchen of the cell?
* Ans: Chloroplast*

Energy Currency of the cell?
* Ans: ATP*

Suicidal bag?
* Ans: Lysosomes*

Traffic Police of the cell?
* Ans: Golgibodies*

Skeletal system of the cell?
* Ans: Endoplasmic reticulum*

The cell having most life span in human body?
* Ans: RBC*

Cytoplasm and Nucleus are included in?
* Ans: Protoplasm*

The cell organelle known as protein factory?
* Ans: Ribosome*

The organelle in the site of protein synthesis?
* Ans: Ribosome*

Ribosome has its own?
* Ans: RNA*

Two types of acids present in cell?
* Ans: DNA and RNA*

The basic unit of chromosome?
* Ans: DNA*

The functional unit of DNA?
* Ans: Genes*

Function of DNA?
* Ans: Transmission of hereditary traits*

Function of RNA?
* Ans: Protein synthesis*

Each chromosome has?
* Ans: A pair of DNA*

DNA sugar is called?
* Ans: Deoxyribose*

The nitrogen bases in DNA?
* Ans: Adenine, Guanine, Thymine, Cytosine*

The RNA sugar?
* Ans: Ribose*

The nitrogen bases in RNA?
* Ans : Adenine, Uracil, Cytosine and Guanine*

The double helical model of DNA was discovered by?
* Ans: James Watson and Francis Crick*

The enzyme present in lysosome?
* Ans: Hydrolytic enzyme*

Lysosome was discovered by?
* Ans: Christion de Duve (1955)*

Compounds enter the cell through?
* Ans: Endoplasmic reticulum*

The cell organelle which is the sites of energy transfer in living cell?
* Ans: Mitochondria*

The functions of mitochondria?
* Ans: Cellular respiration, ATP production*

The stage of cellular respiration which does not need oxygen?
* Ans: Glycolysis*

The term Mitochondria was coined by?
* Ans: Carl Benda (1898)*

Name the process in which the main product is energy?
* Ans: Cellular respiration*

In mitochondria the energy is formed in the form of?
* Ans: ATP molecules*

Which molecule is known as the energy currency?
* Ans : ATP molecule*

ATP?
* Ans: Adenosine Triphosphate*

The cell that lacks mitochondria and nucleus?
* Ans: RBC*

Number of ATP molecule that will get from one molecule of glucose?
* Ans: 38ATP*

The elements in the component of ATP?
* Ans: Nitrogen and phosphorus*

Kerb's cycle is related to?
* Ans: Cellular respiration*

Cell respiration was discovered by?
* Ans: Adolf Krebs*

The whole process of a cell is controlled by?
* Ans: Nucleus*

The cell without nucleus?
* Ans: Prokaryotic cell*

The cell with nucleus?
* Ans : Eukaryotic cell*

Nucleus was discovered by?
* Ans : Robert Brown*

Name the process in which lysosome digest its own cell organelles?
* Ans: Autoplagy*

A network like structure inside the nucleus is called?
* Ans: Chromatin Reticulum*

The structure of cell is first explained in the book of?
* Ans: Micrographia*

The living thing which do not obey cell theory?
* Ans: Virus*

The scientist first studied about all structure and cell reaction?
* Ans: Theodor Schwaan*

Schwaan cell are seen in?
* Ans: Nerve cell* Open / Comment