Question

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Answer 1

Answer:

1. tissues

2.stomata

3. I don't know

photosynthesis :- oxygen

cascuta:-parasite

lichens:- symbosis

ans6:- The cell theory describes the basic properties of all cells.

The three scientists that contributed to the development of cell theory are Matthias Schleiden, Theodor Schwann, and Rudolf Virchow.

ans7:-AIM

To prepare stained temporary mount of onion peel cells and to record observations and draw labelled diagrams.

MATERIALS REQUIRED

Onion, plain slides, coverslip, watch glass, needles, forceps, brush, blade, safranin, blotting paper, glycerine and compound microscope.

THEORY

Onion is a multicellular plant. Like other plant cells, the cell of onion peel consists of a cell wall, cell membrane, cytoplasm, a large vacuole and a nucleus. The nucleus lies at the periphery of cytoplasm and vacuole is located in the centre. Presence of large vacuoles and cell wall confirms that cells of onion peel are plant cells.PROCEDURE

Take a piece of onion and bend it to remove the transparent membranous structure called onion epidermal peel. With help of forcep remove the peel from its inner side.

Place7 the peel in water in a watch glass.

Add a few drops of stain safranin, to the watch glass containing the peel for staining.

Now, wash the leaf peel with water and transfer it on to a clean slide with the help of brush.

Remove extra water from the slide surrounding the peel with the help of blotting paper.

To this slide, add a drop of glycerine over the peel and place the coverslip in a manner to avoid entry of air bubbles.

Soak away the extra glycerine with blotting paper

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ans8 :- Biodiversity is the biological variety and variability of life on Earth. Biodiversity is a measure of variation at the genetic, species, and ecosystem level. Terrestrial biodiversity is usually greater near the equator, which is the result of the warm climate and high primary productivity.

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