level of organisation in plant and animal

Acid rain chemically strips waterways of necessary nutrients and lowers the pH to levels where plants and animals cannot live. Most of the aquatic animals cannot survive when the pH is less than 4. Some species of fish, such as salmon, die even when the pH i..

Different types of tissue may together become organised into an organ for some specific function. E.g., a gland is an organ meant for secretion. In a gland there are four tissues - Epithelium (for secretion) Muscular tissue (for contraction of the gland) Connective tissue (for bi..

fig. 1.1 Levels of Organisation..

Terrestrial habitat Aquatic habitat Aerial habita..

Acidic water is dangerous to plants. Sulphuric and nitric acid rain washes nutrients out of the soil, damages the bark and leaves of trees and harms the fine root hairs of many plants which are needed to absorb water. Leaf pigments are decolorized because acid affects green pig..

Excretion in Plants - In plants, breakdown of substances is much slower than in animals. Hence accumulation of waste is much slower and there are no special organs of excretion. Green plants in darkness or plants that do not contain chlorophyll prod..

(sugarcane) 80 9. Ophioglossum (Adder’s tongue fern) 1262 In some cases, males have one chromosome less than females. In the round worm Coenorhabditis males and females have 11 and 12 chromosomes respectively. In the cockroach Blatta orientalis males and females have 23 and 24 chromosomes res..

A group of organs become organized into an organ system for coordinating a major function. Different organs in the digestive system carry out functions related to nutrition in an animal..

Globally sea levels have risen 4-8 inches over the last century. The high temperatures have already started melting polar ice caps sea icebergs and glaciers. This has released enormous amount of water. Warmer temperatures also heat water and make it expand; thus ocean levels ne..

The space between soil particles on the surface of earth is called pore space. This is of two types, micro pores and macro pores. Most of the water is held in the micro pores. These pores are available for plant roots Surface soil pore spaces are generally filled with air and water. W..