biology for grade 7

The functions performed by the circulatory system in all animals are 1) Transport of nutrients like glucose, amino acids, vitamins, minerals 2) Transport of oxygen from the organs of respiration to the body cells. 3) Transport of carbon dioxide from the body cells to the exterior. 4) Transportation..

The plasma b - cells produce a lot of anti-bodies, which circulate in the lymph. Each person can make 10 7 to 10 8 different kinds of antibody molecules so that there is an antibody for any antigen. The plasma membrane of each B cell should be sensitised by contact with a specific antigen..

1. Calcium is a component of calcium pectate, which is found in the middle lamella. 2. Acts as an activator of enzymes like ATP-ase, some kinases, phospholipases, a -amylase and succinate dehydrogenase. 3. Takes part in lipid metabolism. 4. Required in the maintenance of cell membrane. 5. Essential..

Flora and Fauna - Flora refers to plant species and fauna refers to animal species. The term biota includes both plant as well as the domesticated and wild species of animals. Our country has a rich diversity of flora and fauna. There are over 45,000 plant species and 81,251 animal species. It repr..

Humoral Immune System - The plasma b - cells produce a lot of anti-bodies, which circulate in the lymph. Each person can make 10 7 to 10 8 different kinds of antibody molecules so that there is an antibody for any antigen. The plasma membrane of each B cell should be sensitised by contact..

When the respiratory substrate is fat, the RQ is about 0.7. Example: Tripalmitin..

. The electrons of plastocyanin are picked by PS-I. Simultaneously, the pigment molecules of PS-I complex absorb solar radiation and transfer their absorbed electronic excitation (energy) to PS-I reaction centre - P 7 0 0 . P 7 0 0 gets excited and exudes an electron, which goes..

Wash the wound with carbolic soap, and clean water without delay soon after the bite. Apply an antiseptic and consult the doctor for anti rabies vaccine. Pet dogs or cats should be immunized by getting them vaccinated with anti-rabies vaccine. A rabid dog can be easily identified because it..

Accumulation of wastes due to its improper disposal is a major problem in our country. The recent Surat plague epidemic is an indication. Population in India has been growing at the rate of 1.7%. With this increase, there has also been an increase in the amount of wastes being produced es..

As a result of fertilisation, the following changes are observed in a flower: 1. A diploid zygote is formed and develops into an embryo which is the future plant. 2. The triploid endosperm tissue serves as a source of nutrition for the developing embryo. 3. The ovule becomes seed. 4. The ovary be..