Biology Tutors for Class 9 - 10 in Delhi

Ostia are the various openings on the body of a sponge

Insects sits on flower to suck nectar and for laying eggs. At that time pollen sticks to their body parts. Sticky nature makes it feasible for pollen grains to get attached to the insect body and get cross pollinated to another flower of same plant or different plant of same species.

The nucleus maintains the integrity of genes and controls the activities of the cell by regulating gene expression-the nucleus is, therefore, the control center of the cell.... Movement of large molecules such as proteins and RNA through the pores is required for both gene expression and the maintenance of chromosomes.

Mechanism of transport of materials in plant:- in some steps

1) Roots absorb water and dissolved minerals from the soil.

2) Water and minerals are transported upward from roots to shoot as xylem sap.

3) Transpiration ( the loss of water through stomata ) creates a force within leaves that pulls xylem sap upward.

4) Through stomata, leaves take in CO2 and expel O2. Here, CO2 provides the carbon for photosynthesis.

5) Sugars are produced by photosynthesis in leaves and transport as phloem sap to roots and other parts of the plant.

6) Roots exchange gases with the air spaces of soil, taking in O2 and discharging CO2. In cellular respiration, O2 supports the breakdown of sugars.

Note- Xylem transports water and minerals from roots to shoots and Phloem transports sugars from where they are produced and stored to where they are needed for growth and metabolism. 

Produce food ( Carbohydrates or finally sugars) for the plant. This food ( carbohydrates or sugars) is used for the plants growth.

Unlike animals, plants produce their own food. Leaves does the job of producing food, through photosynthesis. Animals eat carbohydrates or proteins to help them grow and develop. Plants make their own carbohydrates (or food)

Addiction is a psycological attachment to certain effects apart from the basic culture of the society. Addiction have no dimensions and obviously can be for anything.we can divide into two types positive addiction and negative addiction. As far as your question is concerned taking in account the present society negative addiction is pysocological cosmos with physical disaster.simply addiction can be of smoking cigarettes and taking various drugs frequently.The time you miss cigarette you feel like your body mind depressed and a kind of anxiety persist. The feeling leads pyscologically only rather than your body needs it. Another addiction prevails in the society is sexual addiction. Psysocologically , we pretend to be a must for us and think about it all the time. There is no certain requirement to be in sexual thing but people do. These leads us in a virtual destiny of finding sexual satisfaction which actually never exist. As a result people be a part of this addiction like drugs. These are few examples of negative addiction but the most cruel because it is damaging our society in all ways.

1.Chloroplast- The green colour pigment present in the plant. 1.Chromoplast- The Colourful pigment present in the plant. Colour can be yellow to red. 2. Chloroplast contains green colour pigment called chlorophyll and carotenoids. Chromoplast contains carotenoids. 3. Chloroplast is responsible for photosynthesis. Chromoplast synthesize and store pigments.

Herbivores have teeth that are highly specialized for eating plants. Because plant matter is often difficult to break down, the molars of herbivores are wider and flatter, designed to grind food, and aid in digestion. Herbivore incisors are sharp for tearing plants, but they may not be present on both the upper and lower jaw. White tail deer are a perfect example of an herbivore that has only lower incisors and a rigid upper jaw that assists in the tearing of plants. Many animals, such as horses and cows, have jaws that are capable of moving sideways. Elephants are herbivores, and their incisors are unlike those found in other animals. Odd as it may sound, a tusk is actually a tooth, an incisor, that has evolved into a different type of tool, often used for defense.

Carnivores have a set of teeth that are very different from herbivores. That makes sense, because they also have a different diet. A carnivore will use its teeth to kill a prey item before eating it. The sharp incisors and pointed canine teeth are perfectly designed for both incapacitating and eating a meal. A canine tooth can be easily identified, as it is the longer, pointed tooth located on either side of the incisors. The molars are fewer in number than other animals may have, mainly because so much of the work is done by the teeth in the front of the mouth. While the presence of canine teeth does not guarantee that an animal is a carnivore, it is an indicator that meat is some part of the diet.

The C 3 ​ plants are called so because the first stable product of photosynthesis in these plants is a three carbon atom containing compound 3- phosphoglyceric acid (3 PGA). This compound is produced by carbon dioxide fixation reaction catalyzed by ribulose 1, 5 bisphosphate carboxylase/ oxygenase (RUBISCO) enzyme, which carboxylates one molecule of five carbon atom containing compound ribulose 1, 5 bisphosphate (RUBP) into two molecules of three carbon atom containing compound 3 PGA.

A Tissue is made up of similar kind of cells which perform a specific funnction. The term Tissue breakdown means that by a process such as injury, or disease or by aging there is a partial or complete loss of the function of that specific tissue having Tissue damage.