It is very important to note that, Photosynthesis is different and Respiration is different. For the process of Photosynthesis, plants intake Carbon dioxide from the atmosphere and uses it with water in presence of Sun Light and the products of Photosynthesis are Glucose, Water and Oxygen.
Normally Respiration denotes the movement of Oxygen into the body of organism (inhale) and release of Carbon dioxide.
Cellular Respiration is the process of reaction of Oxygen with Glucose in the cells of the organisms to produce Energy, Water and Carbon dioxide (this Carbon dioxide is released out).
Hence for respiration, the plants too need Oxygen. Usually, plants uses the Oxygen produced from Photosynthesis process for its respiration instead of getting from atmosphere. The excess Oxygen after using for respiration is given out to the atmosphere. This is generally said as Plants intake Carbon dioxide and gives out Oxygen.
6. According to Buoyant force, When object is immersed in a fluid (liquid or gas), it experiences an apparent loss of weight which is equal to the
a) Weight of the Object itself b) Weight of the Fluid c) Combined weight of the Object and Fluid d) None of the above
The Buoyant force is also called as Archimedes’ principle as it was said by him. According to it, When a body is immersed in a fluid, (liquid or gas) it experiences an apparent loss of weight which is equal to the weight of the fluid displaced. The reason for the apparent loss of weight we know is the buoyant force.
An electric cell has two different metal plates called electrodes kept inside a chemical called electrolyte. Due to chemical reaction, one plate develops a positive charge and the other plate develops a negative charge and produces electric current.
8. In Agricultural practices, the method of Irrigation in which the water is allowed to enter the field through channels made between the two rows of crops is known as
a) Basin Irrigation b) Drip Irrigation c) Sprinkler Irrigation d) Furrow Irrigation
d. Furrow Irrigation (Std 8 – Crop production and management) The Furrow irrigation method is used in crops like Sugarcane, Banana, Paddy.
Basin irrigation: In this method the field is just filled with water. (e.g Paddy) Sprinkler irrigation: This irrigation is used where the soil cannot retain water for a long time. Here the water is sprinkled by sprinklers. e.g. Lawn Drip irrigation: In this irrigation the water falls drop by drop directly at the position of the roots, so it is called drip irrigation. It is the best method to save water. It helps to irrigate grapes, banana, brinjal, etc.
9. The openings in the Leaves, through which the air and water comes out is called as
The skin is like an envelope and its complex structure is divided into three layers of tissues: 1.Epidermis 2.Dermis 3.Hypodermis
Epidermis is the upper layer of the skin. The outermost layer consists of flat, thin and scale – like dead cells. It is separated from the dermis by the basement membrane.
The dermis is the middle layer. It is thick but elastic. The dermis consists of nerves, blood vessels, hair follicles, sweat glands and sebaceous glands (oil glands). Sweat glands separate sweat from the blood.
It is the innermost layer of the skin. It is thick and contains large amounts of adipose tissue.
12. Consider the following properties
I. Its main source is combustion of fuels II. It reacts with hemoglobin in human blood and reduces the affinity of Oxygen with hemoglobin and this may lead to death.
Which Gas has the above properties?
a) Carbon monoxide b) Carbon dioxide c) Nitrogen oxides d) Sulphur dioxide