Lakhmir Singh & Manjit Kaur Test: Life Processes - Class 10 MCQ

Duodenum is first part of small intestine where common bile duct opens.

Kidney doesn't have any nephridia but have 1 million nephron .The functional unit of kidney is nephron.

Mucus is secreted by cells of gastric gland which forms a slimy layer over inner wall of stomach.

A sphygmomanometer is a device that measures blood pressure. It is composes of an inflatable rubber cuff, which is wrapped around the arm. When the cuff's pressure equals the arterial systolic pressure, blood begins to flow past the cuff, creating blood flow turbulence and audible sounds.

Starch test is done by iodine solution which turns colour of starch, blue-black. 

A blood pressure reading has a top number (systolic) and bottom number (diastolic). Normal blood pressure is less than 120 over 80 (120/80).

Salivary amylase converts starch into sugar. Proteins are digested by pepsin and trypsin while fats are digested by lipase.

The closed circulatory system is where the blood flows into specialized blood vessels such as arteries, veins, and capillaries. In the closed circulatory system, the blood never comes out in direct contact with the tissues. For example, human being, dogs, rat.

Complete digestion and absorption of food takes place in small intestine. Villi present on the surface of inner lining of small intestine increase the absorptive surface.

Transpiration is the process where plants absorb water through the roots and then give off water vapor through pores in their leaves.

Exchange of gases takes place in alveolus of lungs as they are richly supplied with blood capillaries.

Haemoglobin (Hb)
Hb found in Red Blood Cells (RBCs) combines with Dioxygen (O₂) to form Oxyhaemoglobin, which is transported throughout the body by Blood. A Hb molecule can hold 4 oxygen molecules. When this complex comes to its destination (any cell), it is broken into former forms of Hb and Dioxygen.

First step of photosynthesis is absorption of light energy by chlorophyll followed by breakdown of water and release of O₂.

The respiratory route air passes through is: Nostrils → nasal cavity →Pharynx → Larynx →Trachea → Bronchi (with cartilaginous rings) →Bronchioles (without rings)

During inhalation, diaphragm is lowered and ribs move outward resulting in increased volume of lungs so air rushes in. Exchange of gases occur in alveoli.

CO₂ will be pushed out from our lungs and it passes through our nose and while we exhale it comes out so CO₂ is out.

Function of valves in circulatory system is to prevent backflow of blood.

Yeasts break glucose down and produce alcohol and carbon dioxide as their by-products. In yeast fermentation of different foods and beverages, only two parts of ATP is commonly released

Extra cellular fluid is present in between cells of tissues and is also known as tissue fluid or lymph.

Oesophagus

It is a muscular tube that moves the partially digested food from mouth to stomach for further digestion. Hence, the Oesophagus is one part of the digestive system where no digestion occurs.