SELECT THE CORRECT ALTERNATIVE:
- ______ is associated with the transport of water in plants.
- Tracheae are found in ______ plants.
- all three
- The inner wall of the tracheids and tracheae shows deposition of ______.
- Which of the following is not a property of blood plasma ?
- It is pale yellow
- It is nonliving
- It is acidic
- It contains hormones
- Which of the following is not a blood corpuscle ?
- Which of the following is true for human erythrocytes ?
- They are biconvex.
- They have nucleus.
- They contain haemoglobin.
- They do not have nucleus but possess mitochondria.
- ______ is a respiratory pigment.
- The lifespan of erythrocytes is about ______ days.
- Which of the following is false ?
- Erythrocytes are light red in colour.
- Haemoglobin is a respiratory pigment.
- Lymphocytes produce immunoglobulins.
- Thrombocytes destroy pathogens.
- ______ is a necessary mineral for clotting of blood.
- ______ converts liquid fibrinogen into solid fibres of fibrin.
- There are ______ types of antigens on the erythrocytes.
- The blood group of a person is O and Rh (-ve). He can donate blood to...
- any person
- a person with group O
- A person with Rh (-ve)
- Which of the following is true ?
- Heart purifies blood.
- Heart separates excretory products from blood.
- Heart circulates blood.
- Blood flows from heart to lungs.
- The relaxed state of yeart is called ______.
- Diastolic state
- Systolic state
- Thermostatic state
- Primary state.
- The structure for excretion and osmoregulation in sponges is ______.
- contractile vacuole
- flame cell
- Urine mainly consists of ______.
- Birds excrete wastes in the form of ______.
- uric acid
- Which structure is responsible for transportation of water in pteridophytes ?
- Sieve cells
- Sieve tubes
- Which structure has lignified cell wall ?
- Sieve tube
- Sieve cells
- Which blood cells contain haemoglobin ?
- Which blood cells produce immunoglobin ?
- Which chemical is released when blood cells rupture ?
- Where are antigens for blood group located ?
- Blood plasma
- How many chambers are present in human heart ?
- Where is bicuspid valve found in human heart ?
- Between two atria
- Between left auricle and left ventricle
- Between two ventricles
- Between right auricle and right ventricle.
- Through which parts of the heart does oxygenated blood flow ?
- Both atria
- Left auricle and left ventricle
- Both ventricles
- Right auricle and right ventricle
- Where does deoxygenated blood get oxygenated ?
- Which type of blood flows through all arteries ?
- With nitrogenous waste
- What is the shape of human heart ?
- Bean shaped
- Carboxy-haemoglobin is formed when haemoglobin reacts with...
ANSWER IN SHORT:
- Define : Transportation.
ANS : The movement of different types of substances absorbed or synthesized in one part of the body to another part of the body is called transportation.
- Mention two main components of xylem responsible for the transportation of water.
ANS : Tracheids and tracheae (vessels) are two main components of xylem responsible for the transportation of water.
- What are tracheids ?
ANS : Tracheids are long, thin and spindle shaped cells of xylem of a plant.
- Why are tracheids dead cells ?
ANS : Tracheids are dead cells because their nuclei are disintegrated.
- What is ascent of sap ?
ANS : The transportation of water and minerals from the roots to the leaves is known as the ascent of sap.
- How much of the water absorbed by the plants is used up in photosynthesis and other metabolic processes ?
ANS : Only about 5% of water absorbed by the plants is used up in photosynthesis and other metabolic processes.
- Define : Transpiration.
ANS : The process by which water absorbed by plants through roots is lost (thrown out) in the form of vapours is called transpiration.
- Where are plant hormones synthesized ?
ANS : Plant hormones are synthesized at the shoot and root tips.
- What is the function of phloem ?
ANS : Phloem translocates carbohydrates, essential substances, plant hormones, etc. from their place of origin to the site where needed.
- In which plant is a sieve cell the main component of phloem ?
ANS : In pteridophytes and gymnosperms sieve cell is the main component of phloem.
- In which plants are the sieve tube and companion cell the main components of phloem ?
ANS : In angiospermic plants the sieve tube and companion cell are the main components of phloem.
- What regulates metabolic activities carried out in the sieve tube cells ?
ANS : The nucleus of the companion cell regulates metabolic activities carried out in the sieve tube cells.
- Define : Sieve pores.
ANS : The perforations in the transverse walls (sieve plates) present between sieve tube cells are called sieve pores.
- Define : Translocation.
ANS : The transport of food from leaves to other parts of plants is called translocation.
- What is the need for translocation of food ?
ANS : Translocation of food is necessary to fulfil the daily requirement of energy, to replace the worn out cells and for the growth of the plant.
- Define : Circulatory system.
ANS : The system associated with the transport of various substances like nutrients, hormones, enzymes, respiratory gases, excretory products, etc. is called circulatory system.
- Mention two main components of blood.
ANS : Blood plasma and blood corpuscles are the two main components of blood.
- Mention three main types of blood corpuscles.
ANS : Erythrocytes (RBC), leucocytes (WBC) and thrombocytes (platelets) are three types of blood corpuscles.
- Why is haemoglobin called respiratory pigment ?
ANS : Haemoglobin is called respiratory pigment because it transports respiratory gases (O2 and CO2) between lungs and organs.
- Where are erythrocytes formed ?
ANS : Erythrocytes are formed in the bone marrow.
- Which type of WBC produce immunoglobulins ?
ANS : Lymphocytes produce immunoglobulins.
- What is serum ?
ANS : Serum is a viscous pale yellow liquid that oozes out from the periphery of a blood clot.
- Define : Blood transfusion.
ANS : The transfer of blood from a healthy donor to a needy patient is called blood transfusion.
- Who discovered the presence of special antigens on the surface of erythrocytes ?
ANS : Carl Landsteiner discovered the presence of special antigens on the surface of erythrocytes.
- Mention different blood groups in human beings.
ANS : The blood groups present in human being are : A, B, AB and O.
- What happens during the diastolic state of heart ?
ANS : During diastolic state of heart, deoxygenated blood from organs enters right atrium through the superior and inferior vena cava and oxygenated blood from lungs enters left atrium through pulmonary vein.
- Why is circulation of blood through heart called 'double circulation' ?
ANS : The circulation of blood through heart is called 'double circulation' because deoxygenated blood from body organs passes twice through heart before it reaches the organs in oxygenated form.
- Define : Artery.
ANS : The blood vessel which carries blood from heart to different organs of the body is called artery.
- Define : Vein.
ANS : The blood vessel which carries blood from different organs to the heart is called vein.
- What is lymph ?
ANS : The transparent fluid which oozes out in the surrounding intercellular space and the tissue cells from the blood flowing in the capillaries is called lymph.
- Which cells does lymph contain ?
ANS : Lymph contains lymphocytes.
- What constitutes lymphatic system ?
ANS : Lymphatic system consists of lymphatic vessels, lymphatic capillaries, lymph nodes and lymph glands.
- Define : Excretion.
ANS : The biological process involved in the removal of liquid excretory substances from the body is called excretion.
- Define : Osmoregulation.
ANS : The process of maintaining the required amount of water and proper ionic balance in the body is called osmoregulation.
- What is the structure for excretion and osmoregulation in amoeba known as ?
ANS : The structure for excretion and osmoregulation in amoeba is known as contractile vacuole.
- What is the structure for excretion in earthworm known as ?
ANS : The structure for excretion in earthworm is known as nephridia.
- What is the structure for excretion in platyhelminthes known as ?
ANS : The structure for excretion in platyhelminthes is known as flame cells.
- What does hydra have for excretion and osmoregulation ?
ANS : Hydra has oral opening for excretion and osmoregulation.
- Mention the types of nephridia in earthworm.
ANS : The types of nephridia in earthworm are : (i) septal (ii) pharyngeal and (iii) integumentary.
- Which two types of excretion is shown by the earthworm ?
ANS : Enteronephric excretion and exonephric excretion are the two types of excretion shown by the earthworm.
- What is enteronephric excretion ?
ANS : In enteronephric excretion the excretory products are poured into the alimentary canal through nephridia.
- What is exonephric excretion ?
ANS : In exonephric excretion the excretory products are thrown out of the body through the skin.
- Where are human kidneys located ?
ANS : Human kidneys are located in the abdomen on the dorsal side.
- What is ultrafiltration ?
ANS : The filtration of blood carrying waste material under pressure in glomerulus is known as ultrafiltration.
- What do desert animals do for osmoregulation ?
ANS : Since desert animals cannot afford to lose water, they convert the concentrated waste into crystals of uric acid.
- Which substance provides mechanical support to the walls of xylem ?
ANS : Lignin provides mechanical support to the walls of xylem.
- What is transported through sieve plate ?
ANS : Food is transported through sieve plate.
- Mention the colour of blood and lymph.
ANS : The colour of blood and lymph is red and pale yellow respectively.
- What is the shape of human erythrocytes ?
ANS : Human erythrocytes are round, biconcave in shape.
- Which mineral is present on haemoglobin ?
ANS : Iron is present in haemoglobin.
- Where are blood cells produced in our body ?
ANS : Blood cells are produced in the bone marrow of long bones.
- Mention two functions of WBC.
ANS : The two functions of WBC are : (i) They destroy pathogenic microorganisms. (ii) They destroy harmful substances.
- Give examples of enucleated blood cells.
ANS : RBC (erythrocytes) and platelets are enucleated blood cells.
- State the function and location of stem cells.
ANS : Stem cells are located in the bone marrow of long bones and they produce all types of blood corpuscles.
- Where is thromboplastin produced ?
ANS : Thromboplastin is produced at the point of injury where blood vessels rupture.
- Which mineral is needed to convert prothrombin into thrombin ?
ANS : Mineral calcium is needed to convert prothrombin into thrombin.
- What converts fibrinogen to fibrin ?
ANS : Thrombin converts fibrinogen to fibrin.
- Where are blood antigens located ?
ANS : Blood antigens are located on the surface of erythrocytes.
- Why does right atrium appear dark in colour ?
ANS : Right atrium appears dark in colour because it has deoxygenated blood in it which is dark in colour.
- Why does left venticle appear red in colour ?
ANS : Left ventricle appears red in colour because it has oxygenated blood in it which is red in colour.
- What type of valves are found in veins ?
ANS : The valves in veins are of the type which allows blood to flow towards heart and stops it from flowing in opposite direction.
- Where is tricuspid valve present in human heart ?
ANS : Tricuspid valve is present between right atrium and right ventricle of heart.
- To which part of the body does pulmonary artery supply blood ?
ANS : Pulmonary artery supplies blood to lungs (from heart).
- What is the function of pulmonary vein ?
ANS : Pulmonary vein collects blood from lungs and supplies it to the left atrium.
- Define : Conduction.
ANS : The upward movement of water (absorbed by roots) through tracheids is called conduction.
- Define : Double circulation.
ANS : The circulation of blood through heart is called double circulation because deoxygenated blood from body organs passes twice through heart before it reaches the organs in oxygenated form.
- What are blood capillaries ?
ANS : Fine, thin-walled and narrow tubular branches of arterioles which reunite to form venules are called blood capillaries.
- Define : Companion cell.
ANS : The cells arranged laterally and longitudinally to sieve tube cells in the phloem of angiospermic plants are called companion cells.
- Which organelle is absent in human RBC ?
ANS : Nucleus and mitochondria are absent in RBC.
- State the location and function of stem cells.
ANS :Stem cells are located in bone marrow of long bones and their function is of formation of all types of blood cells.