Science Answer the following questions:[1 M]

1. Phloem.
2. Xylem.

1. Phloem.
2. Xylem.

Translocation.

Phloem.

Heart beat: One complete contraction and relaxation of the heart is called a heart beat. The usual heart beat rate at rest is 72 times/ minute.

Capillaries.

1. Respiration.
2. Photosynthesis.

1. Water.
2. Food.

Chlorophy ll.

1. Glucose.
2. Starch.

Lungs.

Autotrophs are those organisms which can make their own food from carbon-dioxide and water.
Example: Green Plants.

Amoeba has no fixed place for egestion. The undigested food gets collected inside amoeba, then its cell membrane suddenly ruptures and the undigested food is thrown out of the body of amoeba.

Hypertension.

Saprotrophic.

Blood and lymph.

Chlorophyll.

Green.

Chlorophy ll.

Earthworm.

1. Oxygen.
2. Carbon-dioxide.

Small intestine.

Trypsin: It is a pancreatic enzyme present in the pancreatic juice. Its function is to digest the proteins.

Trachea.

The process of obtaining food is called phagocytosis, which means cell feeding.

Plants obtain food by a process called photosynthesis.

Root hair.

Ureters.

The heart beats faster when a person runs for a while because the body needs more energy under these conditions.

When there is a kidney failure then dialysis machine is used. Dialysis cleans the blood of a person by separating the waste substance (urea) from the blood.

Large intestine.

Urea.

Oxygen and carbon-dioxide.

Alveoli.

Pepsin.

Saliva.

Bronchi.

Capillaries.

Glomerulus present in kidneys.

Guard cells.

Plant kept in continuous light will live longer because it will be able to produce oxygen required for its respiration by the process of photosynthesis.

1. Right side.
2. Left side.

Amoeba.

Ventricles.

Atria.

If mucus is not secreted, hydrochloric acid will cause the erosion of inner lining of stomach leading to the formation of ulcers in the stomach.

Phloem.

1. Herbivores.
2. Carnivores.
3. Omnivores.

Dialysis.

Photosynthesis.

Carbon-dioxide, water vapour and oxygen.

Heart needs valves to prevent the backflow of blood so that the blood flows only in one direction.

Lactic acid.

Trachea does not collapse even when there is no air in it because it is supported by rings of soft bones called cartilage.

Peristaltic movements.

The walls of small intestine has finger like projections like villi which increases the surface area for absorption.

1. Oxygen.
2. Carbon-dioxide.

Alcohol.

Lenticels.

Glucose passes through the glomerulus alongwith the filtrate and gets collected in the Bowman’s capsule.

Leaves.

Lactic acid.

Digestive enzymes.

1. Arteries.
2. Veins.

Vena Cava.

Haemoglobin.

We boil the leaf in Alcohol to remove all its green pigment called chlorophy ll.

A fish has single circulation of blood and a frog has double circulation of blood.

Urinary bladder is a bag which stores the urine temporarily till it is excreted out.

A is glucose and B is starch.

The process of removal of toxic waste from the body of an organism is called excretion. The excretory unit of a kidney is called nephron.

Aerobic respiration.

Herbivores eat only plants so they need a longer small intestine to allow the cellulose present in the plants to be digested completely.

Nitrogen, phosphorus, iron and magnesium.

The human lungs have been designed to maximise the exchange of gases as there are millions of alveoli in the lungs which provides a large surface area for the exchange of gases.

Valves stop the blood from flowing backward through the heart.

Sunlight and chlorophy ll.

Autotrophs.

No.

Amoeba.

Digestive enzymes.

Chloroplast.

Alveoli.

Urinary bladder.

Blood.

Carbon dioxide and Water.

When air passes through the nasal passage, the dust particles and other impurities present in it are trapped by nasal hair and mucus so that clean air goes into the lungs.

Saprophytic – Fungi. Parasitic – Plasmodium. Holozoic – Human Beings.

Heart.

Food is the basic requirement of living organisms for obtaining energy.

Chloroplast.

Photosynthesis.

The conditions necessary for autotrophic nutrition are sunlight, chlorophyll, carbon-dioxide and water.

Yeast can live without oxygen.

Blood circulatory system and lymphatic system.

The mode of nutrition in amoeba is holozoic.

X is sunlight energy and Y is chemical energy.

Root hairs.

Green Plant.

1. Carnivores.
2. Herbivores.
3. Omnivores.

Peristaltic movement.

Urethra is a tube which passes out the urine from the body collected in the urinary bladder.

Absorption of digested foods occurs mainly in the small intestine due to the presence of a large number of finger like projections called villi.

Stomata.

1. The largest artery in the human body is ‘Aorta’.
2. The largest vein in the human body is ‘Vena Cava’.

Villi.

1. Small Intestine.
2. Large Intestine.

Chemical Energy.

Salivary amylase is present in human saliva. It digests starch. Which of the organs perform the following functions in humans?

1. Absorption of food.
2. Absorption of water.

Ingestion, digestion, absorption, assimilation, egestion.

1. Phloem.
2. Xylem.

Ethanol.

Paramecium.

The evaporation of water from the leaves of the plants is called transpiration.

Oesophagus.

Parasitic mode of nutrition.

Stomata in the leaves and lenticels in the stems are two parts through which a plant releases its gaseous waste products into the air.

Anus.

Oxygen.

Diffusion.

Haemoglobin.

The contraction and expansion movements of oesophagus also called peristaltic movements pushes the food down into the elementary canal.

Ethanol and carbon-dioxide.

The liquid part of the blood is called plasma. Platelets help in the coagulation of blood in a cut or wound.

The basic functions performed by living organisms to maintain their life on this earth are called life processes. The basic life processes common to all living organisms are?
Nutrition and Respiration; Transport and Excretion; Control and Coordination; Growth; Movement and Reproduction.

Carbon-dioxide and urea.

Gills.

The carbon-dioxide gas enters the leaves of the plants through the stomata present on their surface.

Carbon-dioxide and water.

Transport of food.

Prawns and mussels.

Xylem and phloem.

The transport of food from the leaves to the other parts of the plant is called translocation.

Carbon-dioxide.

Enzymes help in the breaking down of complex organic food materials into simpler forms.

Guard cells.

There are three types of blood vessels – arteries, veins and capillaries.

Lymph.

The function of glomerulus is to filter the blood passing through it and initiate urine formation.

Heterotrophs.

The criteria to decide whether something is alive is the movement.