Ch – 6 Life Processes (Part 1)

Answer the following:

Q.1: The process in which a source of energy from outside the body of organism is transferred to the inside is known as ________________.

Ans: Nutrition

Q.2: Which are some of the most common chemical means to break-down molecules ?

Ans: Oxidising-reducing reactions

Q.3: The process of acquiring oxygen from outside the body and to use it in the process of break-down of food sources for cellular needs is known as ________________.

Ans: cellular respiration

Q.4: The organisms use bio-catalysts called _____________ for breaking complex substances into simple substances.

Ans: enzymes

Q.5: Carbon and energy requirements of the autotrophic organism are fulfilled by _____________.

Ans: photosynthesis

Q.6: ____________ are utilised to provide energy to the plant.

Ans: Carbohydrates

Q.7: Desert plants take up carbon dioxide at _____________.

Ans: night

Q.8: The opening and closing of the pores of stomata is a function of ______________.

Ans: guard cells

Q.9: _____________ is an essential element used in the synthesis of proteins and other compounds.

Ans: Nitrogen

Q.10: In Amoeba’s food vacuole complex substances are broken down into simpler ones and which then diffuse into _______________.

Ans: cytoplasm

Q.11: The alimentary canal is a tube that extends from _____________ to _____________.

Ans: Mouth, Anus

Q.12: The saliva contains an enzyme called ________________.

Ans: salivary amylase

Q.13: The _______________ creates an acidic medium which facilitates the action of enzyme pepsin.

Ans: hydrochloric acid

Q.14: The ___________ protects the inner lining of the stomach from the action of hydrochloric acid under normal conditions.

Ans: mucus

Q.15: The exit of food from the stomach is controlled by _____________.

Ans: sphincter muscle

Q.16: ________________ is the longest part of the alimentary canal.

Ans: stomach

Q.17: The _____________ is the site of complete digestion of carbohydrates, proteins and fats.

Ans: small intestine

Q.18: ___________ break the fat into smaller globules increasing the efficiency of enzyme action.

Ans: Bile salts

Q.19: The ______________ is the enzyme for digesting proteins.

Ans: Trypsin

Q.20: The ______________ is the enzyme for breaking down emulsified fats.

Ans: Lipase

Q.21: The exit of waste material from the body is regulated by ________________.

Ans: anus sphincter

Q.22: Dental caries causes gradual softening of ____________ and _____________.

Ans: enamel, dentine

Q.23: In respiration process, the first step is the break-down of glucose, a six-carbon molecule, into a three-carbon molecule called ________________.

Ans: pyruvate

Q.24: The process of breaking down of glucose takes place in ________________.

Ans: cytoplasm

Q.25: Breaking down of pyruvate using oxygen takes place in _______________.

Ans: mitochondria

Q.26: ____________ is the energy currency for most cellular processes.

Ans: ATP

Q.27: When the terminal phosphate linkage in ATP is broken using water, the energy equivalent to _____________ is released.

Ans: 30.5 kJ/mol

Q.28: State the purposes for which ATP can be used.

Ans: contraction of muscles, protein synthesis, conduction of nervous impulses

Q.29: The ____________ provide a surface where the exchange of gases can take place.

Ans: alveoli

Q.30: In humans, the respiratory pigment is _______________ which has a very high affinity for oxygen.

Ans: haemoglobin

Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

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