Tag: biology

Questions Related to biology

All living things perform the action of 

biology biology : an introduction characteristics of life living world and classification attributes of living organisms

  1. Eating

  2. Growing

  3. Breathing

  4. All of the above

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Correct Option: D
Explanation:
All living things show following distinguished characters
  • Reproduction and metabolism
  • Response to stimuli.
  • Growth and development.
  • Adaptation through evolution
For showing these characters they perform an act of eating, growing, adapting, moving and breathing.
Hence the option D "all of the above" is correct.

Fish breathe through

biology biology : an introduction characteristics of life living world and classification attributes of living organisms

  1. Gills

  2. Lungs

  3. Stomata

  4. Skin

Show answer
Correct Option: A
Explanation:
In aquatic animals such as fish, respiration takes place through special respiratory organs called gills. Gills are present on lateral sides of the head of fish. It is made of gill filaments present on gill arches which are heavily supplied with blood capillaries for an exchange of gases. the filaments increase the area of absorption.
Hence the correct option is A "gills".

When living things grow old, they

    biology biology : an introduction characteristics of life living world and classification attributes of living organisms

    1. Move

    2. Breathe

    3. Eat

    4. Die

    Show answer
    Correct Option: D
    Explanation:

    Humans looks different as they age. Height and weight increases with the time. All living things grow and change. Ultimately, all living things grow old and die. Non-living things do not grow.

    Main function of leaf is _____.

    biology the leaf morphology of leaf structure of a leaf basics of leaf and flower

    1. Transpiration

    2. Exchange of gases

    3. Photosynthesis

    4. Cooling

    Show answer
    Correct Option: C
    Explanation:

    The main function of leaf is photosynthesis. It produces food for the plant. It has a photosynthetic pigment chlorophyll which converts solar energy into chemical energy. The leaf is also involved in the transpiration process. The transpiration process helps in cooling of plant. The exchanges of gases takes place through stomata present on the leaves.

    Thus, the correct answer is 'Photosynthesis.'

    Saliva contains .......... enzyme which hydrolyses starch into 

    biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

    1. Hydrolase, maltase

    2. Amylase, maltose

    3. Amylose, kinase

    4. None of the above

    Show answer
    Correct Option: B
    Explanation:

    The digestion of food begins at the mouth where the saliva is secreted by the salivary gland that contains an enzyme called as salivary amylase enzyme which hydrolyzes starch into maltose but the complete digestion of starch occurs only in the small intestine by the action of pancreatic amylase. 

    Ptyalin is an enzyme present in

    biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

    1. Gastric juice

    2. Pancreatic juice

    3. Intestinal juice

    4. Saliva

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    Correct Option: D

    Starch is changed to maltose by

    biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

    1. Diastase/amylase

    2. Invertase

    3. Lipase

    4. Zymase

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    Correct Option: A

    Substrate for amylase enzyme is

    biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

    1. Nucleic acid

    2. Protein

    3. Starch

    4. Fat

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    Correct Option: C

    If you chew on a piece of bread long enough, it will begin to taste sweet because

    biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

    1. maltase is breaking down maltose

    2. lipases are forming fatty acids

    3. amylase is breaking down starches to disaccharides

    4. disaccharides are forming glucose.

    Show answer
    Correct Option: C
    Explanation:

    When you chew a piece of bread long enough, it will begin to taste sweet because amylase breaks down the starch to disaccharides.  

    So the correct option is C.

    Emulsification of facts is done by-

    biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

    1. Saliva

    2. bile

    3. gastric juices

    4. intestinal juices

    Show answer
    Correct Option: A
    Explanation:

    Chemical digestion takes place as lingual lipase, an enzyme in your saliva, begins to emulsify fat and saliva moistens the food to make it easier to swallow. When the food reaches your stomach, the muscles there begin to churn and move to further break it down. So the correct option is 'Saliva'.