Class 10 Science - Life Processes

Flashcards for reviewing key concepts from Class 10 Science on Life Processes.

What do autotrophs synthesize carbohydrates from?

Autotrophs synthesize carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll.

Which statement about heterotrophs is correct?

Heterotrophs do not synthesize their own food.

What is the correct sequence of parts in the human alimentary canal?

Mouth → oesophagus → stomach → small intestine → large intestine.

What effect does lacking salivary amylase have in the mouth?

It affects the breakdown of starch into sugars.

What protects the stomach lining from hydrochloric acid?

Mucus protects the stomach lining from hydrochloric acid.

Which part of the alimentary canal receives bile from the liver?

The small intestine receives bile from the liver.

What does a blue-black color indicate when iodine is added to rice water?

It indicates the presence of starch in the rice water.

In which part of the alimentary canal does final digestion occur?

Final digestion occurs in the small intestine.

What does pancreatic juice contain that aids digestion?

Pancreatic juice contains trypsin which digests proteins and lipase which digests emulsified fats.

What makes blood leaving tissues richer in carbon dioxide?

Respiration causes accumulation of carbon dioxide in tissues.

What is an incorrect statement regarding organisms?

Movement of molecules does not take place among cells is incorrect.

What internal energy reserve do autotrophs primarily use?

Autotrophs primarily use starch as their internal energy reserve.

What is the summary equation of photosynthesis?

6CO2 + 12H2O + Chlorophyll + Sunlight→ C6H12O6 + 6O2 + 6H2O.

What does not occur during photosynthesis?

Oxidation of carbon to carbon dioxide does not occur in photosynthesis.

What do plants absorb nitrogen in the form of?

Plants absorb nitrogen primarily in the forms of nitrates and nitrites.

Which enzyme is the first to mix with food in the digestive tract?

Amylase is the first enzyme to mix with food in the digestive tract.

What happens to pyruvate in the absence of oxygen?

Pyruvate is converted to lactic acid.

What is the correct path of urine in the body?

Kidney → ureters → urinary bladder → urethra.