Question

III.Answer the following Briefly


1. Give the functions of the following in the human body:


(a)Saliva

(b) Liver


2. Mention the various steps in the process of digestion.


3. Mention the end products of respiration.


4. How does respiration occur in plants.​

Answer 1

Answer:

4-In the natural environment, plants produce their own food to survive. As with photosynthesis, plants get oxygen from the air through the stomata. Respiration takes place in the mitochondria of the cell in the presence of oxygen, which is called "aerobic respiration"

Explanation:

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Answer 2

Explanation:

Saliva is deeply associated with health or the functions of our body, including teeth and gums. The production of saliva is promoted when we chew food thoroughly. Saliva has various functions including chemical digestion and cleaning the mouth.

Functions of the liver. The liver regulates most chemical levels in the blood and excretes a product called bile. This helps carry away waste products from the liver. All the blood leaving the stomach and intestines passes through the liver.

There are four steps in the digestion process: ingestion, the mechanical and chemical breakdown of food, nutrient absorption, and elimination of indigestible food. The mechanical breakdown of food occurs via muscular contractions called peristalsis and segmentation.

End products of respiration are carbon dioxide, water and energy in the form of ATP

The process of respiration in plants involves using the sugars produced during photosynthesis plus oxygen to produce energy for plant growth. ... Respiration takes place in the mitochondria of the cell in the presence of oxygen, which is called "aerobic respiration