Table of contents | |
Fill in the blanks | |
Match the Column | |
Very Short Answer Type Questions | |
Short Answer Type Questions |
Q1: Plants get rid of excess water by ........................
Ans: Plants get rid of excess water by transpiration.
Transpiration is the process where:
Overall, transpiration is essential for plant health and growth.
Q2: ........................ and water are produced as wastes during respiration by plants.
Ans: CO2 and water are produced as wastes during respiration by plants.
Q3: ........................ is produced as a waste during photosynthesis.
Ans: Oxygen is produced as a waste during photosynthesis.
Q4: The gaseous wastes of respiration and photosynthesis in plants are removed through the .................... in leaves and ....................... in stem and released to the air.
Ans: The gaseous wastes of respiration and photosynthesis in plants are removed through the stomata in leaves and lenticels in the stem, then released into the air.
Q5: The plants excrete CO2 produced as a waste during .................. process in night time.
Ans: The plants excrete CO2 produced as a waste during the respiration process at night.
Q6: Gums and resins are the ...................... products of plant.
Ans: Gums and resins are the waste products of plants.
Q7: The phenomenon of removal of waste products from the body is known as ......................
Ans: The phenomenon of the removal of waste products from the body is known as excretion.
Q8: Leaves of ...................... contain essential oils.
Ans: Leaves of tulsi and lemon contain essential oils.
Q9: ...................... are found in stem of conifers as waste product.
Ans: Resins are found in the stems of conifers as a waste product.
Q10: Aquatic plants lose most of their metabolic wastes by ...................... process.
Ans: Aquatic plants lose most of their metabolic wastes through the process of diffusion.
Match the items of Column A with items of Column B.
Ans:
A - (ii)
B - (iv)
C - (iii)
D - (i)
Q1: Define nutrition.
Ans: Nutrition is the process by which organisms consume food and use its nutrients to support their bodily functions.
Q2: Name the enzymes present in the stomach.
Ans: Pepsin is the main enzyme found in the stomach. It plays a crucial role in the digestive process by breaking down proteins into smaller peptides.
These enzymes work together to ensure effective digestion in the stomach.
Q3: Which part of the body secretes bile? Where is bile stored?
Ans: Bile is secreted exclusively by the liver and is stored in the gall bladder.
Q4: Define peristalsis.
Ans: Peristalsis is the process by which food is moved through the digestive tract. It involves:
This coordinated movement ensures that food is processed efficiently at each stage of digestion.
Q5: What is the emulsification of fat?
Ans: Emulsification is the process of breaking down large fat globules into smaller ones, making them soluble in water.
Q6: Name the enzyme present in human saliva. What type of food material is digested by this enzyme?
Ans: The enzyme present in human saliva is ptyaline, also known as salivary amylase. This enzyme plays a key role in the digestion of:
Starch
Ptyaline begins the process of starch digestion in the mouth.
Q7: Define assimilation.
Ans: Assimilation refers to the process of the body or any biological system absorbing and digesting food or nutrients.
Q8: Name the most common method of ingestion in Amoeba.
Ans: Phagocytosis is the primary method of ingestion in Amoeba.
Q9: Why is the food vacuole of Amoeba called a temporary stomach?
Ans: In amoeba, the food vacuole acts as a temporary stomach because:
This cycle of formation and disappearance is why it is referred to as a 'temporary stomach'.
Q10: Name different types of teeth present in man.
Ans: Different types of teeth present in man:
Q11: Which part of the alimentary canal is adapted for complete digestion and absorption of food?
Ans: The small intestine is specifically adapted for the complete digestion and absorption of food. It plays a crucial role in the digestive process due to the following features:
These adaptations make the small intestine essential for effective digestion and nutrient uptake.
Q12: What is succus entericus?
Ans: Succus entericus is an alkaline secretion produced by glands in the duodenum wall. It includes:
This intestinal juice, secreted by Lieberkuhn's crypts, serves several important functions:
Q13: Name the largest gland of the human body.
Ans: The liver is the largest gland in the human body.
Q14: Name the protein-digesting enzymes present in the pancreatic juice of man.
Ans: Trypsin is a key protein-digesting enzyme found in human pancreatic juice.
Q15: What are the end-products of fat digestion?
Ans: Fats are digested primarily in the small intestine. During digestion, one triglyceride molecule is broken down into:
The liver produces bile, which aids in the digestion of fats and some vitamins.
Q1: Describe various modes of nutrition.
Ans: Nutrition is mainly divided into two categories:
Autotrophic mode of nutrition:
Heterotrophic mode of nutrition:
Q2: Mention various steps of nutrition in Amoeba.
Ans: Amoeba exhibits a type of nutrition known as holozoic nutrition, which involves the ingestion of solid or liquid food. The steps involved in this process are as follows:
Q3: Draw the position of salivary glands in the mouth.
Ans:
Q4: What is the role of hydrochloric acid in our stomach?
Ans: Hydrochloric acid plays a crucial role in the stomach by:
Q5: State two functions of the large intestine of man.
Ans: The large intestine has two main functions:
Q6: What criteria do we use to decide whether something is alive?
Ans: All living organisms are composed of cells and exhibit specific characteristics that indicate life. These include:
The presence of these life processes is a key criterion to determine if something is alive.
Q7: What are the differences between autotrophic nutrition and heterotrophic nutrition?
Ans:
Q8: How is the small intestine designed to absorb digested food?
Ans: The small intestine is crucial for the digestion and absorption of food. It consists of three main sections:
The innermost layer, known as the mucosa, has special adaptations:
These structures significantly increase the surface area for absorption. Each villus contains:
The walls of the small intestine are surrounded by blood vessels that distribute absorbed food molecules throughout the body.
Q9: What is the difference between ingestion and egestion?
Ans:
Q10: How can dental caries be prevented?
Ans: Dental caries can be prevented by following these key practices:
By implementing these steps, you can significantly reduce the risk of dental caries.
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1. What are the main life processes essential for living organisms? |
2. How do organisms obtain nutrition, and why is it important? |
3. What is the role of respiration in living organisms? |
4. How do living organisms carry out excretion, and why is it necessary? |
5. What is the significance of reproduction in life processes? |
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