CBSE Questions for Class 10 Biology Life Processes Quiz 5 - MCQExams.com

Solution

Correct answer is option A.

Explanation for correct option:

• A pseudopodia refers to the temporary projection of the cytoplasm of a eukaryotic cell.
• The functions of pseudopodia include locomotion and ingestion.
• Amoeba can change its shape with the help of these pseudopodia to exhibit locomotion. Hence, pseudopodia are known as a false foot in Amoeba.

• The stomach is made of  4 layers. They are serosa, muscularis, submucosa, mucosa. These layers of smooth muscle consist of the outer longitudinal, the middle circular, and the inner oblique muscles.
• The innermost layer or lining (mucosa) contains the glands that release digestive juices which includes pepsin, chymotrypsin, hydrochloric acid etc. Hence, The inner layer of the stomach releases digestive juices.

• Digestion in amoeba is intracellular taking place within the cell. 
• The food is taken in remains in a food vacuole or gastric vacuole formed by the cell membrane and small part of the cytoplasm.
• The vacuoles are transported deeper into the cells by cytoplasmic movements. Here they fuse with lysosomes that contain enzymes. Hence, The digestion of food in amoeba is intracellular.

• Digestion in Amoeba is intracellular; taking place within the cell.
• The food taken in remains in a food vacuole or gastric vacuole formed by the cell membrane and small part of the cytoplasm. 
• The vacuoles are transported deeper into the cells by cytoplasmic movements. Here they fuse with lysosomes that contain enzymes. Hence, in Amoeba vacuole helps in digestion.

• Plaque is a soft, sticky film that builds up on your teeth and contains millions of bacteria. 
• When you eat, the bacteria in plaque use the sugars in your food to produce acids that eat away at the tooth enamel. Hence, Sugar + Plaque → acids.

• Amoeba obtains their food by the process of endocytosis. 
• It has a flexible cell membrane. It engulfs the food particle with the help of pseudopodia and then forms a vacuole around it. 
• When the particle is completely trapped the Amoeba secretes digestive enzymes that digest the food. Hence, Amoeba procures food through pseudopodia.

• The process of expelling waste from the organism is called excretion. Ammonia, urea and uric acid are the major forms of nitrogenous wastes excreted by the animals. Ammonia is the most toxic form and requires a large amount of water for its elimination, whereas uric acid, being the least toxic, can be removed with a minimum loss of water.
  
• The human excretory system consists of a pair of kidneys, ureter, urinary bladder and urethra.
  
• So, the correct answer is 'Excretion'.
  

• According to their food requirements, living organisms can be producers that produce their own food by photosynthesis or consumers, which depend on producers for their food. 
• Among consumers, organisms that eat plant and their products are called herbivores, and the ones that eat other animals are carnivores.
• In the given question, the first, third, and fourth images are of a cat, eagle, and snake. All of them are carnivores. While the second image is that of a monkey, which is a herbivore.

$$\textbf{Correct answer: D}$$ 

$$\textbf{Option (A):}$$ 

$$\bullet$$ The birds mainly feed on the sprouted seeds. Other herbivores may feed on such sprouting seeds.

$$\textbf{Option (B):}$$ 

$$\bullet$$ The food source of carnivorous animals is not milk. 

$$\textbf{Option (C):}$$ 

$$\bullet$$ The herbivores feed on green leaves and they are present as primary consumers. 

$$\bullet$$ These organisms feed on the producers, which are the green plants. 

$$\textbf{Option (D):}$$ 

$$\bullet$$ Carnivores feed on the flesh of other animals as they are present as secondary consumers in the ecosystem. 

$$\bullet$$ They feed on the flesh as they can draw their energy and nutrition from that source directly. 

Hence, the correct answer is option (D).

• Green plants are capable of producing their own food by the process of photosynthesis. They prepare food using carbon dioxide, water, sunlight, and chlorophyll. Thus, they are called primary producers or autotrophs. 
• Heterotrophs are organisms that are incapable of making their own food from light or inorganic compounds. They feed on other organisms or the remains of other organisms.

• Thallophytes (Algae) have a thallus-like body, i.e. the plant body cannot be distinguished into roots, stem, or leaves.
• Thallophytes are autotrophic as they contain chlorophyll.

• Blood pressure is the pressure applied to the wall of the arteries.
• The systolic phase applies greater pressure than the diastolic phase. 
• The normal blood pressure of a human being must be 120/80mmHg.