Question 1

What is the main product stored in plant cells as a result of photosynthesis?

Accepted Answer

During photosynthesis, plants produce glucose which is converted into starch for storage of energy for later use.

Question 2

Which type of nutrition is exhibited by animals that feed on both plants and other animals?

Accepted Answer

Holozoic nutrition is the mode of nutrition where organisms ingest solid food particles and digest them internally; omnivorous animals exhibit this type of heterotrophic nutrition.

Question 3

In the process of photosynthesis, what is the primary role of chlorophyll?

Accepted Answer

Chlorophyll is the green pigment in plant cells that absorbs light energy, which is essential to initiate the photosynthetic process.

Question 4

Which of the following is an example of autotrophic nutrition?

Accepted Answer

Autotrophic nutrition is the ability of organisms to prepare their own food using inorganic substances; green plants do this through photosynthesis using sunlight, water, and carbon dioxide.

Question 5

Which of the following organisms is a heterotroph that feeds on dead organic matter?

Accepted Answer

Fungi are saprophytic heterotrophs that secrete enzymes onto dead organic matter, digest it externally, and absorb the nutrients.

Question 6

Which of the following is an autotrophic organism that produces its own food through photosynthesis?

Accepted Answer

Green plants are autotrophs that synthesize glucose from CO₂ and water using sunlight as energy source during photosynthesis.

Question 7

In the equation of photosynthesis, 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂, what is the role of chlorophyll?

Accepted Answer

Chlorophyll is the green pigment in chloroplasts that absorbs light energy, which is essential for driving the photosynthetic reactions.

Question 8

Which type of nutrition is found in humans and other animals that obtain energy by consuming other organisms?

Accepted Answer

Holozoic nutrition involves ingesting complex organic food, breaking it down, and absorbing nutrients, which is characteristic of animals including humans.

Question 9

The process by which plants absorb mineral nutrients from soil through their roots is called:

Accepted Answer

Plants absorb essential minerals like nitrogen, phosphorus, and potassium from soil solution through active transport and passive diffusion via root hairs.

Question 10

The human digestive system breaks down complex food molecules into simpler forms through mechanical and chemical digestion. Saliva contains an enzyme that begins the breakdown of starch in the mouth. Which enzyme is this, and in which organ does the majority of nutrient absorption occur?

Accepted Answer

Salivary amylase breaks down starch into simpler sugars in the mouth, and the small intestine (duodenum, jejunum, ileum) is the primary site of nutrient absorption.

Question 11

A heterotrophic organism cannot synthesize its own food and depends on other organisms for nutrition. Which of the following best describes the feeding relationship in a food chain where grass is eaten by a rabbit, and the rabbit is eaten by a fox?

Accepted Answer

In a food chain, plants are producers, herbivores are primary consumers, and carnivores that eat herbivores are secondary consumers.

Question 12

In autotrophic nutrition, plants synthesize glucose from carbon dioxide and water in the presence of sunlight. This process is called photosynthesis. The equation 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ represents this reaction. Which statement about this process is correct?

Accepted Answer

Photosynthesis occurs in chloroplasts, converts light energy to chemical energy stored in glucose, and requires light and water.

Agniveer Army Clerk SKT Nutrition in Plants & Animals

Nutrition in Plants & Animals — Practice Questions