The correct answer is option 3 i.e. Copper.

When a copper vessel is exposed to moist air for a long time, a green layer develops on its surface.

Copper metal turns green due to corrosion when exposed to air.

When a copper vessel is exposed to air during the rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide.

This gives green color to the surface of copper metal.

The correct answer is Option 4 i.e. Plastids.

Plastids are only present in plants.

The work of plastids is to give green colour to plants.

It is responsible for photosynthesis in plants.

Plastids are not present in the animal cell as they don't need photosynthesis for the production of food.

The correct answer is option 3 i.e. Only II.

The pair provided includes one correct and one incorrect statement:

Red blood cells - Square shape: Incorrect. Red blood cells (RBCs) have a biconcave disc shape, not square. This shape aids in maximizing surface area for oxygen exchange and flexibility to travel through capillaries.

Muscle cells - Spindle shape: Correct. Smooth muscle cells are spindle-shaped, meaning they are elongated with tapering ends, allowing them to contract efficiently and perform their functions in the body.

Thus, only the second pair is correct.

The correct answer is option 1 i.e. eating disorder.

Eating Disorder:

Eating disorders can be a major cause of mental diseases.

During this period, patients eat more or stop eating completely.

This problem is seen more in women

Many times, the patient's body fat reduces so much that he has to face a dangerous disease like anorexia nervosa.

Neurodevelopmental Disorders:

Neurodevelopmental problems are conditions related to the nervous system that can cause a person to have trouble acquiring, remembering, or using specific skills or information. These may impair attention, memory, perception, language, problem-solving, or social interaction.

Bipolar Disorder:

Bipolar Disorder Bipolar disorder is a mental health condition. People with bipolar disorder have mood swings ranging from feeling unusually happy or high (manic) to feeling incredibly low and sad. These mood swings occur regardless of what is happening in a person's life.

Anxiety disorder:

Anxiety disorders are a group of mental health conditions that involve excessive and irrational fear and worry about various aspects of life. Anxiety disorders can affect anyone regardless of age, gender, culture or background.

The correct answer is Option 3 i.e. Vitamin B1.

Thiamin is another name for vitamin B1.

One of the B-complex vitamins and a necessary component for the body is thiamin.

It is essential for the neurological system to continue functioning normally and for the body to turn food into energy.

Thiamin deficiencies can cause disorders such as beriberi, which impact the cardiovascular and neurological systems.

The correct answer is Option 2 i.e. Saprotrophic.

The mode of nutrition in which organisms obtain nutrients from dead and decaying organic matter is called saprotrophic nutrition. Saprotrophic organisms, also known as saprotrophs, secrete digestive enzymes onto the dead matter, breaking it down externally. They then absorb the resulting nutrients directly through their cell walls or membranes. This process is essential for nutrient cycling in ecosystems, as it helps break down complex organic materials into simpler substances. Fungi and some bacteria are typical examples of saprotrophs, playing a vital role in decomposing organic matter in nature.

The correct answer is option 1 i.e. rubber.

Among the options provided—rubber, cotton, hemp, and jute—the odd one out is rubber.

Rubber is primarily a latex-producing crop used for making rubber products, not a fiber crop.

In contrast, cotton, hemp, and jute are all fiber crops, meaning they are grown specifically for their fibers, which are used to make textiles and other products. Hence, rubber is different from the others, which are all fiber crops.

The correct answer is option 2 i.e. Liver fluke.

• Liver fluke is the name of the creature that is not a member of the phylum Coelenterata.
• Animals like sea anemones, brain coral, and sea pens belong to the Coelenterata or Cnidaria class.
• Platyhelminthes is a phylum that is separate from the Coelenterata group, and this is where liver fluke falls.

The correct answer is option 4 i.e. Bryophytes.

Marchantia and moss are members of the plant family called "Bryophytes." Since bryophytes are non-vascular plants, they do not have specific tissues for the movement of nutrients and water.

These are prehistoric terrestrial plants, such as liverworts (Marchantia) and mosses (common garden moss).

These plants, which are among the earliest terrestrial ones, are vital to ecosystems because they generate soil and serve as environmental indicators.

The correct answer is option 1 i.e. three.

Adolescents should have three balanced meals of average size each day—breakfast, lunch, and dinner. These meals should include a variety of nutrients such as proteins, carbohydrates, fats, vitamins, and minerals to support their rapid growth and development. In addition to these three meals, healthy snacks can be included to meet their increased energy needs. Proper meal timing and balanced nutrition are crucial for maintaining energy levels and overall health during adolescence.