Correct Answer: C) Oxygen

Explanation

Air pollution is the presence of harmful substances in the air that we breathe. The question is asking which of the options listed is not a major air pollutant. The options listed are carbon monoxide, ozone, oxygen, sulphur dioxide, and hydrogen. Carbon monoxide is a poisonous gas produced by incomplete combustion of fuels. It reduces the amount of oxygen in the bloodstream and can cause headaches, dizziness, confusion, and even death. Ozone is a gas that is formed from a chemical reaction between nitrogen oxides and volatile organic compounds in the presence of sunlight. It is a major component of photochemical smog and can cause respiratory problems. Sulphur dioxide is produced by burning fossil fuels and is a major contributor to acid rain. It can cause respiratory problems and can also harm plants and animals. Hydrogen is not a major air pollutant and is actually an important component of water. The correct answer to the question is option C, oxygen. Oxygen is not considered a major air pollutant as it is necessary for the survival of most living organisms. It makes up about 21% of the Earth's atmosphere and is required for respiration. However, excessive amounts of oxygen can also be harmful and can lead to oxidative stress and damage to cells. In summary, the correct answer to the question is option C, oxygen, as it is not considered a major air pollutant. Carbon monoxide, ozone, and sulphur dioxide are all major air pollutants that can cause harm to living organisms and the environment. Hydrogen is not a major air pollutant and is actually an important component of water.

Correct Answer: B. Sneezing

Correct Answer: C. turgidity

Correct Answer: D. Habitat

Correct Answer: D. increase in primary production

Correct Answer: A. Gills, streamlined bodies and lateral lines

Correct Answer: C) Rickets

Explanation

Vitamin D is an important nutrient that our body needs for strong bones and teeth. The question is asking about the deficiency of Vitamin D and what it can lead to. From the options given, the correct answer is C, which is Rickets. Rickets is a condition that affects the bones, causing them to become soft and weak. This can lead to deformities, such as bowed legs and a curved spine. Vitamin D is necessary for the absorption of calcium from the food we eat. Without enough Vitamin D, our bodies cannot absorb enough calcium, which can lead to a deficiency of calcium in our bones. This can cause bones to become soft and weak, leading to conditions such as Rickets. Scurvy, which is option A, is caused by a deficiency of Vitamin C, not Vitamin D. Pellagra, which is option B, is caused by a deficiency of Vitamin B3. Beriberi, which is option D, is caused by a deficiency of Vitamin B1. To prevent a deficiency of Vitamin D, it is important to get enough sunlight exposure as well as consume Vitamin D-rich foods such as fatty fish, egg yolks, and fortified dairy products. If you are not able to get enough Vitamin D from your diet or sunlight, you may need to take Vitamin D supplements.

Correct Answer: C. streptococci

Correct Answer: A. thick barks, succulent stems and sunken stomata

Explanation

a. Vertebrae with corresponding location

b. Function of:

(i) Palisade

- Manufactures food/carries out photosynthesis/site of photosynthesis;

- Contains chloroplasts for photosynthesis;

(ii) Vascular bundle

- Contains xylem for transport of water/mineral salts/phloem for translocation of manufactured organic substances/hormones;

- Provides mechanical support;

(iii) Epidermis

- It keeps the leaf’s shape;

- Provides mechanical support;

c. Function of

(i) Sieve tube

- Translocates/transports manufactured foods to other parts of the plant

(ii) Cortex

- The cells of cortex store starch;

- Outer cortex cells of green stems contain chloroplasts and make food by photosynthesis/chlorophyllus cortex cells manufacture food;

(iii) Epidermis

- Cells of pith act as packing/food storage tissues;

- Supports the stem;

d. Structural differences

(i) External structural differences between stem and root of a maize seedling

(ii) Internal structural differences between stem and root of a maize seedling