Correct Answer: C) Calcium

Explanation

This Biology question is asking which element is not associated with leaf chlorosis. Chlorosis is the yellowing of leaves due to a lack of chlorophyll, which is a pigment essential for photosynthesis. The options given are Nitrogen, Iron, Calcium, and Magnesium. Nitrogen is a major nutrient needed for plant growth, and its deficiency can lead to chlorosis. Iron and magnesium are also essential nutrients for plants and their deficiency can result in chlorosis. However, calcium is not directly associated with chlorosis. Calcium is important for plant cell wall development and is involved in various physiological processes in plants, such as cell division, signaling, and stress responses. Its deficiency can lead to other symptoms such as stunted growth and poor fruit development, but not chlorosis. Therefore, option C, Calcium, is the correct answer to this question. It's important to note that nutrients play various roles in plant growth and development, and their deficiency can result in different symptoms. For example, nitrogen deficiency can cause stunted growth, while magnesium deficiency can cause interveinal chlorosis. Therefore, it's crucial to identify the specific symptoms of nutrient deficiency before applying fertilizer or other corrective measures.

Correct Answer: B. 3

Correct Answer: B. there is limited amount of rainfall

Explanation

(a)(i) What is ecological succession?

(ii) Describe the process of ecological succession on a bare plot of land.

(b) Explain the following terms:

(i) biosphere

(ii)population

(iii)community

(iv)ecosystem.

(c) Name one instrument each used for measuring:

(i) relative humidity

(ii) wind speed

Correct Answer: B. kidney

Correct Answer: A. Quill

Correct Answer: A. Food vacuole

Correct Answer: C) hepatic portal vein

Explanation

The question is asking about the blood vessel that carries blood from the alimentary canal to the liver. The options are hepatic artery, hepatic vein, hepatic portal vein, mesenteric, and hepatic mesentenism. Out of these options, the correct answer is the hepatic portal vein. This vein is responsible for carrying nutrient-rich blood from the small intestine and stomach to the liver. The liver then processes the nutrients and removes any harmful substances from the blood before it is sent to the rest of the body. It is important to note that the hepatic artery and hepatic vein are also important blood vessels in the liver, but they carry oxygen-rich blood to and from the liver, respectively. The mesenteric blood vessels are responsible for carrying blood to and from the intestines, while hepatic mesentenism is not a valid term in biology. Understanding the role of the hepatic portal vein is important in understanding how the digestive system and liver work together to maintain the body's health.

Correct Answer: A. Colour of flower

Explanation

Colour of flower: The colour of flowers in plants typically shows discontinuous variation. Flowers can have specific colors like red, blue, yellow, or white, and individuals within a population will usually exhibit one of these distinct flower colors. There are no intermediate or blending colors between the different categories.

Correct Answer: B. protection of the foetus from shock