NCERT Solutions For Class 11 Biology Chapter 12

NCERT Class - 11 Biology Textbook: Amazon.in: Electronics

Important Terms On Mineral Nutrition

1. Autotroph: An organism that sythesize its required nutrients from simple and inorganic substance; Example-plants, blue green algae (cyanobacteria)
2. Heterotroph: An organism that cannot synthesise its own nutrients and depend on others. Example-Bacteria, protists, members of animalia.
3. Biological nitrogen fixation: Conversion of atmospheric nitrogen into organic compounds by living organisms.

DENITRIFICATION

A process of conversion of nitrate into nitrous oxide and nitrogen gas (N2).
Leg-hemoglobin: Pinkish pigment found in the root nodules of legumes.

Nitrification

1. Conversion of ammonia (NH3) into nitrite and then to nitrate.
It acts as oxygen scavenger and protects the nitrogenase enzyme from oxidation.
2. Mineral Nutrition: Plants require mineral elements for their growth and development. The utilization of various absorbed ions by a plant for growth and development is called mineral nutrition of the plant.
3. Hydroponics: Soil-less culture of plants, where roots are immersed in nutrient solution (without soil) is called hydroponics. The result obtained from hydroponics may be used to determine deficiency symptoms of essential elements.

FLUX

1. The movement of ions is called flux. Influx is inward movement of ions into the cells and efflux is the outward movement of ions.
2. Inhibition of cell division: Deficiency of N, K, S. and Mo.
3. Necrosis: Death of tissues particularly leaf tissue due to deficiency of Ca, Mg, Cu, K.
4. Delayed Flowering: due to deficiency of N, S, Mo.

Criteria for essentiality

1. The element must be necessary for supporting normal growth and reproduction.
2. Requirement must be specific and not replaceable by another element.
3. The element must be directly involved in the metabolism of the plant.

Important Terms related to Chapter 12

1. Chlorosis: Yellowing of leaves due to loss of chlorophyll.
2. Active Transport: Absorption occurring at the expense of metabolic energy.
3. Passive Transport: Absorption of minerals with concentration gradient by the process of diffusion without the expense of metabolic energy.

Important Questions On 11th Biology Chapter 12

‘All elements that are present in a plant need not be essential to its survival’. Comment.

Plants tend to absorb different kinds of nutrients from soil. However, a nutrient is inessential for a plant if it is not involved in the plant’s physiology and metabolism. For example, plants growing near radioactive sites tend to accumulate radioactive metals. Similarly, gold and selenium get accumulated in plants growing near mining sites. However, this does not mean that radioactive metals, gold, or selenium are essential nutrients for the survival of these plants.

Why is purification of water and nutrient salts so important in studies involving mineral nutrition using hydroponics?

Hydroponics is the art of growing plants in a nutrient solution in the absence of soil. Since the plant roots are exposed to a limited amount of the solution, there are chances that the concentrations of oxygen and other minerals in the plant roots would reduce. Therefore, in studies involving mineral nutrition using hydroponics, purification of water and nutrient salts is essential so as to maintain an optimum growth of the plants.

Explain with examples: macronutrients, micronutrients, beneficial nutrients, toxic elements and essential elements.

Macronutrients: They are the nutrients required by plants in large amounts. They are present in plant tissues in amounts more than 10 m mole kg–1 of dry matter. Examples include hydrogen, oxygen, and nitrogen.
Micronutrients: They are also called trace elements and are present in plant bodies in very small amounts, i.e., amounts less than 10 m mole kg– 1 of dry matter. Examples include cobalt, manganese, zinc, etc.
Beneficial nutrients: They are plant nutrients that may not be essential, but are beneficial to plants. Sodium, silicon, cobalt and selenium are beneficial to higher plants.
Toxic elements: Micronutrients are required by plants in small quantities. An excess of these nutrients may induce toxicity in plants. For example, when manganese is present in large amounts, it induces deficiencies of iron, magnesium, and calcium by interfering with their metabolism.
Essential elements: These elements are absolutely necessary for plant growth and reproduction. The requirement of these elements is specific and non-replaceable.
They are further classified as macro and micro-nutrients.

Name at least five different deficiency symptoms in plants. Describe them and correlate them with the concerned mineral deficiency.

The five main deficiency symptoms arising in plants are:
Chlorosis
Necrosis
Inhibition of cell division
Delayed flowering
Stunted plant growth
Chlorosis or loss of chlorophyll leads to the yellowing of leaves. It is caused by the deficiencies of nitrogen, potassium, magnesium, sulphur, iron, manganese, zinc, and molybdenum.
Necrosis is the death of plant tissues as a result of the deficiencies of calcium, magnesium, copper, and potassium.
Inhibition of cell division is caused by the deficiencies of nitrogen, potassium, sulphur, and molybdenum.
Delayed flowering is caused by the deficiencies of nitrogen, sulphur, and molybdenum.
Stunted plant growth is a result of the deficiencies of copper and sulphur.

If a plant shows a symptom which could develop due to deficiency of more than one nutrient, how would you find out experimentally, the real deficient mineral element?

In plants, the deficiency of a nutrient can cause multiple symptoms. For example, the deficiency of nitrogen causes chlorosis and delayed flowering.
In a similar way, the deficiency of a nutrient can cause the same symptom as that caused by the deficiency of another nutrient. For example, necrosis is caused by the deficiency of calcium, magnesium, copper, and potassium.
Another point to be considered is that different plants respond in different ways to the deficiency of the same nutrient.
Hence, to identify the nutrient deficient in a plant, all the symptoms developed in its different parts must be studied and compared with the available standard tables.

Why is that in certain plants deficiency symptoms appear first in younger parts of the plant while in others they do so in mature organs?

Deficiency symptoms are morphological changes in plants, indicating nutrient deficiency. Deficiency symptoms vary from one element to another. The plant part in which a deficiency symptom occurs depends on the mobility of the deficient element in the plant. Elements such as nitrogen, potassium, and magnesium are highly mobile. These elements move from the mature organs to the younger parts of a plant. Therefore, the symptoms for the deficiencies of these elements first appear in the older parts of the plant. Elements such as calcium and sulphur are relatively immobile. These elements are not transported out of the older parts of a plant. Therefore, the symptoms for the deficiencies of these elements first appear in the younger parts of the plant.

How are the minerals absorbed by the plants?

The absorption of soil nutrients by the roots of plants occurs in two main phases – apoplast and symplast.
During the initial phase or apoplast, there is a rapid uptake of nutrients from the soil into the free spaces of plant cells. This process is passive and it usually occurs through trans-membrane proteins and ion-channels.
In the second phase or symplast, the ions are taken slowly into the inner spaces of the cells. This pathway generally involves the expenditure of energy in the form of ATP.

What are the steps involved in formation of a root nodule?

Multiple interactions are involved in the formation of root nodules. The Rhizobium bacteria divide and form colonies. These get attached to the root hairs and epidermal cells. The root hairs get curled and are invaded by the bacteria. This invasion is followed by the formation of an infection thread that carries the bacteria into the cortex of the root. The bacteria get modified into rod-shaped bacteroides. As a result, the cells in the cortex and pericycle undergo division, leading to the formation of root nodules. The nodules finally get connected with the vascular tissues of the roots for nutrient exchange.

Details: Parent Category: student Corner; Category: NCERT Solutions for Class 11 Biology; Published: 16 May 2020; Hits: 82

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NCERT Solutions for Class 11 Biology