MCQs on Plant Growth And Development

Answer: C) Plants are grown in controlled environment

Explanation: A phytotron is a device that allows plants to be grown on a large scale under a variety of tightly regulated circumstances such as light, air & soil temperature, humidity, air water composition, and soil nutrient content. Separate controlled environment chambers, which are ubiquitous in most botanical labs, allow for more limited, small-scale environmental control. Both of these sorts of facilities can be quite useful in plant development experiments.

Answer: D) Human urine and rice seedlings

Explanation: Auxins, cytokinins, gibberellins, ethylene, and abscisic acid are five types of hormones that are also responsible for plant growth and development other than light, water, oxygen, minerals, and so on. Charles Darwin was the first to discover Auxin, which was isolated from human urine. They aid in the blossoming of plants and are utilised in the multiplication of plants, among other things. Cytokinins, on the other hand, are involved in cytokinesis and were discovered as Kinetins in herring sperm DNA. It isn't found in nature in plants.

Answer: D) Due to some secretion from tip

Explanation: When light strikes one side of the coleoptile, phototropins on that side become more active, forcing auxin to flow down the dark side. The tip of the coleoptile bends toward the light because the side with less auxin has fewer elongated cells, while the side with more auxin has more elongated cells.

Answer: D) Pomegranate (Anar) 

Explanation: Parthenogenesis is a type of asexual reproduction in which embryos grow and develop without being fertilised.In edible fruits with hard seeds, such as pineapple, eedlessness is seen as a desirable characteristic. Fruit crops that are difficult to pollinate or fertilise, such as fig, tomato, and summer squash, benefit from parthenocarpy.The seeds of the pomegranate are the only portion of the fruit that may be eaten. Because seeds are not accessible, if the same fruit develops as a consequence of parthenocarpy, it will be worthless.

Answer: B) They are expanded in the process & 

Explanation: Enzymes are biological catalysts that are created in one location and act in that location. They don't get used up at the conclusion of the reaction; they stay the same. Hormones are not catalysts, although they will start reactions that are created at the source and then act at the target location. They participate in the reaction and are so depleted in the end.

Answer: C) Both [a] and [b]

Explanation: Endocrine glands are ductless glands that produce hormones and release them straight into the circulation. An exocrine gland is a different sort of gland (e.g. sweat glands, lymph nodes). Because they do not generate hormones and discharge their product through a duct, they are not considered part of the endocrine system.

Answer: A) A phenomenon related to fruit ripening

Explanation: The climacteric stage of fruit ripening is marked by a surge in ethylene production and cellular respiration. Climacteric fruits include apples, bananas, melons, apricots, and tomatoes. Near the conclusion of fruit development, most plants have a rapid increase in respiration rate, which initiates the changes that occur during fruit ripening. The climacteric rise, or climacteric rise, is a rapid increase in respiration.

Answer: D) Aromatic compounds

Explanation: Plant hormones are molecules that influence plant development and are predominantly aromatic compounds. They are plant-produced signal molecules that exist in extremely low quantities. Hormones control cellular activities in certain cells and then migrate to other parts of the plant where they are needed. Hormones also control the growth and ripening of fruit, as well as the production of flowers, stems, and leaves, as well as the shedding of leaves.

Answer: B) Physiological functions

Explanation: Plant growth and development are regulated by phytohormones. Indole-3-acetic acid, cytokinin, gibberellin, ethylene, and abscisic acid have all been identified as plant hormones. Plants generate substances that control their growth, development, reproductive activities, lifespan, and even death. These tiny chemicals are produced by secondary metabolism and are responsible for plants' response to external stimuli.

Answer: B) Hormones

Explanation: Hormones are molecules produced by cells in a specific region of the plant. The activity and impact of that material, on the other hand, will occur in another section of the plant and will be generated in a very little amount. They are a kind of plant hormone that resembles morphogens in certain ways. They are important for plant body development and play a critical role in the coordination of various growth and behavioral processes in plant life cycles.

Answer: C) Gas chromatography

Explanation: The separation of phytohormones can be accomplished using gas chromatography. Gas chromatography is a form of analytical chemistry chromatography that is used to separate and analyse substances that may be evaporated without breakdown. GC is commonly used to determine the purity of a chemical or to separate the various components of a combination. In rare cases, GC can aid in the identification of a substance. GC may be used to separate pure substances from a mixture in preparative chromatography.

Answer: B) Phytohormones

Explanation: Phytohormones are the name for plant hormones. Several metabolic functions of the plant, such as cell differentiation and cell elongation, are accelerated by these compounds. Auxins stimulate cell elongation, cytokinin promotes cell division, gibberellin aids in stem elongation, ethylene aids in fruit ripening, and ABA aids the plant's stress adaptation.

Answer: a) Apical meristem

Explanation: Root apical meristems or shoot apical meristems govern primary growth, whereas the two lateral meristems, the vascular cambium and the cork cambium, control secondary growth. Apical meristems are a type of meristematic tissue found at the terminals of stems and roots that allows a plant to grow longer. The root and shoot tips of plants have an apical meristem, which is an area of cells capable of division and development. Apical meristems give birth to the basic plant body and are in charge of root and shoot expansion.