Correct Answer: C. cause diseases in plants and animals

Explanation

Plant viruses are of considerable economic importance because many of them infect crop and ornamental plants.

Numerous plant viruses are rodlike and can be extracted readily from plant tissue and crystallized.

Animal viruses of economic importance: Genetic variation, persistence, and prospects for their control.

Correct Answer: B) aestivation

Explanation

This question is asking about the term used to describe the way animals adapt to very dry conditions in their environment. The options are hibernation, aestivation, rejuvenation, and xeromorphism. Hibernation is a state of inactivity that some animals enter during the winter to conserve energy. This is not the correct answer to the question. Rejuvenation refers to the process of restoring something to a former state of vitality or freshness. This is not the correct answer to the question. Xeromorphism is a term used to describe plants that are adapted to living in very dry conditions. This is also not the correct answer to the question. The correct answer is aestivation. Aestivation is a state of dormancy that some animals enter during hot and dry periods to conserve water and energy. This allows them to survive until more favorable conditions return. In summary, physiological adaptation to very dry conditions in animals is called aestivation. It is a state of dormancy that some animals enter during hot and dry periods to conserve water and energy.

Correct Answer: A. an increase in the sugar content of guard cells

Correct Answer: D. species

Correct Answer: A) saprophytic nutrition involves feeding on a soluble organic material from inorganic substances

Explanation

This question is asking us to identify the statement that is not true among the given options. Option A states that saprophytic nutrition involves feeding on a soluble organic material from inorganic substances, and this is correct. Saprophytic nutrition is a type of nutrition in which an organism feeds on dead and decaying organic matter, releasing enzymes to break down the matter into smaller soluble organic compounds that can be absorbed. Option B states that symbiosis is a nutritional relationship in which both organisms involved derive benefit, and this is also true. Symbiosis is a type of relationship in which two organisms of different species live in close association, and both organisms benefit from the interaction. Option C states that a parasite causes injuries to its host in the course of getting its food, and this is also true. Parasites are organisms that live in or on another organism, known as the host, and obtain their food from the host. In the process, they often cause harm or injury to the host. Option D states that holozoic mode of nutrition can be seen in animals, carnivorous plants, and some protists, and this is also true. Holozoic nutrition is a type of nutrition in which an organism ingests solid food and then digests it internally. This mode of nutrition is seen in animals, carnivorous plants, and some protists. Therefore, the statement that is not true among the given options is Option A, as it is actually a true statement.

Correct Answer: A. glomerulus ---> Bowman's capsule -> convoluted tubule ---> Henle's loop -> collecting- tubule

Correct Answer: C) Insulin

Explanation

The question is asking which hormone regulates the amount of sugar in the blood. The options are Thyroxine, Auxin, Insulin, and Adrenalin. The correct answer is option C: Insulin. Insulin is a hormone produced by the pancreas that regulates the amount of glucose in the blood. Glucose is a type of sugar that is important for providing energy to the body's cells. When there is too much glucose in the blood, insulin is released to help the body absorb the excess glucose and store it in the liver and muscles. This helps to lower the amount of glucose in the blood. When there is too little glucose in the blood, the pancreas stops releasing insulin, which allows the liver to release stored glucose into the blood to increase blood sugar levels. Thyroxine is a hormone produced by the thyroid gland that helps to regulate metabolism and growth. Auxin is a plant hormone that helps to regulate growth and development. Adrenaline is a hormone produced by the adrenal glands that helps to prepare the body for the fight or flight response during times of stress. It is important to maintain a balance of glucose in the blood to ensure that the body's cells have enough energy to function properly. When there is too much or too little glucose in the blood, it can lead to health problems such as diabetes.

Correct Answer: C. intensity of light

Correct Answer: A. Filtration

Correct Answer: D. there is no exchange of genetic materials