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Read the following passage and answer the item that follows. Your answers to this item should be based on the passage only. Many farmers use synthetic pesticides to kill infesting insects. The consumption of pesticides in some of the developed countries is touching 3000 grams/hectare. Unfortunately, there are reports that these compounds possess inherent toxicities that endanger the health of the farm operators, consumers and the environment. Synthetic pesticides are generally persistent in environment. Entering in food chain they destroy the microbial diversity and cause ecological imbalance. Their indiscriminate use has resulted in development of resistance among insects to insecticides, upsetting of balance in nature and resources of treated populations. Natural pest control using the botanical pesticides is safer to the user and the environment because they break down into harmless compounds within hours or days in the presence of sunlight. Plants with pesticidal properties have been in nature for millions of years without any ill or adverse effects on the ecosystem. They are easily decomposed by many microbes common in most soils. They help in the maintenance of biological diversity of predators and human health hazards. Botanical pesticides formulated from plants are biodegradable and their use in crop protection is a practical sustainable alternative. On the basis of the above passage, the following assumptions have been made: 1. Synthetic pesticides should never be used in modern agriculture. 2. One of the aims of sustainable agriculture is to ensure minimal ecological imbalance. 3. Botanical pesticides are more effective as compared to synthetic pesticides. Which of the assumptions given above is/are correct?
Who among the following found that the application of synthetic auxins can bring about the development of an unpollinated ovary into a fruit?
While discussing about friction, a teacher gave a number of examples to explain the concept. Some of the examples where friction is useful in our day-to-day life as quoted by the teacher are given below : A. We are able to write because of friction between the tip of the pen and the paper. B. We are able to walk because of friction between our feet and the ground. C. A ball thrown vertically upwards comes back to us due to friction. D. We are able to stop a moving vehicle by applying brakes because of friction. The correct examples were
A social science teacher wants students to discuss the theme 'Equality'. Which of the following activities will be most suitable for this? A. Asking students to discuss about two examples she has already given in the previous class. B. Asking students to form small groups and work collectively to find out new examples for equality. C. Asking students to discuss examples wherein people have been treated unequally. Choose the correct option.
Which of the following are examples of effective learning strategies? i. Setting goals and time tables ii. Making organizational charts and concept maps iii. Thinking of examples and non-examples iv. Explaining to a peer v. Self-questioning
Which of the following plant hormones controls fruit ripening? A. Zeatin B. Auxins C. Gibberellic acid D. Ethylene
Which statement is incorrect about auxins?
Which of the following is/are growth inhibitors in plants? Auxins Abscisic acid Ethylene Gibberellins Cytokinins
Most auxins present in Avena coleoptile sections seem to be there through
Gibberellins differ from auxins since they produce