Please select a subject first
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What is mutualism? Mention any two examples where the organisms involved are commercially exploited in modern agriculture.
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List any two adaptive features evolved in parasites enabling them to live successfully on their host?
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Mention any two significant roles of predation plays in nature.
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How does an orchid Ophrys ensure its pollination by bees?
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Water is very essential for life. Write any three features for plants that enable them to survive in a water-scarce environment.
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Why do submerged plants receive weak illumination than exposed floating plants in a lake?
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What is vivipary? Name a plant group that exhibits vivipary.
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How is rhytidome act as the structural defense by plants against fire?
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List out the effects of fire on plants.
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Give an account of various types of parasitism with examples.
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Match the following and choose the correct combination from the options given below:
| Column I (Interaction) | Column II (Examples) | ||
| I. | Mutualism | i) | Trichoderma and Penicillium |
| II. | Commensalism | ii) | Balanophora, Orobanche |
| III. | Parasitism | iii) | Orchids and Ferns |
| IV. | Predation | iv) | Lichen and Mycorrhiza |
| V. | Amensalism | v) | Nepenthes and Diaonaea |
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Generally, in summer, the forest area affected by natural fire. Over a period of time, it recovers itself by the process of successions. Find out the types of succession and explain.
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Various stages of succession are given below. From that rearrange them accordingly. Find out the type of succession and explain in detail.
Reed-swamp stage, phytoplankton stage, shrub stage, submerged plant stage, forest stage, submerged free-floating stage, marsh meadow stage.
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How do forests help in maintaining the climate?
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Select the incorrect statement from given statement
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Genetic engineering is
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The process of recombinant DNA technology has the following steps
- amplification of the gene
- Insertion of recombinant DNA into the host cells
- Cutting of DNA at a specific location using a restriction enzyme.
- Isolation of genetic material (DNA) Picks out the correct sequence of steps for recombinant DNA technology.
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Match the following:
| Column A | Column A | ||
| 1. | Exonuclease | a. | add or remove phosphate |
| 2. | Endonuclease | b. | binding the DNA fragments |
| 3. | Alkaline Phosphatase | c. | cut the DNA at terminus |
| 4. | Ligase | d. | cut the DNA at middle |
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Assertion: Agrobacterium tumifaciens is popular in genetic engineering because this bacteriumis associated with the root nodules of all cereals and pulse crops
Reason: A gene incorporated in the bacterial chromosomal genome gets automatically transferred to the cross with which bacterium is associated.
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How do you use the biotechnology in modern practice?
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