Lichens are compound plants as algae and fungi live together in close association, as a result of which both are benefited. This relationship is called symbiosis. They occur as greyish green growths on rocks, bark of the tree or on the ground.
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What are lichens?
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Rohit and his mother were walking in the garden. Rohit saw mushrooms growing on decaying leaves. He tried to uproot them. He was stopped by his mother. (𝒊) Where do you use mushrooms in daily life? (𝒊𝒊) Write the mode of nutrition exhibited by the mushrooms. (𝒊𝒊𝒊) Why did Rohit’s mother stop him?
Open Answer »During a field-trip, some students visited an agricultural farm and saw a few birds eating earthworms. They enjoyed the scene and then they also started picking and killing the earthworms for pleasure. The farmer strongly objected and asked them to leave the field. (𝒊) What could be the reason behind such a behaviour of the farmer? (𝒊𝒊) What values do you find missing in the student’s behaviour? (𝒊𝒊𝒊) Write two identifying features of earthworm.
Open Answer »Raman lives in a coastal village. He is the son of a fisherman. Whenever any unwanted animal comes in the net, instead of killing it, he puts it back in the sea. Answer the following questions based on above information: (𝒊) What would have happened, had he killed those animals? (𝒊𝒊) Give one reason to justify that Raman’s action is environment friendly. (𝒊𝒊𝒊) How can you contribute in the preservation of flora and fauna around you? Mention any two steps.
Open Answer »Two groups of biology students were doing field work of taxonomy in a compost heap. Group A noticed an organism. They noted down its characteristics and made a dichotomous key. Group B noticed another organism. But they instead of noting down the characteristics, photographed the organism. Answer the following questions based on the above situation: (𝒊) Which desired values are reflected in the approach used by Group A but ignored by Group B? (𝒊𝒊) In what way is the observation by Group B different from Group A? (𝒊𝒊𝒊) Which group would you like to be in and why?
Open Answer »Match items of column (A) with items of column (B).
| Column A (a) Naked seed (b) Covered seed (c) Flagella (d) Marchantia (e) Marsilea (f) Cladophora (g) Penicillium | Column B (A) Angiosperms (B) Gymnosperms (C) Bryophytes (D) Euglena (E) Thallophyta (F) Pteridophyta (G) Fungi |
Match items of column (A) with items of column (B).
| Column A (a) Pore bearing animals (b) Diploblastic (c) Metameric segmentation (d) Jointed legs (e) Soft bodied animals (f) Spiny skinned animals | Column B (A) Arthropoda (B) Coelenterata (C) Porifera (D) Echinodermata (E) Mollusca (F) Annelida |