Write names of few thallophytes. Draw a labelled diagram of Spirogyra.
Ulothrix, Spirogyra, Cladophara, Ulva and Chara are few of the examples for Thallophytes They are usually found in moist or... View Article
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Name any two water pollutants which are toxic for plants and animals.
Pollutants like Arsenic and Lead are hazardous for plants and animals both. Arsenic leads to deformities by its accumulation in... View Article
Why is blood circulation in the human heart called double circulation?
The heart is the key organ for blood circulation and the double circulation is an efficient way of circulation as... View Article
How do the guard cells regulate opening and closing of stomatal pores?
The guard cells regulate the opening and closing of stomatal pores by the osmosis process. When water flows into the... View Article
In agricultural practices, higher input gives higher yield. Discuss how?
In agricultural practices, higher inputs give higher yield which means higher money input to raise the yield. Financial conditions of... View Article
Two-chambered heart occurs in (a) crocodiles (b) fish (c) aves (d) amphibians
(b) fish Explanation Crocodiles are reptiles and have three chambered hearts along with the amphibians as they have two atriums... View Article
Which is not an aquatic animal? (a) Hydra (b) Jellyfish (c) Corals (d) Filaria
d) filaria Explanation The organism’s hydra, jellyfish and corals all belong to the phylum Coelenterata. Filarial worm are parasitic in nature.... View Article
The slow process of conversion of dead vegetation into coal is called__________.
The Slow conversion of dead vegetation into coal is called carbonisation. Explanation Carbonisation is the term for the conversion of... View Article
Which is a thermosetting plastic? (a) Melamine (b) Polythene (c) PVC (d) Nylon
Melamine is a thermosetting plastic, as it cannot be re-shaped once it is being moulded in a particular shape. Melamine... View Article
Name two diseases caused by Protozoans. What are their causal organisms?
The two disease caused by protozoans are Sleeping sickness caused by Trypanosoma / Malaria by plasmodium Kala −− azar caused... View Article
Bison is an endemic fauna of Pachmarhi Biosphere Reserve. (True or False)
a) True Bison is an endemic fauna of Pachmarhi biosphere reserve, along with Indian wolf, Chinkara, Flying squirrels, Indian Giant... View Article
During summer, if you go near the lake, you feel relief from the heat, why?
At daytime, air over the land heats up, raises upward and creates an area of low pressure. The heating of lake... View Article
Nervous tissue is not found in (a) brain (b) spinal cord (c) tendons (d) nerves
c) Tendons Tendons are the connective tissue, which join skeletal muscles to bones, hence nervous tissue is absent is them.... View Article
Contractile proteins are found in (a) bones (b) blood (c) muscles (d) cartilage
c) Muscles Muscles have contractile proteins. The contraction and relaxation of these contractile proteins brings about the movement of body... View Article
The level of air pollution is higher at a busy traffic intersection. Why?
The level of air pollution is higher at a busy traffic intersection because a large number of cars, buses and... View Article
Differentiate between the following (ii) Mixed cropping and Inter cropping
Intercropping Mixed Cropping This cropping is done to utilise the space left between the rows of the main crop Mixed... View Article
Gymnosperms differ from Angiosperms in having covered seed. (True or False)
False Explanation Gymnosperms are the plants which are characterized by the naked seeds. Seeds develop on the scale of the leaf... View Article
Endocrine glands release hormones directly into___________for transportation to the __________.
Endocrine glands release hormones directly into the bloodstream for transportation to the target site. Hormones are chemicals that affect a lot... View Article
The eggs of fish are covered by hard shells for protection. (True or False)
False Eggs of fish are covered by a jelly-like substance for protection. Fish and amphibians generally lay eggs which are... View Article
External fertilisation can occur both in water and on land. (True or False)
False External fertilisation occurs only in water and not on land. Syngamy of gametes outside the female body/outer environment, notably... View Article
