Q1. Which of the following statement is not correct regarding the Desert Biome?
- Very low rainfall region and low humidity.
- Vegetation includes cactus, sagebrush, euphorbias.
- The days and nights are very hot.
- Its fauna includes Reptiles, Mammals and Birds.
Correct Option: 3. The days and nights are very hot.
Explanation : Days are very hot and nights are cold. Very low and sporadic rainfall region and low humidity. Vegetation includes cactus, sagebrush, euphorbias. Its fauna includes Reptiles, Mammals and Birds.
Q2. Arrange the following from Primary producer to Tertiary consumer present in the “Grazing Food Chain”.
a. Caterpillar.
b. Snake.
c. Plant.
d. Frog.
which of the following arrangement is correct?
- c-a-d-b
- c-d-b-a
- c-d-a-b
- c-a-d-b
Correct Option: 1. c-a-d-b
Explanation : Food Chain is a sequence where one organism eats and being eaten by another.
Transfer of food energy takes place in the food chain. Plants are called Primary Producers
because they produce food with the process of Photosynthesis. Herbivores eats these plants
and hence called primary consumers. Caterpillar is an example of Herbivore. These caterpillars
are consumed by Frogs which are called secondary consumers. And these frogs are consumed
by snakes which are called Tertiary consumers. There are basically two types Food chains:-
(1) Grazing Food Chain.
(2) Detritus Food Chain.
Following image illustrates the sequence of Grazing Food Chain.
Q3. Which of the following distinguished the “Grazing Food Chain” from the “Detritus Food Chain”?
- Tertiary Consumers.
- Primary Source of Energy.
- Secondary Consumers.
- Presence in the Ecosystem.
Correct Option: 2. Primary Source of Energy.
Explanation : Primary source of Energy distinguished the Grazing Food Chain from the Detritus Food chain. In Grazing food chain, living plants/biomass are the primary source of energy. In Detritus food chain, dead organic material is the primary source of energy. Secondary consumers (lizard, frogs) and Tertiary Consumers (Snakes, Eagle) can be same for both the Food chains. And both the Food chains are naturally present in the Ecosystem/Environment. We have seen the example of Grazing Food chain in the above question. Following image illustrates the example of Detritus food chain: –
Q4. Which of the following statement is not correct?
- Food web consist multiple food chains.
- Removal of any organism can highly affect immediate organism in the Food chain.
- Food web provides alternative food for most of the organisms and hence increases the chance of survival.
- Food chain provides alternative food for most of the organisms and hence increases the chance of survival.
Correct Option: 4. Food chain provides alternative food for most of the organisms and hence increases the chance of survival.
Explanation : Food chain does not provide alternative food to the organism. If one organism is removed, then the immediate organism is badly affected in the food chain. There is a single path of transfer of food energy in the food chain, whereas there are multiple paths of transfer of food energy in Food web. Food web consists multiple food chains. Food web provides alternative food for most of the organisms and hence increases the chance of survival of an organism.
Q5. Which of the following is not a fish?
- Great White Shark.
- Dolphins.
- Salmon.
- Mackerel.
Correct Option: 2. Dolphins.
Explanation : Dolphin is not a fish, it is a cetacean. A cetacean is a water living mammal that has no hind limbs. They breathe air into their lungs. They cannot breathe underwater as they do not have gills as the fish do. They breathe through their nostrils, called a blowhole, located on their top of the head. Whale, Porpoises are the other examples of cetaceans.