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The false feet of Amoeba is used for (a) movement only. (b) the capture of food only. (c) the capture of food and movement. (d) exchange of gases only.

c) Capture of food and movement Explanation Option A: Amoeba uses pseudopodia for ingestion also. Therefore, this is the incorrect... View Article

Read the following statements with reference to the villi of the small intestine. (i) They have very thin walls. (ii) They have a network of thin and small blood vessels close to the surface. (iii) They have small pores through which food can easily pass. (iv) They are finger-like projections. Identify those statements which enable the villi to absorb digested food. (a) (i), (ii) and (iv) (b) (ii), (iii) and (iv) (c) (iii) and (iv) (d) (i) and (iv)

a) (i), (ii) and (iv) Explanation Inner walls of the small intestine have thousands of finger-like outgrowths called villi (singular villus).... View Article

The finger-like outgrowths of Amoeba help to ingest food. However, the finger-like outgrowths of human intestine help to (a) digest the fatty food substances. (b) make the food soluble. (c) absorb the digested food. (d) absorb undigested food.

(c) absorb the digested food. Explanation Vili are finger-like outgrowths of the human intestine. The main role of villi is... View Article

The acid present in the stomach (a) kills the harmful bacteria that may enter along with the food. (b) protects the stomach lining from harmful substances. (c) digests starch into simpler sugars. (d) makes the medium alkaline.

a) Kills the harmful bacteria that may enter along with the food Explanation The acid present in the stomach is... View Article

The swallowed food moves downwards in the alimentary canal because of (a) force provided by the muscular tongue. (b) the flow of water taken with the food. (c) gravitational pull. (d) the contraction of muscles in the wall of the food pipe.

d) The contraction of muscles in the wall of food pipe. Explanation When food goes into the food pipe, the muscles... View Article

Read carefully the terms given below. Which of the following set is the correct combination of organs that do not carry out any digestive functions? (a) Oesophagus, Large Intestine, Rectum (b) Buccal cavity, Oesophagus, Rectum (c) Buccal cavity, Oesophagus, Large Intestine (d) Small Intestine, Large Intestine, Rectum

Answer is (a) Oesophagus, Large Intestine, Rectum Explanation: Oesophagus pushes the food downwards and it is not involved in any... View Article

Which of the following pair of teeth differ in structure but are similar in function? (a) canines and incisors. (b) molars and premolars. (c) incisors and molars. (d) premolars and canines.

b) Molars and premolars Explanation The molars are the largest teeth of all. The premolars present next to molars. Molars... View Article

Given below from (i) to (iv) are some food items. i) Boiled and mashed potato ii) Glucose solution iii) A slice of bread iv) Mustard oil Which of the above will give blue-black colour when tested with iodine? (a) (i) and (ii) (b) (i) and (iii) (c) (ii) and (iii) (d) (iii) and (iv)

b) (i) and (iii) Explanation If starch is mixed with iodine, it gives a blue-black colour. The boiled and mashed potato... View Article

Can you give me a name? Solve each of the following riddles by writing the name of the organism and its mode of nutrition. One riddle is solved to help you. (a) I am tall but I cannot move. I am green and can prepare my own food. tree, autotroph (b) I live in water; people keep me in an aquarium and feed me. , (c) I am small and I can fly. I disturb your sleep, bite you and suck your blood which is my food. , (d) I am white and soft. I grow well in the rainy season. Children pluck me from the ground and admire me. I absorb nutrients from decomposed dead parts of plants and animals in the soil. ,.

(b) fish, heterotroph A heterotroph is an organism that is unable to synthesize its own food, and therefore, has to... View Article

Spot as many organisms as possible in the puzzle given as Figure by encircling them as shown. Write the names on a sheet of paper and categorise them into autotrophs and heterotrophs. Classify the heterotrophs into herbivores, carnivores, omnivores and saprophytes.

First row: Crow ( Heterotroph, Carnivore ) Second Row: Bhindi ( Autotroph) Third row: ginger ( Autotroph) Fourth row: Cow... View Article

Wild animals like tiger, wolf, lion and leopard do not eat plants. Does this mean that they can survive without plants? Can you provide a suitable explanation?

Wild animals like tiger, wolf, lion, and leopard do not eat plants. Wild animals hunt and eat herbivorous animals such... View Article

Sunlight, chlorophyll, carbon dioxide, water and minerals are raw materials essential for photosynthesis. Do you know where they are available? Fill in the blanks with the appropriate raw materials. (a) Available in the plant : _______ (b) Available in the soil : _, _ (c) Available in the air : _ (d) Available during day : _________

The appropriate raw materials are: (a) Available in the plant : chlorophyll (b) Available in the soil : water and... View Article

Wheat dough is left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason.

Wheat dough if left unwrapped for few days, the reproduction of yeast and formation of fungus takes space. Carbohydrates in... View Article

Nitrogen is an essential nutrient for plant growth. But farmers who cultivate pulse crops like green gram, bengal gram, black gram, etc. do not apply nitrogenous fertilizers during cultivation. Why?

Farmers who cultivate pulse crops like green gram, Bengal gram, black gram, etc. do not apply nitrogenous fertilizers during cultivation... View Article

Unscramble the following to form terms related to modes of nutrition. (i) RASPAEIT (ii) ROPEHYTSAP (iii) TOROPHAUT (iv) SIBIOMSYS

(i) PARASITE A parasite is a plant or an animal that lives on, or with, or inside a larger species... View Article

A goat eats away all the leaves of a small plant (balsam). However, in a few days, new leaves could be seen sprouting in the plant again. How did the plant survive without leaves?

In plants, if the leaves are not present there to produce food then plants can easily survive for a few... View Article

Photosynthesis requires chlorophyll, and a few other raw materials. Add the missing raw materials to the list given below: Water, minerals, _, __.

Photosynthesis requires Water, Minerals, Carbon dioxide, and Sunlight. Explanation During the photosynthesis process, light energy gets converted into chemical energy,... View Article

Potato and ginger are both underground parts that store food. Where is the food prepared in these plants?

Shoot system and leaves of a potato and a ginger are on the upper side of the ground. They prepare... View Article

Which of the following raw material is available in the air for photosynthesis? (a) Oxygen (b) Carbon dioxide (c) Nitrogen (d) Hydrogen

b) Carbon dioxide Explanation The carbon dioxide is used as a raw material for the photosynthesis process in plants to... View Article

Two organisms are good friends and live together. One provides shelter, water, and nutrients while the other prepares and provides food. Such an association of organisms is termed as (a) saprophyte (b) parasite (c) autotroph (d) symbiosis

d) Symbiosis Explanation Symbiosis refers to the close relationship amongst two different organisms or living things belonging to different species.Lactobacillus... View Article

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