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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. When food goes into the food pipe, the muscles in its walls start to alternate... 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 digestive... 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 The molars are the largest teeth of all. The premolars present next to molars. Molars are 12 in number, whereas... 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) If starch is mixed with iodine, it gives a blue-black colour. The boiled and mashed potato and a 'slice of bread' contain... 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 rely on other sources,... 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 ( heterotroph,... 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 as zebra, goat, deer,... 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 minerals. (c) Available in the... 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 wheat dough encourage... 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 because... 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 extracting nutrients. In some cases, the... 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 days. If leaves are absent, the stored... 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. During the photosynthesis process, light energy gets converted into... 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 their food by the procedure of... 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 The carbon dioxide is used as a raw material for the photosynthesis process in plants to prepare food and release... 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 Symbiosis refers to the close relationship amongst two different organisms or living things belonging to different... View Article

When we observe the lower surface of a leaf through a magnifying lens we see numerous small openings. Which of the following is the term given to such openings? (a) Stomata (b) Lamina (c) Midrib (d) Veins

a) Stomata Stomata are the tiny openings present on the epidermis of leaves. We can see stomata under the light microscope. In some of the... View Article

The term that is used for the mode of nutrition in yeast, mushroom and bread-mould is (a) autotrophic (b) insectivorous (c) saprophytic (d) parasitic

c) Saprophytic In saprotrophic mode of nutrition, the vital nutrients required for their body are collected from dead and decaying matter. The... View Article

Pitcher plant traps insects because it (a) is a heterotroph. (b) grows in soils which lack nitrogen. (c) does not have chlorophyll. (d) has a digestive system like human beings.

(b) grows in soils which lack nitrogen. Pitcher plants trap insects in its modified trap-like organ to fulfil its requirements of Nitrogen and... View Article

Which of the following statements is/are correct? (i) All green plants can prepare their own food. (ii) Most animals are autotrophs. (iii) Carbon dioxide is not required for photosynthesis. (iv) Oxygen is liberated during photosynthesis. Choose the correct answer from the options below: (a) (i) and (iv) (b) (ii) only (c) (ii) and (iii) (d) (i) and (ii)

a) (i) and (iv) All green plants can prepare their own food by the process called photosynthesis. Carbon dioxide and water required for the... View Article

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