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Fill in the blanks (a) Pigeon pea is a good source of . (b) Berseem is an importantcrop. (c) The crops which are grown in rainy season are calledcrops. (d) are rich in vitamins. (e) __ crop grows in winter season.

(a) Protein The pigeon pea plant is extensively cultivated in different parts of India. Pigeon Peas are high in nutritional... View Article

If the tip of sugarcane plant is removed from the field, even then it keeps on growing in length. It is due to the presence of (a) cambium (b) apical meristem (c) lateral meristem (d) intercalary meristem

(d) intercalary meristem Stem located at the base of leaves or nodes and leads to the increase in the length... View Article

Intestine absorbs the digested food materials. What type of epithelial cells are responsible for that? (a) Stratified squamous epithelium (b) Columnar epithelium (c) Spindle fibres (d) Cuboidal epithelium

b) Columnar epithelium Explanation It consists of pillar-like cells with their nuclei towards the base. They form the lining of... View Article

Which of the following is not a criterion for the classification of living organisms? (a) Body design of the organism (b) Ability to produce one’s own food (c) Membrane-bound nucleus and cell organelles (d) Height of the plant

d) Height of the plant Explanation The criteria for classification of organisms are as follows- Nature of cell (prokaryotic or... View Article

A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement? (a) Water, air, wind (b) Air, sugar, oil (c) Oxygen, water, sugar (d) Salt, juice, air

(c) The correct order of increasing ‘force of attraction’ between their particles is Oxygen < Water < Sugar It is... View Article

Which one of the following statements is true about endemic species? (a) They are found exclusively in a specific habitat. (b) Endemic species can never become endangered. (c) They are found only in zoos and botanical gardens. (d) They are not affected by the destruction of their habitat.

The correct statement is (a) They are found exclusively in a specific habitat. An endemic species is a species which... View Article

Find out incorrect sentence (a) Protista includes unicellular eukaryotic organisms (b) Whittaker considered cell structure, mode and source of nutrition for classifying the organisms in five kingdoms (c) Both Monera and Protista may be autotrophic and heterotrophic (d) Monerans have a well-defined nucleus

(d) Monerans have a well-defined nucleus Kingdom-Monera comprises single celled prokaryotic bacteria, filamentous Actinomycetales and photosynthetic blue-green algae. Since, they... View Article

Following are a few definitions of osmosis. Read carefully and select the correct definition (a) Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane (b) Movement of solvent molecules from its higher concentration to lower concentration (c) Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane (d) Movement of solute molecules from lower concentration to a higher concentration of solution through a semipermeable membrane

(a) Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable... View Article

Observe the following figures. i) Identify the stages a to d in Fig. during the development of the human baby. ii) Arrange the stages in the correct sequence of development. iii) Explain the development that takes place in any one stage.

(i) (a) Embedding of the embryo in the uterus. (b) Fertilisation. (c) Zygote formation and development of an embryo from... View Article

Match the names of scientists given in Column A with the discovery made by them given in Column B. Column A – Column B (a) Louis Pasteur – (i) Penicillin (b) Robert Koch – (ii) anthrax bacterium (c) Edward Jenner – (iii) Fermentation (d) Alexander Fleming – (iv) small pox vaccine

The correct matching for the given question is as follows- (a) Louis Pasteur – (iii) Fermentation (b) Robert Koch –... View Article

Amoeba is a _____ celled organism. It reproduces by _ reproduction. The process of reproduction begins by the division of its _ into two. This is followed by the division of its _ into two. This type of reproduction is called _______ fission. Fill up the blanks with the terms: (body. asexual, binary, single, nucleus)

Amoeba is a single celled organism. It reproduces by asexual reproduction. The process of reproduction begins by the division of its nucleus... View Article

Given below are events that lead to pregnancy and development of the embryo. i) Fertilization of egg ii) Maturation of egg iii) Release of egg iv) Embedding of the embryo in the thickened uterine wall. Which of the following options gives the correct order of sequence in which they occur? (a) i, ii, iii, iv, (b) ii, i, iii, iv (c) i, iv, ii, iii (d) ii, iii, i, iv

d) ii, iii, i, iv The sequence of events is as follows: 1. Maturation of egg after puberty. 2. Release... View Article

Read the statements given below. (i) Seeds require moisture for germination. (ii) Plants can absorb nutrients mostly in dissolved form. (iii) Irrigation protects crops from both frost and hot air currents. (iv) Irrigation improves soil texture. Choose the combination of statements which indicate the need to irrigate crops. (a) i and ii (b) i, ii, iii (c) i, ii, iii, iv (d) i and iii

(a) i and ii Irrigation is necessary because water is required for germination of seeds. It is the supply of... View Article

Which of the following statements are true about the brain? (i) The main thinking part of the brain is the hindbrain (ii) Centres of hearing, smell, memory, sight etc are located in forebrain. (iii) Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hindbrain (iv) Cerebellum does not control the posture and balance of the body (a) (i) and (ii) (b) (i), (ii) and (iii) (c) (ii) and (iii) (d) (iii) and (iv)

c) (ii) and (iii) Explanation On average, an adult brain weighs between 1.0 kg – 1.5 kg. It is mainly... View Article

Following are a few organisms (a) lichen (b) mosses (c) mango tree (d) cactus Which among the above can grow on stones; and also help in the formation of soil? Write the mode of their action for making soil.

Lichens and mosses grow on rocks. Lichens and mosses release chemical substances which break down the stones resulting in the... View Article

Differentiate the following activities on the basis of voluntary (V) or involuntary (I V) muscles. (a) Jumping of frog (b) Pumping of the heart (c) Writing with hand (d) Movement of chocolate in your intestine

Voluntary : a) Jumping of frog c) Writing with hand Involuntary : b) Pumping of the heart d) Movement of... View Article

Name the hormone which would be released during the following situations: (a) a frightened person. (b) growth of a child to an adult. (c) development of caterpillar to moth. (d) development of tadpole to frog.

a. Adrenaline. It is secreted by adrenal gland during emergency situations. It helps us to face the situation or flight... View Article

Identify the correct statement about cells. (a) All the cells have nucleus. (b) Cells of an organ have similar structure. (c) Cells of tissue have a similar structure. (d) The shape of all types of cells is round.

c) Cells of a tissue have similar structure. Only eukaryotic cells have well-defined nucleus, hence option a) is wrong. Cells... View Article

Paddy is a major cereal crop in our country. (a) In which season is paddy cultivated? (b) Discuss the method of sowing. (c) What measures must be taken to prevent spoilage and insect attack of harvested grains?

a) Paddy is cultivated in rainy season as it is a Kharif crop. b) For sowing paddy seeds are first... View Article

Fill in the blanks. (a) A place where animals are protected in their natural habitat is called _____ . (b) Species found only in a particular area is known as _ . (c) Migratory birds fly to faraway places because of ________ changes.

a) A place where animals are protected in their natural habitat is called wildlife sanctuary. A wildlife sanctuary is an... View Article

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