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Which of the following statements are true? (i) Sudden action in response to something in the environment is called reflex action (ii) Sensory neurons carry signals from the spinal cord to muscles (iii) Motor neurons carry signals from receptors to the spinal cord (iv) The path through which signals are transmitted from a receptor to a muscle or a gland is called the reflex arc (a) (i) and (ii) (b) (i) and (iii) (c) (i) and (iv) (d) (i) , (ii) and (iii)

(c) (i) and (iv) Reflex action is a sudden and involuntary response to stimuli. It helps organisms to quickly adapt to an adverse circumstance... View Article

A nail is inserted in the trunk of a tree at a height of 1 metre from the ground level. After 3 years the nail will (a) move downwards (b) move upwards (c) remain at the same position (d) move sideways

C) Remain at the same position The plant grows in length by apical meristems. Apical meristem is present on the tip of root and shoot. A nail is... View Article

In which of the following groups of organisms, food material is broken down outside the body and absorbed? (a) Mushroom, green plants, Amoeba (b) Yeast, mushroom, bread mould (c) Paramecium, Amoeba, Cuscuta (d) Cuscuta, lice, tapeworm

b) Yeast, Mushroom, Bread mould Organism like - Mushroom, Yeast, and Bread mould are saprophytic. They break down food outside the body and... View Article

Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. The occasion is called (a) forest Conservation Day (b) plantation month (c) Van Mahotsav (d) wildlife week

(c) Van Mahotsav Van Mahotsav week is celebrated in the first week of July and plantation drives are carried out across the country. India has... View Article

Find out the false sentences (a) Golgi apparatus is involved with the formation of lysosomes (b) Nucleus, mitochondria and plastid have DNA; hence they are able to make their own structural proteins (c) Mitochondria is said to be the powerhouse of the cell as ATP is generated in them. (d) Cytoplasm is called as protoplasm

d) Cytoplasm is called as protoplasm. It is a false statement. Along with the function of secretion of various enzyme proteins and producing... View Article

Unscramble the underlined words in the following sentences. (a) Reproductive life of a woman lasts from hacreemn to spauoemen. (b) The development of a caterpillar to an adult butterfly is termed as poommertaissh. (c) The overgrowth of sumselc in xalnyr leads to the hoarse voice in adolescent boys. (d) Dannalier helps the body to adjust and fight the stress.

(a) Reproductive life of a woman lasts from menarche to menopause. In males and females, the reproductive stage commences at puberty. The... View Article

The place meant for the conservation of biodiversity in their natural habitat are (i) Zoological garden (ii) Botanical garden (iii) Wildlife sanctuary (iv) National park (a) i & ii; (b) ii & iii; (c) iii & iv; (d) i & iv

c) ii and iv Wildlife sanctuary, national parks are in situ conservation methods of biodiversity. These places are meant for conservation of... View Article

You are provided with three watch glasses containing milk, petrol and mustard oil, respectively. Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why?

Petrol will catch fire instantly because it is highly inflammable. Mustard oil and milk has very high ignition temperature. So, they will not... View Article

PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Can you write the major difference between these two types of plastics?

Thermoplastic Thermosetting Plastic Thermoplastic can be synthesized by the process called addition polymerization. Thermosetting plastics... View Article

Arrange these statements in correct sequence of preparation of green manure. (a) Green plants are decomposed in soil. (b) Green plants are cultivated for preparing manure or crop plant parts are used. (c) Plants are ploughed and mixed into the soil. (d) After decomposition it becomes green manure.

The correct sequence for preparation of green manure is, b) Green plants are cultivated for preparing manure or crop plant parts are used. c)... View Article

Which of the following feature is correct for a wildlife sanctuary? (a) It is an artificially created protected area for animals. (b) It is a protected area for threatened and endangered wild animals. (c) It is meant for the conservation of only plant species. (d) Capturing and poaching of animals is strictly prohibited here.

(a) It is an artificially created area for animals protection A wildlife sanctuary is an area where animal habitats and their surroundings are... View Article

Observe the chart and graph given in Fig. carefully and answer the following questions. (a) Which of the line represents the height of boys? (b) Which line represents the height of girls? (c) What is the difference between the pattern of increase in the height of boys and girls? (d) Is this pattern true for each individual?

(a) The red line represents the height of boys. (b) The blue line represents the height of girls. (c) At the onset of puberty, girls grow... View Article

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 elements. (b) Fodder... 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 of an organ such as leaves and... 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 It consists of pillar-like cells with their nuclei towards the base. They form the lining of stomach, small intestine... 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 The criteria for classification of organisms are as follows- Nature of cell (prokaryotic or eukaryotic) Number of cells... 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 because the force of... 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 is restricted to a confined... 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... 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 membrane.... View Article

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