Unit Test- I
Based On chapters 1 to 4
7th Science IMOPRTANT Q&A(Semi) for Unit Test-I
Q.1. Find my match!
'A' Group 'B' Group
(1) Lotus (a) flower and leaves attract insects
(2) Aloe (b) Haustorial roots for absorption of food
(3) Cuscuta (c) Adapted to live in deserts
(4) Venus flytrap (d) Adapted to live in water.
(5) Air (e) Plasticity
(6) Water (f) Scattering of light.
(7) Soil (g) Excretion
(8) Parasitic plant (h) Mushroom
(9) Insectivorous plant (i) Lichen
(10) Saprophytic plant (j) Drosera
(11) Symbiotic plant (k) Cuscuta
Answer:
(1) Lotus: - (d) Adapted to live in water.
(2) Aloe: - (c) Adapted to live in deserts
(3) Cuscuta: - (b) Haustorial roots for absorption of food
(4) Venus flytrap: - (a) flower and leaves attract insects
(5) Air: - (f) Scattering of light.
(6) Water: - (g) Excretion
(7) Soil: - (e) Plasticity
(8) Parasitic plant: - (k) Cuscuta
(9) Insectivorous plant: - (j) Drosera
(10) Saprophytic plant: - (h) Mushroom
(11) Symbiotic plant: - (i) Lichen
Q.2. Who is lying?
(a) Cockroach - I have five legs.
Cockroach is lying, cockroach has six legs.
(b) Hen: My toes are webbed.
Hen is lying, her toes are not webbed.
(c) Cactus My fleshy, green part is a leaf.
Cactus is lying, it`s fleshy, green part is a stem.
Q.3. State whether the following statements are true or false.
(a) Sandy soil has low capacity for holding water. - True
(b) The substance in which a solute dissolve is called a solvent. - True
(c) The pressure exerted by air is called atmospheric pressure. - True
(d) Sea water is bad conductor of electricity. - False
Q.4. Answer the following.
(a) Why is the camel called the 'Ship of the desert'?
-Answer: The skin of a camel is thick. the legs are long with cushioned soles. there is a fold of skin for protection of nostrils. the eyelashes are long and thick and thus, they protect the eyes. Fat is stored in its hump, due to which it can survive for a long time without water. Due to all of such adaptations, camel becomes most suitable to walk in the desert. Thus it is used as a means of transport and is called `ship of the desert`.
(b) Explain the various properties of water.
Answer: Water has following properties:
Fluidity: Water has the property of fluidity, due to which it can flow. Water is therefore used for transport and for generation of electricity.
Coolant: It can cool the heated equipments/ parts of machines.
Universal solvent: Almost all things dissolve in water and hence it is called universal solvent.
Cleaning abilities: Water can clean almost everything and hence it is used inn our daily routine.
(c) What are the various uses of soil?
Answer: Uses of soil are as bellow:
Soil helps plants to grow. Soil has water holding capacity. therefore water is available for us , through out the year. plasticity is the property due to which soil can be given any required shape. therefore, various articles are made from soil. they are baked and made hard for longer use. e.g., pots, lamps, idols, bricks, etc.
(d) Explain the various steps of nutrition in animals.
Answer: The five steps which occur in the process of nutrition in animals are Ingestion, Digestion, Absorption, Assimilation, Egestion.
Q.5. Give examples of 3 plants that have:
(a) spiny fruits – Caster, jack fruit, dhatura
(b) spiny stem – Silk cotton tree, cactus, silk floss tree
(c) red flowers – Flame of the forest, hibiscus
(d) yellow flowers – Yellow canna, golden trumpet tree, golden shower tree
(e) leaves which close at night – Rain tree, amla, gulmohur
(f) single-seeded fruits – Cashew, berries, mango
(g) many-seeded fruits – Water-melon, jack fruit, guava
Q.6. Fill in the blanks with the appropriate term.
(shape, temperature, mass, volume, humidity, acidic, weight, neutral, density.)
(a) The capacity of air to hold moisture depends upon the temperature of the air.
(b) Water does not have a shape but has definite
(c) While freezing, the density of water is lowered.
(d) Neutral soil has pH 7.
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