Class 6 Science Chapter 6 MCQ

Here, are all the statements are correct. Hence, your answer will be option [D].

In plants, respiration, take place both during day and night. During daytime, all the carbon dioxide produced in respiration is used up by plants for photosynthesis and only oxygen produced during photosynthesis is released. The plants give out carbon dioxide produced in respiration only at night time.

All the animals need food, water, and air to survive or live, so all the animals (including human beings) are living things. Living things have many characteristics as they want food, air and water. Living things can respond to stimuli.

A new leaf coming out of a tree branch is not associated with reproduction. It is associated with growth. Reproduction is the process by which living things produce more of their own kind, Example – dog giving birth to puppy, seed growing into plant and chick hatching from egg.

Aquatic plant, fish, frog, insect represents only the biotic components of a habitat. The living things such as plants, animals and microorganisms in a habitat are known as its biotic components.

Roots of mango tree is odd one as it is not related to reproduction. The other options are directly linked to reproduction. Chickens are hatched from the eggs of hen. Many plants reproduce through seeds. Buds of potato tuber can grow to produce new potato plant.

Here, are all the statements are correct. Hence, your answer will be option [D].

Cultivated land with grazing cattle cannot be called a ‘habitat’. The cattle do not live in the cultivated land. They come there, only for feeding. A habitat is the surroundings where organisms live. It means a dwelling place i.e. aquatic habitats such as pond.

The carbon dioxide produced during respiration is also expelled from the body of the earth worm through its skin.

Features of desert plants that help them to survive there are: (i)Lose very little water through transpiration. (ii)Leaves are either absent, very small or reduced to spines. (iii) Stem is covered with thick waxy layer to retain water. (iv) Root grow very deep into the soil for absorbing water.

Excretion is the process of removal of waste substances from the body of a living organisms. The wastes include not just excess water but carbon dioxide, nitrogenous matter, feaces etc. It is an important characteristic of living organisms.

Potato stem tuber has many buds, called eyes on its body. One old potato tuber can produce many new potato plants. It is not necessary to plant the whole potato tuber in the soil to produce new potato plants. We can even plant cut pieces of potato in the soil to obtain new potato plants.

Reproduction is the characteristic of living organisms through which they produce more of their own kind. Thus, even after the organisms die, their kind continue to live on earth.

Here, are all the statements are correct. Hence, your answer will be option [D].

The living beings have some common characteristic that makes them different from the non-living. These are respiration, reproduction, adaptations, excretion, growth, nutrition and movement.

Earthworms breathe through their skin. Their skin is thin and moist with plenty of blood supply of exchanges of gases. The other options are used by other organisms such as gills-fishes, lungs-humans and stomata-plants.

The non-living things in a habitat called abiotic component. Such as rock, soil, air, water etc.

Here, are all the statements are correct. Hence, your answer will be option [D].

The process of becoming accustomed to a different environment over short periods is called acclimatisation. The changes which take place in the body of an organism during acclimatisation are temporary and can be reversed. On the other hand, the changes which take place during adaptation are permanent and cannot be reversed.

We can see many plants growing in the water of ponds, lakes, rivers and even drains. The two examples of completely submerged aquatic plants are “Hydrilla” and “Vallisneria”.

The place or surroundings where a plant or animal lives is called its habitat. Actually, habitat means a dwelling place or home. A habitat provides food, water, air, light, shelter or protection and a place for breeding to the plants and animals living in it. We can say, some of the examples of habitat are desert, mountain region, tree, pond, lake, river, ocean etc.

The fish has special organ of breathing called gills. The gills absorb oxygen dissolved in water.

Plants also respond to changes around them. In other words, plants also respond to stimuli. Plants respond to stimuli such as touch, sunlight, gravity, water and chemicals etc. We know that Mimosa plant which is commonly known as “sensitive plant” or “touch-me-not” plant. If we touch the leaves of a mimosa plant with our fingers, then its leaves fold up and droop. In this case, the touch of finger is the stimulus and the Mimosa plant responds by folding its leaves.

All the living things have a definite life span. Lifespan is the time period for which a living thing remains alive is called life span. No living things remain alive forever, except God. Thus, another characteristic of all living things is that they ultimately die.

The only characteristic of living things shown by wheat seeds is respiration. As when we put our hand deep inside a gunny bag full of wheat grains. We will find that it is some-what warm inside. This means that some heat is being produced inside the gunny bag full of wheat. Actually, the wheat grains or wheat seeds respire and give out some heat energy during respiration. So, we can say that seeds are living thing because they undergo respiration.