Class 6 Science Chapter 6 MCQ

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.

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

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.

If we see our favourite food, our mouth starts watering. In this case, the site of favourite food is the stimulus and watering of mouth is our response to it.

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.

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

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 animal having a stream-lined and slippery body lives in water habitat. These are adaptation to survive in water. Stream-lined bodies reduce resistance due to water and help in swimming. The slippery body makes movement through water easier. The other adaptations of these animals are gills for breathing, flat fins, tails etc.

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 process by which living organisms produce new members of their species is called reproduction. A small part of a plant which is removed by making a cut with a sharp knife is called cutting. The cutting should be made in such way that there are some buds means growing points on it which is very necessary to grow a new plant.

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.

Small part of plant which is removed by making a cut with a sharp knife is called a cutting. The plants such as rose, henna, grapes, sugarcane and cactus etc. can be grown by the cutting method. Wheat cannot be reproducing by cutting.

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.