Class 6 Science, Chapter 10 (NCERT). 15 questions by concept, 15 with pictures. Open “Show answer” for the answer and why.
How to teach this chapter · Common misconceptions & worked visual for this chapter
A frog jumps when touched, and Drosera hairs move inward around an insect. Which complete set shows a response to a stimulus?
(d) Both the frog and the plant
Both the animal and the plant change in response to something around them. A response does not require the whole organism to change place.
What process is marked ? on the neem leaf?
(d) Breathing
The arrows show air moving in and out, described as breathing in this chapter. Plants exchange gases through openings such as stomata.
The drawing shows a flower bud on a plant. Which movement can follow?
(b) Flower opening
Plant parts can move while the whole plant remains rooted. In this example the movement is Flower opening.
A bean seed is placed in moist soil. Another bean seed is surrounded by excess water. Which condition is more suitable for germination, and why?
(d) Moist soil, because the seed can get the right amount of water and air.
Bean seeds require the right amount of water and air. Moist soil can provide water and air in the spaces between soil particles. Excess water can make air unavailable to the seeds.
A bean seed is in soil. The marked gaps around it are spaces between soil particles. Which statement correctly explains why these spaces matter for germination?
(d) Seeds use air available in the spaces between soil particles.
Seeds need air for germination. They use air available in the spaces between soil particles. These spaces also allow roots to grow easily.
Four pots contain bean seeds under the conditions shown. Which pot or pots are expected to germinate?
(d) Pot A and Pot B
Bean seeds need the right amount of water and air to germinate. In this setup, A has moist soil in the dark and B has moist soil in sunlight, so both have the needed water and air. Light is not essential for germination of bean seeds.
Two upright seedlings are compared. Seedling A receives sunlight from all directions. Seedling B receives sunlight from the right side only. Which statement matches the observed growth of the shoots and roots?
(b) A: shoot upward, root downwards; B: shoot right towards sunlight, root downwards.
With sunlight from all directions, the shoot grows upward. When sunlight comes from one direction, the shoot grows in the direction of light. In both cases, the root grows downwards.
A student predicts that a plant kept inverted will have the root and shoot continuing in their starting directions after one week. What is the error in this prediction?
(b) The root should bend and grow downwards, and the shoot should bend and grow upwards.
The observation was that in an inverted plant, the root bends and grows downwards while the shoot bends and grows upwards. The same rule is used for a plant along the ground: shoots grow upward, but roots grow downwards. The error is to make the root or shoot keep only the direction in which it was first placed.
An upright seedling receives sunlight from the right side only. Which prediction matches how its shoot and root will grow?
(a) Shoot grows right towards sunlight; root grows downwards.
The observed result was that when sunlight came from one direction, the shoot grew in the direction of light. The root continued to grow downwards. So the shoot grows right towards sunlight, while the root grows downwards.
Complete the mosquito life cycle shown by the arrows. Which labels replace Blank 1, Blank 2 and Blank 3, in order?
(d) larva, pupa, adult mosquito
The stages after egg are larva, pupa and adult. The adult female lays eggs, continuing the cycle.
Larvae in the drawing cannot reach the air. Which arrangement of kerosene could produce this blocked route?
(c) A thin layer on the water surface
Kerosene forms a thin layer at the surface. This layer prevents the young water stages from taking in air.
Kerosene oil is added to stagnant water containing mosquito larvae. What will happen to them?
(b) They die
Kerosene forms a surface layer that prevents the young stages from taking in air. Without this air supply, they die.
The figure shows two life-cycle changes, but the end stages are not shown. Which comparison correctly completes both changes?
(b) pupae change into insects; tadpoles change into frogs
The examples given are pupae changing into insects and tadpoles changing into frogs. Both examples show important changes during life cycles.
The figure compares three frog life-cycle stages. Which words should go in the cell marked ?
(d) tail lost completely and strong legs help it jump and land
The tadpole's tail helps it swim. Legs develop, the tail becomes shorter, and the adult frog eventually has no tail.
The marked stage still lives in water but begins to spend some time on land. How does this habitat use relate to the frog's development?
(d) Habitat use changes as the frog develops
A tadpole remains in water, while a froglet begins using land. Adult frogs use water and land, so habitat use changes during development.
Wrong
A moving toy car is alive.
Why it feels right. Movement is the easiest sign to spot.
Right
Living things show several life processes.
Worked example
