Question 1

Q1: Complete the following table \begin{tabular}{|c|l|c|l|}\hline S.No. & Feature & Photosynthesis & Respiration \\hline 1. & Raw materials & & \\hline...

Accepted Answer

\begin{tabular}{|c|l|l|l|} \hline S.No. & Feature & Photosynthesis & Respiration \ \hline 1. & Raw materials & Carbon dioxide, Water & Glucose, Oxygen \ \hline 2. & Products & Glucose, Oxygen & Carbon dioxide, Water, Energy \ \hline 3. & Word equation & Carbon dioxide + Water $\xrightarrow[	ext{...

Question 2

Q10: Photosynthesis and respiration are essential to maintain balance in nature. Discuss.

Accepted Answer

Photosynthesis and respiration are essential processes that maintain balance in nature through the following ways: 1.  Oxygen and Carbon Dioxide Balance: Photosynthesis uses carbon dioxide from the atmosphere and releases oxygen as a byproduct. Respiration, carried out by plants and animals, uses ox...

Question 3

Q2: Imagine a situation where all the organisms that carry out photosynthesis on the earth have disappeared. What would be the impact of this on living or...

Accepted Answer

If all organisms carrying out photosynthesis disappeared, it would have a devastating impact on all living organisms. Photosynthesis is the process by which plants and some bacteria convert light energy into chemical energy, producing glucose and oxygen. Without photosynthesis: 1.  Oxygen Depletion:...

Question 4

Q3: A potato slice shows the presence of starch with iodine solution. Where does the starch in potatoes come from? Where is the food synthesised in the pl...

Accepted Answer

The starch in potatoes comes from the glucose produced during photosynthesis in the leaves of the potato plant. The food is synthesized in the leaves, which are the primary sites of photosynthesis. The glucose produced is then converted into starch for storage. This starch is transported from the le...

Question 5

Q4: Does the broad and flat structure of leaves make plants more efficient for photosynthesis? Justify your answer.

Accepted Answer

Yes, the broad and flat structure of leaves does make plants more efficient for photosynthesis. This is because: 1.  Increased Surface Area: The flat shape provides a large surface area for capturing sunlight. More sunlight absorption means more energy is available for photosynthesis. 2.  Efficient...

Question 6

Q5: X is broken down using Y to release carbon dioxide, Z , and energy. $$\mathrm{X}+\mathrm{Y} \longrightarrow 	ext { Carbon dioxide }+\mathrm{Z}+	ext...

Accepted Answer

X, Y, and Z stand for the following: X: Glucose ($C_6H_{12}O_6$) Y: Oxygen ($O_2$) Z: Water ($H_2O$) This equation represents the process of respiration.

Question 7

Q6: Krishna set-up an experiment with two potted plants of same size and placed one of them in sunlight and the other in a dark room, as shown in Fig. 10....

Accepted Answer

(i) Krishna might be testing the idea that sunlight is essential for photosynthesis. (ii) The plant in sunlight is likely to be healthier and greener, with more upright leaves. The plant in the dark room may appear pale or yellowish, with droopy leaves, and may exhibit less growth. (iii) The leaves...

Question 8

Q7: Vani believes that 'carbon dioxide is essential for photosynthesis'. She puts an experimental set-up, as shown in Fig. 10.11, to collect evidence to s...

Accepted Answer

(i) Starch will be formed in plant (a), which is in sunlight with carbon dioxide. (ii) Starch will not be formed in plants (b), (c), and (d). Plant (b) lacks carbon dioxide, while plants (c) and (d) lack sunlight. (iii) Oxygen will be generated in plant (a), which is in sunlight with carbon dioxide....

Question 9

Q8: Ananya took four test tubes and filled three-fourth of each test tube with water. She labelled them A, B, C, and D (Fig. 10.12). In test tube A, she k...

Accepted Answer

Ananya wants to find out how plants and animals influence the carbon dioxide levels in water. She will know if she is correct by observing the color changes in the test tubes with the carbon dioxide indicator. The indicator changes color based on the amount of carbon dioxide present:    If the carbo...

Question 10

Q9: Design an experiment to observe if water transportation in plants is quicker in warm or cold conditions.

Accepted Answer

To observe if water transportation in plants is quicker in warm or cold conditions, an experiment can be designed as follows: 1.  Materials: Two similar young plants (e.g., balsam or celery), two beakers, water, red food coloring, a warm environment (e.g., a sunny windowsill or a heat lamp), and a c...

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