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CBSE · Class 7 · Science

Life Processes in Plants

Standard difficulty · 20 questions · 40 marks

Name: Date: Score: ____ / 40

Show your working for Sections B and C. Answers are on the last page — try every question first!

Section A — Choose the correct answer8 × 1 = 8 marks
1.
The process by which green plants make food is:
  1. digestion
  2. transpiration
  3. respiration
  4. photosynthesis
2.
In which case will STARCH form in the leaf?
  1. half a leaf inside a bottle with caustic soda, in sunlight
  2. the part of a leaf covered with black paper in sunlight
  3. the green part of a variegated leaf in sunlight
  4. the white part of a variegated leaf in sunlight
3.
In which case will NO starch form?
  1. the green part of a variegated leaf in sunlight
  2. a green leaf of a plant kept in sunlight
  3. a leaf of a plant kept in the dark for two days
  4. a red-coloured leaf of a plant in sunlight
4.
Which process releases energy?
  1. respiration
  2. germination
  3. photosynthesis
  4. transpiration
5.
Which tissue carries sugar to a growing fruit?
  1. chlorophyll
  2. petals
  3. phloem
  4. xylem
6.
A water plant in sunlight gives out 14 bubbles of oxygen every minute. How many bubbles in 10 minutes?
  1. 140 bubbles
  2. 126 bubbles
  3. 154 bubbles
  4. 24 bubbles
7.
Red ink rose 2 mm every minute up a twig. How far did it rise in 16 minutes?
  1. 32 mm
  2. 30 mm
  3. 18 mm
  4. 34 mm
8.
A plant in sunlight with water was 4 cm tall and grew about 4 cm a week. How tall was it after two weeks?
  1. 18 cm
  2. 8 cm
  3. 12 cm
  4. 13 cm
Section B — Short answer8 × 2 = 16 marks
9.
Write the word equation for photosynthesis.
10.
Will starch form? Write "yes" or "no": (a) a red-coloured leaf of a plant in sunlight (b) the white part of a variegated leaf in sunlight
11.
Is it "photosynthesis" or "respiration" that (a) uses glucose and oxygen (b) uses carbon dioxide?
12.
Is it the "xylem" or the "phloem" that carries (a) sugar to a growing fruit (b) food from the leaves to the roots?
13.
Fill in the missing word: (a) carbon dioxide + water → glucose + ____ (b) glucose + ____ → carbon dioxide + water + energy
14.
Germinating moong seeds were kept in 2 flasks of 53 seeds each. How many seeds were used? What gas did they give out?
15.
A water plant gave 28 bubbles a minute in bright sunlight, 8 in dim light and 0 in the dark. What does this show? How many bubbles in all in 5 minutes of bright sunlight?
16.
What is the role of (a) the stomata (b) the potato in a plant's life?
Section C — Word problems4 × 4 = 16 marks
17.
Describe an experiment to show that sunlight is needed for photosynthesis.
18.
Leaves from three set-ups are tested with iodine: (1) a leaf of a plant kept in the dark for two days; (2) half a leaf inside a bottle with caustic soda, in sunlight; (3) the part of a leaf covered with black paper in sunlight. Which turn blue-black? What do the results show about photosynthesis?
19.
Make a table comparing photosynthesis and respiration using these points: goes on day and night; happens in all living cells; makes glucose; gives out oxygen.
20.
A water plant under a funnel in sunlight gave 11 bubbles a minute. (a) How many bubbles in 3 minutes? (b) How could you show the gas is oxygen? (c) What would happen in the dark, and why?
AmbifulWorksheets
Practice that never repeats
CBSE · Class 7 · Science

Answer key

Life Processes in Plants · AW-7S-LPP-2026-V1 · For parents — fold back or tear off before handing the sheet to your child.

QAnswerWorking
1(d) photosynthesis—
2(c) the green part of a variegated leaf in sunlight—
3(c) a leaf of a plant kept in the dark for two days—
4(a) respiration—
5(c) phloem—
6(a) 140 bubbles14 × 10 = 140
7(a) 32 mm2 × 16 = 32
8(c) 12 cm4 + 2 × 4
9Carbon dioxide + water → glucose + oxygen (in sunlight, with chlorophyll).—
10(a) yes (b) no—
11(a) respiration (b) photosynthesis—
12(a) phloem (b) phloem—
13(a) oxygen (b) oxygen—
14106 seeds; carbon dioxide53 × 2
15More light, more oxygen (photosynthesis needs light); 140 bubbles28 × 5
16(a) pores for gases to pass in and out (b) food made in leaves, carried by phloem and stored—
17Keep a potted plant in the dark for 2–3 days to remove starch. Cover part of a leaf with black paper and put the plant in sunlight for a few hours. Test the leaf for starch: only the uncovered part turns blue-black, showing sunlight is needed.—
18(1) no blue-black; (2) no blue-black; (3) no blue-black. Photosynthesis needs sunlight, chlorophyll and carbon dioxide.—
19goes on day and night: respiration; happens in all living cells: respiration; makes glucose: photosynthesis; gives out oxygen: photosynthesis.—
20(a) 33 bubbles (b) A glowing or lit matchstick burns brighter in it. (c) No bubbles: there is no photosynthesis without light.11 × 3