Plants Adaptation and Reproduction (Class 4)

What this worksheet covers

This is a fifteen-question practice worksheet on plants — adaptation and reproduction for Class 4, written to the pattern of the SOF National Science Olympiad (NSO). It carries 21 marks and is designed to be attempted in 40 minutes, split across three sections — Scientific Reasoning, Applying What You Know and Achievers Section. Every question is multiple choice with exactly one correct option, and every one comes with a fully worked solution rather than just an answer key — so a child who gets one wrong can see where the reasoning went astray instead of only learning that it did.

Skills your child practises

• Applied problem-solving on plants — adaptation and reproduction at Class 4 level
• Working accurately against a time limit, as the real paper demands
• Scientific Reasoning questions in the olympiad format
• Applying What You Know questions in the olympiad format
• Achievers Section questions in the olympiad format
• Reading worked solutions to find the step that went wrong

How to use it

1. 1There are 15 questions in this worksheet. All questions are compulsory.
2. 2Each question has four options (A), (B), (C) and (D). Exactly one option is correct.
3. 3Questions 1–12 carry 1 mark each. Questions 13–15 (Achievers Section) carry 3 marks each.
4. 4There is no negative marking. Study every diagram and table carefully.

Sample questions from this worksheet

A preview of what's inside Plants Adaptation and Reproduction (Class 4) — the PDF has the full set, and every question comes with a worked solution like these.

1. 1. Which part of a flower produces pollen grains?

   • AAnthercorrect
   • BStigma
   • COvary
   • DSepal
   Solution: The anther is the swollen top of the stamen, the male part of a flower, and it is where pollen grains are made.

2. 2. Bright petals and sweet nectar are most useful to a flower because they _______.

   • AHelp the flower make its own food
   • BHelp the flower absorb more sunlight
   • CKeep all insects away
   • DAttract insects that carry pollen from flower to flowercorrect
   Solution: Bright petals and nectar attract insects that carry pollen from flower to flower. As an insect feeds, pollen sticks to its body and is carried to the next flower. Wind-pollinated flowers such as grasses are small, dull and have no nectar.

3. 3. Consider the following statements.(i) All flowers have both male and female parts.(ii) Photosynthesis stops at night because there is no sunlight.(iii) Desert plants usually have long roots that reach deep for water.Which of the statements is/are correct?

   • A(i) and (ii) only
   • B(ii) and (iii) onlycorrect
   • C(i) and (iii) only
   • DAll three
   Solution: Statement (i) is false — in plants such as papaya and maize, the male and female flowers are separate. Statement (ii) is true; photosynthesis needs sunlight, though respiration carries on day and night. Statement (iii) is true; long roots reach the water deep underground. Hence (ii) and (iii).