Question

n. olympiad practice questions
darken the bubble next to each correct option.
1 in the picture given below, the seeds are dispersed by wind. why? can you write
the name of the plant in the blank provided?

a. the seeds are actually heavy, but due to strong wind it is falling off on
the ground.
b. the seeds are lightweight and hairy, hence they get easily dispersed by
wind.
c heavy wind can disperse any seed.
d. seeds dispersed by wind grow quickly, so most of the plant seeds are
dispersed by wind.
2 fill in the blanks in the passage given below.
at first, _____________ comes out from the seed and grows into the soil. it fixes
the _________ in the soil from where it starts obtaining __ and ____.
a. water, soil, growing plant, nutrients, radicle
b. growing plant, nutrients, water, radicle
c radicle, growing plant, nutrients, water
d. nutrients, soil, water, growing plant

Explanation:

• Question 1: Dandelion seeds are lightweight and have hair - like structures (pappus). Lightweight and hairy seeds are easily carried by the wind. Option a is incorrect because heavy seeds are not easily dispersed by wind. Option c is wrong as not any seed can be dispersed by heavy wind (e.g., large, heavy seeds like coconut). Option d is incorrect as the growth rate of the seed has no relation to its dispersal mechanism.
• Question 2: The radicle is the first part to emerge from the seed. It fixes the growing plant in the soil. Once fixed, the plant starts obtaining nutrients and water from the soil.

Answer:

1. B. The seeds are lightweight and hairy, hence they get easily dispersed by wind.
2. C. radicle, growing plant, nutrients, water