CLASS 6 · SCIENCE · CHAPTER 2
Simple and explained answers for all 10 “Let us enhance our learning” questions on biodiversity, grouping, habitats, and adaptations.
10 worked answers · short steps first, explanations when you need them
Textbook pages 31–34
Question 1
Wheat is a monocot (fibrous roots, parallel veins); kidney bean is a dicot (taproot, net-like veins).
Wheat: fibrous roots and parallel leaf venation. Kidney bean: taproot and reticulate leaf venation.
Question 2
Aquatic: dolphin, whale. Land: horse, sheep, squirrel, earthworm, pigeon, tortoise. Both: frog, crocodile.
Aquatic: dolphin, whale. Terrestrial: horse, sheep, squirrel, earthworm, pigeon, tortoise. Both land and water: frog, crocodile.
Question 3
Taproot; reticulate leaf venation.
Radish has a taproot. Its leaves generally show reticulate venation.
Question 4
Mountain goats have stronger climbing features and a warmer coat; plains goats suit flat ground. These are habitat adaptations.
Both are goats, but mountain goats are better suited to steep, rocky and colder places, while plains goats suit flatter areas. Their different body features help them survive in their respective habitats.
Question 5
Use backbone as the feature: seven listed animals are vertebrates; cockroach and grasshopper are invertebrates.
Vertebrates (with backbone): cow, pigeon, bat, tortoise, whale, fish, lizard. Invertebrates (without backbone): cockroach, grasshopper.
Question 6
It causes habitat and biodiversity loss. Protect forests, plant native species, use resources wisely, and avoid damaging important habitats.
Deforestation destroys habitats and food sources, reduces biodiversity, can increase soil erosion, and can disturb local water and climate patterns. We can protect forests, plant native trees, use resources carefully, and choose development plans that avoid key habitats.
Question 7
A: a dicot such as hibiscus. B: a monocot such as grass.
Group A (reticulate venation): for example, hibiscus or kidney bean. Group B (parallel venation): for example, grass or wheat.
Question 8
Check its height, woody stems, and whether several branches begin near the ground.
Sanjay could ask: “Does the hibiscus have several hard, woody stems? Do they branch near the ground? Is it shorter than a tree?” These features support grouping it as a shrub.
Question 9
A: kidney bean/chickpea. B: wheat/maize.
Group A (dicot, taproot): kidney bean, chickpea, mustard, or radish. Group B (monocot, fibrous roots): wheat, maize, rice, or grass.
Question 10
Webbed toes help a duck push water and swim; a pigeon’s toes are not webbed.
A duck’s toes are joined by a web, unlike a pigeon’s separate toes. The web acts like a paddle and helps the duck swim.