This is correct. Both these adaptations have been made by floating plants, such as water lily. Floating plants like water lily have poorly developed roots and root hair as water is not a problem to them. Floating plants have a thin and flexible stem so that they can sway and bend with the water movements and pressure.

 Antelopes are terrestrial. They live mainly on land.

Plants growing in regions with low rainfall are called xerophytes. They have a long and extensive root system. Cactus is a xerophyte.

All these are correct statements. Growth in living things is external and is thus, reversible. Growth in living beings is internal and takes place by the addition of new body material called protoplasm. Respiration occurs in living beings day and night.

Animals that live on trees and use the sky for their activities, such as the birds are called arboreal or aerial animals. Bat is an arboreal animal.

Squid is an aquatic animal. It stays in water and has adaptations that support its life in the aquatic habitat.

 This is the correct statement. They have sharp curved claws because these help them maintain a good grip when they climb.

This is the correct option. They stay in deep burrows during the day in the sand and come out only at night when the temperatures are cooler.

This is correct. Mesophytes are terrestrial plants, which are adapted to neither a particularly dry nor particularly wet environment. Grass is a mesophyte.

These statements are correct. Some sea animals like whales and dolphins do not have gills. They breathe in air through their nostrils or blowholes and they can stay underwater for a long time without breathing. For breathing they come out of the water from time to time. Special breathing organs like gills in fishes are present to help them survive under water.

This is correct because abiotic factors are chemical and physical factors like climate and soil. Thus, both sunlight and sand dunes that are the soil type in a desert system are abiotic.

Both these are unicellular organisms.

This is the correct answer. Sponges and corals do not show movement.

This is incorrect. Adult frogs breathe through their lungs and exchange gases through their skin, and the lining of their mouths. This option is correct because all the statements are incorrect. Cactus have spines on stems as modified leaves. The fleshy stems of cactus are for storing water. Sweating does occur in a camel, although it is very less and in very hot conditions. Adult frogs breathe through their lungs and exchange gases through their skin, and the lining of their mouths.