Tag: biology

The grasses, used in the making of lawns are called Rolling grass or Lawn grass. Agropyron, Ammophila, Poa are used in making lawns. So they are called Rolling grass.

So, the correct option is ‘All of the above’.

A. True - In Angiosperms, the root tip is covered by a protective layer called Root cap or Calyptra, to provide protection.

Yucca is a monocot and a member of Liliaceae, shows anamolous secondary growth.

So, the correct answer is ‘Yucca’.

Greatest extent of adaptation to various environments is found in angiosperms. Angiosperms grow on most of the places on earth. They grow in hot and cold deserts. They also grow in high altitude of Himalayas.

Rattan belongs to the palm family (Arecales or Palmea) and is found from sea level up to 3,000 m. Around 600 species and 13 genera of rattan are known. Although most rattan species are native to the tropical regions of Africa, Asia, and Australia, there is a large variety in their distribution.  Commercially-used rattan usually grows in hilly tropical areas, with a mean annual temperature of 25° C and an annual rainfall of -2,000 mm. As a result, the main area for rattan production is in the tropical regions of South and Southeast Asia. There are different types of rattan palms, such as high or low climbers, single stemmed or clustered rattan species. Some have very short and underground stems. Several rattan species are known to reach lengths of 100m. Rattan sheaths have spines for protection, along with ‘whips’ that are also covered with spines. These play a major role in supporting the rattan as it grows over trees and other plants in the rainforest. 

Vessels are one of the type of water conducting tissue. These cells are long, cylindrical, dead cells. Vessels are absent in pteridophytes. These cells are present in all angiosperms and some gymnosperms. 

Megagametophyte develops from megaspore. The megaspore enlarges into an oval-shaped structure called the embryo sac, which is termed as megagametophyte.

The egg is the single- celled structure. The egg of an ostrich is the largest cell in the world and it measures up to 15 to 17 cm.

The cell is the structural unit of life and its size ranges from 0.5 micrometers to 100 micrometers. An egg of ostrich is a single-celled structure and is known as the largest cell. The size of each ostrich egg is 170 mm X 130 mm. Thus, the correct answer is option A.

The human egg (ovum) is the largest cell in the body and can be seen without the aid of a microscope. It is one millimeter in diameter. Whereas, a nerve cell is the longest cell in human body.