Identify A, B, C, D and E respectively-

Diagram given below shows stages in embryogenesis in atypical dicot (Capsella). Identify structures A to D respectively-

Identify A, B, C, D and E structures shown in figure of a female gametophyte respectively-

The above diagram refers to a T.S. of anther. Identify A to E respectively-

Identify A to D respectively-

Which of the following statements is not true about somatic embryogenesis?

Asomatic embryo develops from a somatic cell
The pattern of development of a somatic embryo is com-parable to that of a zygotic embryo
Somatic embryos can develop from microspores
Somatic embryo is induced usually by an auxin such as 2, 4-D

Solution

Somatic embryogenesis is a process where a plant or embryo is derived from a single somatic cell or group of somatic cells. Somatic embryos are formed from plant cells that are not normally involved in the development of embryos, i.e.,ordinary plant tissue. No endosperm or seed coat is formed around a somatic embryo.

Albuminous seeds store their reserve food mainly in

Solution

Endosperm is the nutritive tissue which provides nourishment to the embryo in seed plant. Albuminous seeds retain a part of endosperm as it is not completely used up during embryo development (e.g., wheat, maize, barley,castor, sunflower).

Which of the following statements is correct?

Sporopollenin can withstand high temperatures but not strong acids
Sporopollenin can be degraded by enzymes
Sporopollenin is made up of inorganic materials
Sporopollenin can withstand high temperatures as well as strong acids and alkalis

Solution

Pollen grains are generally spherical and a prominent two-layered wall. The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic material known. It can withstand high temperatures and strong acids and alkali.

Animal vectors are required for pollination in

Megaspores are produced from the megaspore mother cells after

Solution

Single Megaspore Mother Cell (MMC) with dense cytoplasm and a prominent nucleus gets differentiated from nucellus near the micropylar region. This Megaspore Mother Cell (MMC) undergoes meiosis to form ‘4’ haploid cells called megaspores and the process of formation is known as megasporogenesis.

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