Sexual Reproduction in Flowering Plants Test - 75

Monocots seed- one cotyledons.

Seeds, which store food materials in their endosperm are called endospermic or albuminous seeds. (e.g., Castor, maize, wheat, barley, grasses, rice, onion).

Seeds, which store food materials in their cotyledons are called non- endospermic or exalbuminous seeds.(e.g., gram, pea, bean, almond, groundnut, mustard, sunflower).

So, the correct answer is 'a, b and c'.

Seeds, which store food materials in their cotyledons are called non- endospermic or exalbuminous seeds.(e.g., Gram, Pea, Bean, Almond, Groundnut).

Seeds, which store food materials in their endosperm are called endospermic or albuminous seeds. (e.g., Castor, Maize, Wheat, Barley, Grasses).

Monocot seed- one cotyledon.

Dicot seed- Two cotyledons.

A. Maize- Monocot albuminous seed.

B. Wheat- Monocot albuminous seed.

C. Rice- Monocot albuminous seed.

So, the correct answer is 'All of the above'.

• In most of the angiosperms, the endosperm by nature will be triploid. 
• In some plants, the endosperm is completely consumed by the formation of zygote. 
• In pea and groundnut, the endosperm is consumed by developing an embryo in the seed. 
• The endosperm is completely absorbed by this growing embryo and hence food reserve gets stored in the cotyledons.
• The correct option is B.

 A. Cuscuta- Dodder is parasitic on a very wide variety of plants, including a number of agricultural and horticultural crop species, such as alfalfa, lespedeza. It has no cotyledons.

B. Santalum is a genus of woody flowering plants, the best known and commercially valuable of which is the Indian sandalwood tree. It has two cotyledons.

C. Lodoicea, commonly known as the sea coconut, it has one cotyledons.

So, the correct answer is 'Cuscuta'.

Seeds, which store food materials in their cotyledons are called non- endospermic or exalbuminous seeds.(e.g., Gram, Pea, Bean, Almond, Groundnut).

Seeds, which store food materials in their endosperm are called endospermic or albuminous seeds. (e.g., Castor, Maize, Wheat, Barley, Grasses).

So, the correct answer is 'Endospermic albuminous'.

The oxidation number of nitrogen in the compound nitrate is +5 and in the compound ammonia is -3. So, in the conversion of the nitrate to ammonia the oxidation number of nitrogen is changing from +5  to -3 which indicates that there is a gain of electrons which is called reduction. So, the given process is the reductive process.

Nitrate assimilation is the process in which the absorbed nitrate is reduced by the enzyme nitrate. It is possible with the help of reduced coenzymes into nitrite. Nitrite is then reduced by enzyme nitrite reductase with the help of reduced coenzymes and ferredoxin further into ammonia. Ferredoxin supplies electrons one by one for this reduction. Therefore Ferredoxin is the correct answer.

The correct option is A.

A. The nucellus is generally used up during the development of embryo, but in some cases, it remains outside the endosperm in the form of a thin layer, called perisperm.

B. Integuments- These are outer covering of ovule which provide protection to the developing embryo.

C. Pericarp or fruit developed from wall of the ovary.

Anemophily is a type of pollination in which pollination takes place with the help of wind. Entomophily is a type of pollination in which pollination takes place through insect. Myrmecophily is a mutual association of some plants with ants to save themselves from other animals. Hydrophily is a type of pollination in which pollination occurs through flow of water.