CBSE Questions for Class 12 Medical Biology Sexual Reproduction In Flowering Plants Quiz 8 - MCQExams.com

The attachement of filament to the anthers determines the classification of stamens. When the filament is attached along the entire/whole length of the anther, it is called adnate. It is seen in Nicotiana, Magnolia.

B. In dorsifixed condition, filaments are attached to the dorsal side of the anthers.

C. In basifixed condition, filaments are attached to the base of the anthers.

D. In versatile condition, filaments are attached to a point on the connective so that anthers can swing freely.

Hence, the correct answer is 'Adnate'.

Under favourable conditions, the  seed absorbs water from the surroundings and swells up, the seed coat ruptures and the embryo emerges out. The radical grows downwards into the soil and forms root. So, the correct answer is ‘Radicle’.

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

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

Vallisneria is a genus of freshwater aquatic plant, commonly called eelgrass, tape grass or vallis.  It has a non albuminous seed.

So, the correct answer is 'Vallisneria'.

• In monocotyledonous endospermic seed, the endosperm is surrounded by a special one-cell thick layer, called the aleurone layer. Its main function is to nourish the embryo enclosed in the seed. 
• It is protein-rich coat formed by the outermost layer of endospermic cells. It actively secretes a few enzymes which help in the process of seed germination.

The germ of a cereal is the reproductive part that germinates to grow into a plant, it is the embryo of the seed. Cereal grains and their components, such as wheat germ oil, rice bran oil, and maize, may be used as a source from which vegetable oil is extracted, or used directly as a food ingredient. So, the correct answer is 'Embryo'.

Endospermic seeds are those that have an endosperm in the mature seed. It is fleshy, oily, surrounds the embryo, and functions as the sole food storage organ. Inside the seed coat, a thin and papery cotyledon is present. Monocot plants have endospermic seeds. So, the correct answer is ‘Papery’.

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).

(a) Maize- endospermic

(b) Mustard- Non- endospermic

(c) Pea- Non endospermic.

So, the correct answer is'a-d, b-e, c-e'.

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.

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.

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 'All of the above'.

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 pollen grains which are very light in weight can be passed on by wind from one flower to another or to the stigma of the same flower. This is known as wind pollination. 
• They produce lightweight pollens in large numbers and do not produce vectors. The stigma is sticky.

The Yucca moth is also termed as the Pronuba moth. It is a small white moth that lives in the semi-arid habitats where Yucca plants grow. The Yucca moth is well-known for its relationship with the Yucca plant. The Yucca moth’s larvae are relying on the seeds of the Yucca plant as a primary food source. No one can exist without the other, creating an obligate mutualism between the moth and the plant. It is true for types of Yucca moths such as Tegeticula .

 So correct answer is option B.

• The pollen wall actually is the multi-layered structure that includes an inner intine, which is composed mainly of polysaccharides, and an outer exine, which consists mainly of sporopollenin. 
• The exine is further divided into two layers, the outer ektexine (sexine and foot layer) and the inner endexine.

So, the correct answer is C.

Correct Option: B

Explanation:

• Apomixis is the formation of new individuals of seeds with embryo growing directly from diploid cells of nucellus or integument (as in Mango and Orange), diploid egg or some other gametophytic cell (as in Apple, Rubus, etc.).

Pollination is processed by the agent which transfers pollen from the pollen sac or anther to the stigma or ovule in the flower. Pollination done by snails is called malacophily. Such type of flowers is called as malacophilous. These flowers achieve pollination only by the help of snails and slugs.

Thus, the correct answer is malacophily.

Correct option is B.

Yucca is the pollinated by a moth known as the Tegeticulla yuccasella.  Each spring, adult moths emerge from the underground cocoons. And the males and females meet up with each other on Yucca plants for mating.

The Yucca moth is also termed as the pronuba moth. It is a small white moth that lives in the semi-arid habitats where Yucca plants grow.

Thus the correct answer is A.