Please select a subject first
Name the parts of an angiosperm flower in which development of male and female gametophyte take place
Concept: Flower - a Fascinating Organ of Angiosperms
What are the various public health measures, which you would suggest as safeguard against infectious diseases?
Concept: Introduction of Human Health and Diseases
In which way has the study of biology helped us to control infectious diseases?
Concept: Introduction of Human Health and Diseases
How does the transmission of each of the following diseases take place?
(a) Amoebiasis
(b) Malaria
(c) Ascariasis
(d) Pneumonia
Concept: Introduction of Human Health and Diseases
The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:
(a) MALT
(b) CMI
(c) AIDS
(d) NACO
(e) HIV
Concept: Introduction of Human Health and Diseases
List the three states the annuals and biennial angiosperms have to pass through during their life cycle.
Concept: Flower - a Fascinating Organ of Angiosperms
By taking two examples explain how has bio-fortification helped in improving food quality.
Concept: Introduction of Strategies for Enhancement in Food Production
In a flowering plant a microspore mother cell produces four male gametophytes while a megapore mother cell forms only one female gametophyte. Explain
Concept: Flower - a Fascinating Organ of Angiosperms
Read the statement and answer the questions that follow.
A flower of brinjal has 520 ovules in its ovary. However, it produces a fruit with only 480 viable seeds.
(a) What could have prevented the rest of the 40 ovules from maturing into viable seeds? Explain giving a reason.
(b) Describe the development of a dicot embryo in a viable seed.
(c) Why certain angiospermic seed albuminous while others are exalbuminous? Explain.
Concept: Flower - a Fascinating Organ of Angiosperms
A capsicum flower has 240 ovules in its ovary. But, it produces a fruit with only 180 viable seeds.
Concept: Flower - a Fascinating Organ of Angiosperms
Name the following: Any one inter-specific hybrid mammal.
Concept: Introduction of Strategies for Enhancement in Food Production
Give an example of an angiosperm seed that has a perisperm. Name the part the perisperm develops from.
Concept: Flower - a Fascinating Organ of Angiosperms
Explain the events upto double fertilisation after the pollen tube enters one of the synergids in an ovule of an angiosperm.
Concept: Flower - a Fascinating Organ of Angiosperms
Bottled fruit juices are clearer as compared to those made at home. Explain.
Concept: Introduction of Strategies for Enhancement in Food Production
A typical flower has ______ different kinds of whorl.
Concept: Flower - a Fascinating Organ of Angiosperms
Science of cultivation, breeding, marketing and arrangement of flowers is called ______.
Concept: Flower - a Fascinating Organ of Angiosperms
Fragrant flowers with well developed nectaries are an adaptation for ______.
Concept: Flower - a Fascinating Organ of Angiosperms
The flower is the site of ______.
Concept: Flower - a Fascinating Organ of Angiosperms
Pollen grains are well preserved as fossils because of the presence of ______
Concept: Flower - a Fascinating Organ of Angiosperms
In a fertilized ovule, n, 2n, and 3n conditions occur respectively in ______
Concept: Flower - a Fascinating Organ of Angiosperms
