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Roots developing from plant parts other than radicle are:
Hence, the correct option is B.
NCERT Reference: topic “5.1 THE ROOT” of chapter 5.
Hence, the correct option is A.
NCERT Reference: topic “5.1.2 Modifications of Root” of chapter 5.
Roots associated with nitrogen fixing bacteria are:
Nodulated Roots: The roots having the irregular or the round mass or a lump called nodules within the cells are known as nodulated roots.The roots of leguminous plants possess these characteristic swelling nodules which are caused by colonies of nitrogen fixing bacteria (Rhizobium).
Hence, the correct option is C.
Turnip is a root vegetable. So we eat the root of turnip.
∴ The edible part of turnip is the root. Turnip has modified root
Potato, turmeric, ginger has modified stem to store food.
Hence, the correct option is B.
NCERT Reference: topic “5.1.2 Modifications of Root” of chapter 5.
Which is a modification of root that does not store food?
NCERT Reference: topic “5.1.2 Modifications of Root” of chapter 5.
The stem is the ascending part of the axis bearing branches, leaves, flowers and fruits. It develops from the plumule of the embryo of a germinating seed. It bears nodes and internodes.
Plumule is the future shoot of a plant, as radicle is the future root of the plant.
Hence, the correct option is A.
NCERT Reference: topic “5.2 THE STEM” of chapter 5.
Root hairs in plants have a large surface area and are surrounded by water, soil and nutrients and due to large surface area root hairs absorb water for the growth of plants.
Hence, the correct option is A.
NCERT Reference: topic “5.1.1 Regions of the Root” of chapter 5.
The short lateral stem called the offset in some aquatic plants (such as Eichhornia) bears leaves and tufts of roots at the node and gives rise to new plants.
Rhizome of ginger is a modification of stem because:
Hence, the correct option is B.
NCERT Reference: topic “5.2.1 Modifications of Stem” of chapter 5.
Hence, the correct option is D.
NCERT Reference: topic “5.2.1 Modifications of Stem” of chapter 5.
Hence, the correct option is C.
NCERT Reference: Page no. 70 of topic “5.3 THE LEAF” of chapter 5.
Hence, the correct option is A.
NCERT Reference: Page no. 78 of topic “5.9 DESCRIPTION OF SOME IMPORTANT FAMILIES” of chapter 5.
Pneumatophores are short, vertical and negatively geotropic roots that occur in mangrove plants. Plants having pneumatophores grow in salty marshes. They have lateral roots that grow upward into the air from horizontally secondary roots. These are called as halophytes.
Hence, the correct option is C.
NCERT Reference: Page no. 67 of topic “5.1.2 Modifications of Root” of chapter 5.
Thorns, spines and prickles are modifications in plants that act as defensive organs and prevent them from attack from various insects.
Hence, the correct option is A.
NCERT Reference: Page no. 71 of topic “5.3.4 Modifications of Leaves” and page no. 68 of topic “5.2.1 Modifications of Stem”of chapter 5.
A monocot can be distinguished from a dicot by:
Venation refers to the pattern of arrangement of veins in the leaflet. The monocots have their leaf veins arranged in a parallel manner with respect to each other whereas in case of dicots the leaf veins are reticulated or muzzled up.
Hence, the correct option is B.
NCERT Reference: Page no. 70 of topic “5.3.1 Venation” of chapter 5.
The placenta is attached to the developing seed near the ______.
The placenta is attached to the developing seed near the hilum. It is the scar located near the edge where seed breaks from stalf of funicules i.e., connecting the seed with fruit wall and placenta.
Grass is the correct option because veins on the lamina run parallel to one another is called parallel venation. It is characteristically found in monocot plants and grass is a characteristic of monocot plant.
Hence, the correct option is B.
NCERT Reference: Page no. 70 of topic “5.3.1 Venation” of chapter 5.
Leaves are changed into spines in Xerophytic structure called:
Hence, the correct option is C.
NCERT Reference: Page no. 68 of topic “5.2.1 Modifications of Stem” of chapter 5
Reticulate venation is a characteristic of dicots and parallel venation is of monocots. But few exceptions are also seen in this generalization: parallel venation is also found in dicot plants.
Example: Calophyllum, corymbium , etc., and reticulate venation is also found in monocot plants such Alocasia, Smilax, etc.
Hence, the correct option is B.
Verticillaster is a special type of inflorescence seen in Leucas. At each node of the stem two axillary opposite cymose inflorescences develop on either side. The cyme in the axil of each leaf starts as a dichasial cyme but subsequently becomes a monochasial scorpioid cyme. As a result, the cyme bends round the stem on either side and meets a similar cyme from the opposite side. Hence, at each node there is a cluster of flowers completely surrounding the stem. It is a characteristic of family Labiatae.
► Cucurbitaceae family shows axillary solitary inflorescence.
► Thyrse inflorescence is a characteristic of the Rubiaceae family.
► Capitulum inflorescence is a characteristic of family Asteraceae.
Hence, the correct option is D.
In cyathium the ratio between male to female flower is:
Cyathium inflorescence consists of a single central female flower surrounded by many groups of male flowers. In each group the male flowers are borne in scorpiod manner and the inflorescence is surrounded by an involucre.
Example: Euphorbia.
Hence, the correct option is B.
Capitulum (Head): It is a modified raceme in which the main axis is flattened, called receptacle.
A biparous cyme ending in a uniparous cyme constitutes ______.
Hence, the correct option is A.
Flowers are sessile in spike. A spike is an unbranched, indeterminate inflorescence, similar to a raceme but bearing sessile flowers (sessile flowers are attached directly, without stalks). Examples occur on Malabar nut (Justicia adhatoda) and chaff flowers.
Hence, the correct option is B.
The flowers in the raceme/racemose are arranged ______.
It is acropetally arranged because since the plant continues to grow it's clockwise arrangements gives the maximum absorption of light for photosynthesis and help the plant to form buds for its upgrowth.
Hence, the correct option is A.
NCERT Reference: topic “5.4 THE INFLORESCENCE” of chapter 5.
Capitulum (Head): It is a characteristic of compositae (Asteraceae). Peduncle is flattened to form a receptacle that bears centripetally arranged small sessile flowers called florets surrounded by involucre of bracts.
Example: Marigold, Sunflower.
Hence, the correct option is B.
Three types of flowers occur in the Inflorescence of:
Hence, the correct option is B.
Hence, the correct option is B.
Pedicellate flowers arising from a single point form ______.
Hence, the correct option is A.
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288 videos|470 docs|347 tests
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