Question 1

If a primary root continues to grow, the type of root system will be known as:

Accepted Answer

Correct answer is C

Question 2

Pneumatophores occur in plants of:

Accepted Answer

In plants growing in salty marshes some branches of tap root grow vertically upwards into the air from horizontally secondary roots. These roots are called pneumatophores.

Question 3

Roots developing from plant parts other than radical are:

Accepted Answer

In monocotyledonous plants the radicle dies immediately after germination of seeds and later these roots arise from any other portion (stem, leaves etc.) of the plant.

Question 4

In which the pneumatophores are found:

Accepted Answer

Pneumatophores develop from horizontal roots. They bear a number of lenticels or pneumathodes. Exchange of gases occurs through these pores, e.g., Rhizophora.

Question 5

Outer covering of epiphytic root is:

Accepted Answer

In epiphytic roots the outer covering is made up of spongy tissue, the velamen which absorbs moisture from air.

Question 6

Which of the following is correctly matched?

Accepted Answer

In epiphytic roots the outer covering is made up of spongy tissue, the velamen which absorbs moisture from air.

Question 7

Conical fleshy roots occur in:

Accepted Answer

The swollen root is broad at the base and tapers gradually towards the apex.

Question 8

Napiform roots are recorded from:

Accepted Answer

The root is nearly globular or spherical in shape. The basal portion of root is much swollen which suddenly tapers towards the apex giving a top shaped appearance, e.g., Turnip and Beet.

Question 9

Fusiform roots are found in:

Accepted Answer

The storage root is like a spindle, narrow towards both base and apex. It occurs in Raphanus satious. The basal part of it is made of tap root.

Question 10

A fibrous root system is better adapted than tap root system for:

Accepted Answer

They are thin thread - like adventitious roots which often develop in groups. Fibrous roots provide better and firm anchorage to the plant, e.g., Grass.

Question 11

Stilt roots are reported from:

Accepted Answer

In some plants roots arise from lower nodes of stem and enter the soil to provide extra support. They behave as ropes of a tent. Such roots are called stilt or brace roots e.g. Pandanus.

Question 12

Assimilatory (photosynthetic) roots are a characteristic of:

Accepted Answer

These roots develop chlorophyll and become photosynthetic. They synthesize carbohydrates from carbon dioxide and water in presence of light, e.g., Trapa, Tinospora, Taeniophyllum and podostemon.

Question 13

Root cap is largest in:

Accepted Answer

Correct answer is B

Question 14

In Amorphophallus and Colocasia (Ariods) an extremely enlarged underground vertical stem meant for vegetative reproduction and storage is:

Accepted Answer

Corm is an underground modification of main stem and stores food materials and becomes tuberous. Buds present extemally corms give rise to new aerial shoots and new corms.

Question 15

Vegetative reproduction occurs by bulbil in:

Accepted Answer

Bulbils are fleshy vegetative buds which store food and take part in vegetative propagation. Bulbils of Agave germinate which still on inflorescence and thus show vivipary.

Question 16

Stem is modified into cladode in:

Accepted Answer

Cladode are somewhat similar to phylloclade with the difference that cladode may by made up of only one internode, e.g., Asparagus (Satavar) or two internodes e.g., Ruscus.

Question 17

Find out correct order of vegetative propagules of plants like potato, ginger Agave, Bryophyllum and water hyacinth.

Accepted Answer

Correct answer is C

Question 18

Accessory buds occur at:

Accepted Answer

Accessory buds borne at the leaf bases. They are two types : (i) Collateral buds present on the side of axillary bud, e.g., lilies (ii) Superposed buds present above the axillary bud e.g., Aristolochia.

Question 19

Floral bud tendril is found in:

Accepted Answer

Correct answer is A

Question 20

Thorn is a stem structure because it.

Accepted Answer

Thorns are actually modified axillary buds or terminal buds and they possess vascular supply.

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Solution for Class 11, Biology, Morphology of Flowering Plants

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