Tag: biology

Questions Related to biology

Petiole is used in multiplication of

natural vegetative propagation reproduction in plants biology

  1. Bignonia

  2. Saintpaulia

  3. Sansevieria

  4. Pepromia

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Correct Option: D
Explanation:

Peperomia is a small perennial epiphyte growing on rotten wood. These plants are  naturally propagated by seeds but these are commercially propagated by leaf or stem cuttings. The petiole is an important part of leaf which is used for the propagation. Leaves are harvested from stock plants for which propagation is desired. The petiole section of each leaf is sterilized and cultured on a nutrient media which forms callus and finally develops into a plantlet.

So, the correct answer is option D.

Which of the following is a part of vegetative propagation?

natural vegetative propagation reproduction in plants biology

  1. Root

  2. Stem

  3. Leaf

  4. All of the above

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Correct Option: D
Explanation:

Vegetative propagation is a generation of the new plant with help of vegetative parts of the plant without producing seed. It occurs with stem, root, bulb and leaves. The meristematic cells of the vegetative part undergo rapid division to form a new organism.

So, the correct answer is option D.

Which one propagates through an offset?

natural vegetative propagation reproduction in plants biology

  1. Cynodon dactylon

  2. Eichhornia

  3. Fragaria

  4. Mentha

Show answer
Correct Option: B
Explanation:
A. Cynodon dactylon, also known as Indian doob, is a perennial grass which propagates by means of rhizomes and stolons.
B. Eichhornia, commonly known as water hyacinth, is an invasive aquatic species which propagates by means offset. Offset are the modified stems which on detachment from the parent plant develop into a new plant.
C. Fragaria, commonly known as strawberry, is a herbaceous plant that propagates by means of stolons and runners.
D. Mentha, commonly known as peppermint, is a herbaceous plant that propagates by means of stolons.
So, the correct answer is 'Eichhornia'.

A slender lateral branch arises from the base of the main axis and after growing aerially for some time arch downwards to touch the ground. Such type of modification is

natural vegetative propagation reproduction in plants biology

  1. Runner

  2. Sucker

  3. Stolon

  4. Offset

Show answer
Correct Option: C
Explanation:

A- Underground stems of some plants spread to new niches and when older parts die new plants are formed. e.g., grass and strawberry.

B- In these plants, a slender lateral branch arises from the base of the main axis and after growing aerially for some time arch downwards to touch the ground. e.g., mint and jasmine.
C- A lateral branch with short inter-nodes and each node bearing a rosette of leaves and a tuft of roots are found in aquatic plants. e.g., Pistia and Eichhornia.
D- In these, the lateral branches originate from the basal and underground portion of the main stem, grow horizontally beneath the soil and then come out obliquely upward giving rise to leafy shoots. e.g., banana, pineapple, and Chrysanthemum.
So, the correct option is 'Stolon'.

A ________ usually grows along the surface of the ground.

natural vegetative propagation reproduction in plants biology

  1. Runner

  2. Tendril

  3. A & B

  4. None of the above

Show answer
Correct Option: A
Explanation:
Creeping stems are usually referred to as runners. They are found running horizontally on the soil surface. Their nodes usually bear axillary buds, adventitious roots, and scale leaves. They arise from axillary buds and run in almost all directions. They also play a role in vegetative propagation. For example, Cynodon (Lawn grass), Oxalis (Wood sorrel), etc.
So, the correct answer is 'Runner'.

Each leaf scar in a tuber has a bub called _______.

natural vegetative propagation reproduction in plants biology

  1. Eye

  2. Scale

  3. Both A & B

  4. None of these

Show answer
Correct Option: A
Explanation:
(A) Eye.
The tuber consists of parts of a normal stem, including nodes and internodes. The nodes are the eyes and each has a leaf scar. The nodes or eyes are arranged around the tuber in a spiral fashion beginning on the end opposite the attachment point to the stolon.

A short aquatic runner may be called as?

natural vegetative propagation reproduction in plants biology

  1. Trailers

  2. Stolon

  3. Offset

  4. Sucker

Show answer
Correct Option: B

Which of the following is incorrect?


I. Bryophyllum and Kalanchoe can be vegetatively propagated by leaf segments.
II. Mango and Guava are propagated through grafting.
III. Individual of clone have same height.
IV. Roots are used in the vegetative propagation of sweet potato.
V. Oestrus cycle is found in mammalian females other than primates.

natural vegetative propagation reproduction in plants biology

  1. I and II

  2. Only III

  3. II and IV

  4. IV and V

Show answer
Correct Option: A
Explanation:

Answer is option A i.e. "I and II"
Bryophyllum and Kalanchoe can reproduce by the formation of buds on leaves, i.e. they can propagate vegetatively. Mango and guava asexually reproduce or propagated through grafting. Grafting is the basic propagation option for mango and guava.
Whereas, clones have same genetic make-up but not phenotypic (e.g. their height may differ).
Vegetative propagation of sweet potato occurs through adventitious buds.
Oestrus cycle is the period in the sexual cycle of female mammals, except the higher primates.

Onions and gladioli grow from

natural vegetative propagation reproduction in plants biology

  1. Bulbs

  2. Roots

  3. Buds on the leaf margin

  4. Spore formation

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Correct Option: A

Seeds are not a product of reproduction in

natural vegetative propagation reproduction in plants biology

  1. Lemons

  2. Potatoes

  3. Tomatoes

  4. Jowar

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Correct Option: B
Explanation:
  • The potato is a starchy, tuberous crop which is native to America. Potato do not reproduce by sexual reproduction which requires seeds. 
  • Potatoes are mainly propagated by vegetative methods (cloning). Potato tubers have nodes or eyes from which the new growth begins. The new stems growing from each eye are called sprouts which give rise to the new plant.
  • So, the correct answer is 'Potatoes'.