Tag: the leaf

Questions Related to the leaf

In some __, the leaf base may become swollen and is called as __.

biology the leaf plant adaptation and modification leaves leaf modification

  1. monocots, sheathing leaf base

  2. legumes, pulvinus

  3. legumes, sheathing leaf base

  4. monocots, pulvinus

Show answer
Correct Option: B
Explanation:

Some plants are characterized by well-developed pulvini, small swelling at the base of the leaves, on the shoots. These leaves are individually attached, flattened and helically arranged. Pulvinus facilitates growth independent movement and is common in members of Fabaceae family.

So, the correct answer is " legumes, pulvinus ".

Leaves are modified for storage of food in

biology the leaf plant adaptation and modification leaves leaf modification

  1. Tridax

  2. Pea

  3. Onion

  4. Beans

Show answer
Correct Option: C
Explanation:

A) Tridex is the flowering plant that belongs to family Asteraceae.

B) Onion is the modified leaves that become fleshy due to storage of water, mucilage and food materials.
C) Pea and beans are the legume plants that fix atmospheric nitrogen.
So, the correct option is 'Onion'.

The edible portion in a fresh onion comprises-

biology the leaf plant adaptation and modification leaves leaf modification

  1. modified leaves

  2. buds and leaf bases

  3. swollen stem

  4. disc-like stem

Show answer
Correct Option: A
Explanation:

The onion is an underground stem. It is a stem modification thta gets modified to store food. There is a disc-like a stem which makes up e edible part of the onion. It is called a bulb.

So, the correct option is 'disc-like stem'

The tendril of sweet pea plant is modified 

biology the leaf plant adaptation and modification leaves leaf modification

  1. Auxiliary bud

  2. Stipule

  3. Terminal leaflet of compound leaf

  4. Aerial routs

Show answer
Correct Option: C
Explanation:

The tendril of sweet pea is a modification of the terminal leaflet of the leaf into a slender wiry and coiled structure that helps in support of the plant.

So the correct option is 'Terminal leaflet of compound leaf'

Which of following is incorrect for trichomes?

biology the leaf plant adaptation and modification leaves leaf modification

  1. Trichomes are leaf modifications which minimize water loss

  2. Usually multicellular

  3. They may even be secretory

  4. Help in water absorption

Show answer
Correct Option: A
Explanation:

  • Trichomes are the epidermal outgrowths on the vegetative and reproductive parts of the plant. 
  • These are hair-like structures which may be unicellular or multicellular.
  • Some trichomes are secretory in nature and are known as glandular trichomes. For example, tannins, resins, gum etc., are some products secreted by trichomes.
  • Trichomes help in the absorption of water and minerals.
It is not a leaf modification, hence, option A is incorrect. So, the correct answer is 'Trichomes are leaf modifications which minimize water loss'.

Oxygen is returned to the atmosphere mainly by __________.

biology the leaf mechanism of absorption mineral absorption significance of transpiration

  1. burning of fossil fuel

  2. respiration

  3. photosynthesis

  4. fungi

Show answer
Correct Option: C
Explanation:

Photosynthesis is a process that converts $CO _2$ into organic compounds and starch (carbohydrate) using energy from sunlight. $O _2$ is also released during this process.

Oxygen we breathe is obtained from ________

biology the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Respiration

  2. Guttation

  3. Photosynthesis

  4. All of the above

Show answer
Correct Option: C
Explanation:

$CO _{2} + H _{2}O \underset {chlorophyll}{\xrightarrow {light}} sugar + oxygen (O _{2})$
Oxygen is a product of photosynthesis.

Carbohydrates, the most abundant biomolecules on earth are produced by

biology the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Some bacteria, algae and green plants

  2. Fungi, algae and green plants

  3. All bacteria, fungi and algae

  4. Viruses, fungi and bacteria

Show answer
Correct Option: A
Explanation:

Carbohydrate synthesis occurs through photosynthesis Chloroplasts are the green plastids which occur in all the green parts of the plants. They are the actual site of photosynthesis. 

Cyanobacteria and other photosynthetic bacteria do not possess chloroplasts. However, the photosynthetic pigments of these organisms are located on thylakoids which lie freely in the cytoplasm.
The algae also contain the chloroplasts to perform the photosynthesis.
Fungi are either saprophytic, symbiotic or parasitic organisms. Viruses are parasitic.
Hence, the correct answer is 'Some bacteria, algae and green plants'.

Photosynthesis is essential for survival of

biology the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Animals

  2. Plants

  3. Most of the organisms

  4. All of the above

Show answer
Correct Option: D
Explanation:
Photosynthesis is plants taking in water, carbon dioxide, and light to make sugar and oxygen. This is important because all living things need oxygen to survive. All producers make oxygen and sugar for the secondary consumers and then the carnivores eat animals that eat the plants. If there is not enough producers to make the sugar and oxygen that all living things need then all living things will die out. Without producers CO2 couldn't be taken in by the plants to be turned back into oxygen that all animals need for survival. Also, without producers, herbivores wouldn't have anything to eat and they would all die leaving carnivores without food to eat and all life forms wouldn't be on Earth. Photosynthesis happens in the Chloroplast of the plant's organelle, if the Chloroplast wasn't in the plant Photosynthesis couldn't happen. If there was no sunlight for the plant to absorb then Photosynthesis couldn't happen. If living things didn't breathe out CO2 then the plants would die and living things would have no way of getting oxygen. These are the reasons why Photosynthesis is important to plants and all loving things on the planet.

So, the correct option is 'Option D'.

In cereals, which one of the following kinds of leaves plays a key role in the supply of photosynthates to the developing grain?

biology the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Young leaves

  2. Mature leaves

  3. Flag leaves

  4. Scale leaves

Show answer
Correct Option: A