Class 6 Science Chapter 4 Practice Question Answers - Getting to Know Plants

Q1: Mention the part of the plant which produces food. Name this process.
Ans: The leaf is the part of the plant which produces food. The process of producing food by leaf is called photosynthesis.

Q2: Name two flowers, each with joined and separated sepals.
Ans: Flowers with joined sepals:
(i) Datura
(ii) Cotton
Flowers with separate sepals:
(i) Rose
(ii) Mustard

Q3: Name two plants that belong to herbs.
Ans: Two plants that belong to herbs are:

• Wheat
• Tomato

Q4: What are shrubs?
Ans: Medium-sized plants known as shrubs have branched stems that are bushy and hard but not particularly thick. Near the base, their stem branches out. Examples of shrubs are jasmine rose, lemon, henna, etc.

Q5: What is root? List the main functions of the root.
Ans: Water and minerals are taken up by the roots and transported to the stems. They serve as a plant’s support system, food storage, and anchor.
The main functions of the root are:

• Roots absorb water and nutrients from the soil.
• It anchors the plant to the soil.
• It conducts absorbed water and nutrients to stem
• It helps in the storage of food
• It helps the plant to stand erect.

Q6: Of the following plants, which of them have flowers?
Grass, maize, wheat, chilli, tomato, tulsi, peepal, shisham, banyan, mango, Jamun, guava, pomegranate, papaya, banana, lemon, sugarcane, potato, and groundnut.
Ans: All the plants listed above produce flowers.

Q7: Mention the green pigment present in the leaves of a plant.
Ans: Chlorophyll is the green pigment present in the leaves of a plant.

Q8: Find out the wrong statements and correct them.
(a) The visible parts of a bud are the petals.
(b) Anther is a part of the pistil.
(c) Leaves perform the function of transpiration only.
Ans: (a) Wrong: The visible parts of a bud are the sepals.
(b) Wrong: Anther is a part of the stamen.
(c) Wrong: Leaves perform transpiration and other functions, including photosynthesis, gaseous exchange through stomata, etc.

Q9: Name the three types of plants.
Ans: The three types of plants are:

• Herbs
• Shrubs
• Trees

Q10: Boojho wanted to identify the presence of starch in leaves. He did the following steps given below.
(1) He put a leaf in water and boiled it.
(2) He placed the leaf in a petri dish and poured some iodine over it.
He did not get the expected result. Which step did he miss? Explain.
Ans: To eliminate chlorophyll and reveal the leaf’s natural green colour, the leaf must first be boiled in water before being heated in alcohol. Boojho failed to remove the chlorophyll from the leaf by boiling it in spirit (alcohol); hence he did not achieve the desired outcome (i.e. change in colour of the leaf).

Q11: Name one plant which has reticulate venation.
Ans: Marigold

Q12: Is it possible to compare a plant’s stem to two-way traffic? Give reason(s).
Ans: Yes. This is because food goes downward in the stem while water and minerals move upward. The stem transports minerals and water from the plant’s root to its leaves and other sections (upward). The food that the leaves prepare passes through the stem and is stored in various locations (downward).

Q13: Which of the following below is not the primary function of the stem?
(a) Bears flowers and fruits
(b) Photosynthesis
(c) Conduction of water
(d) Formation of branches
Ans: (b)
Photosynthesis is the primary function of the leaf and not the function of the stem.

Q14: Read the following sentences about photosynthesis and choose the right pair of sentences that are true to photosynthesis.
(i) Sunlight, chlorophyll, carbon dioxide and water are necessary.
(ii) Oxygen is absorbed.
(iii) Leaves carry out photosynthesis.
(iv) Proteins are made during photosynthesis.
(a) (iii) and (iv)
(b) (i) and (iii)
(c) (ii) and (iv)
(d) (i) and (iv)
Ans: (b)
Oxygen is released during photosynthesis. Carbohydrates are made during photosynthesis, not proteins.

Q15: Which of the following given below is not a correct match?
(a) Lamina: flat green part of a leaf
(b) Petiole: attaches the leaf to stem
(c) Veins: transpiration
(d) Margin: gives shape to the leaf
Ans: (c)
Veins support the leaf and transport water, minerals, and food in the leaf.

Q16: What are climbers?
Ans: Climbers are plants that use the support of surrounding structures to ascend. Their stem is fragile.

Q17: Demonstrate an activity to show that the stem conducts water and other substances.
Ans: Activity to show that stem conducts water and other substances:

• Fill a glass with water.
• Drop some red ink into the water.
• Cut the herb plant’s stem at the base.
• Put it in the glass.
• We will observe that the stem turns red in some areas.
• This activity shows that the stem conducts water.

Q18: If a plant has fibrous roots, what type of venation do its leaves have?
Ans: The leaves should have parallel venation. Examples of parallel venation are wheat, grass, maize etc.

Q19: What are the functions of leaves?
Ans: The functions of leaves are:

• Through the process of photosynthesis, the leaves prepare food for the plant.
• In plants, the respiration process is carried out by the leaves.

Q20: What is lamina?
Ans: The lamina is the flat green part of a leaf specialised for photosynthesis.