In this page we have Extra Questions for Class 6 Science Chapter 7 Getting to know plants . Hope you like them and do not forget to like , social share
and comment at the end of the page.
Short Answer questions
Question 1 GIVE REASONS FOR THE FOLLOWINGS.
(i)Why plants like cactus develop spines?
(ii)‘Transpiration do not take place at night’.
(iii)Why leaves are green in colour?
(iv)‘Tap root is also known as true roots’
(v)Mango is known as a tree and not as shrub.
Answer
(i) To reduce the loss of water by transpiration as they grow in areas of water scarcity like deserts.
(ii)At night stomata remains closed
There is no sunlight
(iii)They contain a green colour pigment known as chlorophyll.
(iv)A single root( called the primary root) comes out from the seed after germination hence it is also known as true roots.
(v)Mango has a strong ,hard & thick stem, They have branches arising from upper part of the stem, unlike shrubs.
Question 2 HOTS
(i)Why complete flowers are also known as bisexual flower?
(ii)How do you think a huge banyan tree gets its support?
(iii)Why stems are modified in cactus?
(iv)Why do desert plants have relatively longer roots?
(v)Why grapes have tendrils?
Answer
(i)Complete flowers have all four whorls like sepals, petals, stamen, pistil. As it has both male & female reproductive structures, hence it is also called bisexual flower.
(ii)Banyan tree have extra roots known as prop roots which come out from their branches & grow downwards to give them extra support.
(iii)Since leaves are reduced in cactus as spines, stems are modified to carry out the process of photosynthesis.
(iv)To penetrate deep inside the soil in search of water.
(v)Ans: Since they have weak stem, they need a structure to climb up a support which is provided by the tendrils.
SKILL/DIAGRAM-BASED QUESTIONS.
Question 3
(i). Name the parts labeled a-f
(ii). state the function of ‘c’
(iii). Is it a complete or incomplete flower?
Answer
(i)
a- Stigma
b- anther
c- petals
d- ovary
e- sepals
f- ovules
(ii)Petals- as it is colorful it attracts insects, which helps in pollination.
(iii)It is a complete flower.
Question 4
(i)Identify the structure shown.
(ii)What is the other name used for this structure?
(iii)State the significance of this structure.
(iv)Where are these structures found?
(v)Is it a modified root or shoot?
Answer
(i))Pneumatophores
(ii)Breathing roots
(iii)Helps in breathing of plants.
(iv)Mangroves forest like Sundarbans.
(v)It is a modified root.
Question 5
Identify the process shown.
Name the process labelled A, B, C.
List two agents that favours this process.
LONG ANSWER TYPE QUESTION.
Question 6
(i)How do plants like Dodder obtain its nutrition?
(ii)What role does modified root in asparagus play?
(iii)Apart from the above mentioned modified functions of root state any two other functions of root?
Answer
(i)For nutrition plant like Dodder have specialized roots called parasitic root arising from their stem, which help them to absorb water & nutrients from the host.
(ii)For multiplication, roots of asparagus can develop into new plants.
(iii)Roots help to anchor the plant firmly into the ground, they help plants to absorb water and nutrients from the soil. Roots also prevent soil erosion.
Question 7
List the different functions of stem.
Answer
It holds leaves in position and helps them to spread out.
It bears flowers buds, leaves & fruits
It conducts water and mineral salts from the root to the leaves & other part of the plant.
It carries the food manufactured by the leaves to the other part of the plant.
Stems of plants like cactus swell up to store water in them& also perform photosynthesis.
For protection stems may be modified as thorns like in bougainvillea or as sharp prickles as in rose.
Stems of climbers like grapes are modified into tendrils to climb a support.
For storage of food we have many modified stems like potato tubers. Rhizomes of ginger and bulb of onion.
Stem cuttings of some plants like rose ,jasmine grow into new plants.
