Samacheer Kalvi Class 7 Science Term 1 Unit 5 Reproduction and Modification in Plants Solutions
Welcome to NCTB Solutions. Here with this post we are going to help 7th class students by providing Solutions for Samacheer Kalvi Class 7 Science Term 1 Unit 5 Reproduction and Modification in Plants. Here students can easily find all the solutions for Reproduction and Modification in Plants Exercise questions. Also here our Expert Science Teacher’s solved all the questions with easily understandable language with proper guidance so that all the students can understand easily. Here on this post students will get Unit 5 exercise solutions. Here all the solutions are based on Tamil Nadu State Board latest syllabus.
Unit 5 Reproduction and Modification in Plants Exercise Questions Solutions :
(I) Choose the appropriate answer :
(1) Vegetative propagation by leaves takes place in
(a) bryophyllum
(b) fungi
(c) virus
(d) bacteria
Answer :
Correct Option → (a)
Vegetative propagation by leaves takes place in Bryophyllum.
(2) Asexual reproduction in yeast is
(a) spore formation
(b) fragmentation
(c) pollination
(d) budding
Answer :
Correct Option → (d)
A sexual reproduction in yeast is Budding.
(3) Reproductive part of a plant is
(a) root
(b) stem
(c) leaf
(d) flower
Answer :
Correct Option → (d)
Reproductive part of a plant is Flower.
(4) Pollinators are
(a) wind
(b) water
(c) insect
(d) All the above
Answer :
Correct Option → (d)
All the above are Pollinators.
(5) Climbing roots are seen in
(a) betel
(b) black pepper
(c) Both of them
(d) None of them
Answer :
Correct Option → (c)
Both betel and black pepper roots can be seen climbing.
(II) Fill in the blanks :
(1) The male reproductive part of a flower is ___
(2) ___ is the basal swollen part of the gynoecium.
(3) After fertilization the ovule becomes ___
(4) Breathing roots are seen in ____ plants.
(5) Onion and garlic are example for ___
Answer :
(1) → Androecium.
(2) → Ovary
(3) → Seed
(4) → Mangrove
(5) → Bulb
(III) State true or false. If false, correct the statement.
(1) A complete flower has four whorls.
(2) The transfer of pollen to the stigma is known as pollination.
(3) Conical shaped root is carrot.
(4) Ginger is an underground root.
(5) Leaves of aloe vera are fleshy and store water.
Answer :
(1) → True
(2) → True
(3) → True
(4) → False
(5) → True
(V) Answer very briefly :
(1) Write two types of reproduction in plants.
Answer :
Plants reproduce through seeds and also reproduce through cutting.
(2) What are the two important parts of a flower?
Answer :
Androecium and Gynoecium are ywo important parts of a flower.
(3) Define Pollination
Answer :
Pollination is a transfer of pollen grains from the anther to stigma.
(4) What are the agents of pollination?
Answer :
Water, Wind, Insects, Animals are the agents of pollination.
(5) Give example for Corm and Tuber
Answer :
Example for Corm – Colocasia
Example for Tuber – Potato
(6) What is tendril?
Answer :
The leaf of plant would be modified into elongated structure to help the plants climb efficiently is called tendril.
(7) What are thorns?
Answer :
Thorns are modified branches or stems.
(VI) Answer briefly :
(1) Differentiate bisexual flower from unisexual flower?
Answer :
- Bisexual flower :
(i) It contain both male and female reproductive organs in same flower.
(ii) In this a single flower contains anthers and ovary.
(iii) Called complete flowers
- Unisexual flower :
(i) It contains both male and female reproductive organs in separate flowers.
(ii) Male flowers contain stamen and female flowers contain pistils
(iii) Called incomplete flowers.
(2) What is cross pollination?
Answer :
As we know that when the pollen grains are transferred from the anther of one flower to the stigma of another flower of the same or different kind of plants.
(3) Write notes on phyllode.
Answer :
Phyllode is a modification of leaf they carry out the function of photosynthesis. In which acacia auriculiformis, petioles expand to form leaf like structure.
(VII) Answer in detail :
(1) Write a brief account on pollination.
Answer :
Pollination :
As we know pollination is the process where the transfer of pollen grains from one the anther to the stigma.
Pollination are two types:
(a) Cross- pollination.
(b) Self- pollination.
Cross-pollination:
When the pollen grains are transferred from the anther of one flower to the stigma of the another flower of the same or different kind of plants.
Self- pollination:
When the pollen grains are transferred from the anther to stigma of the same or another flowers of same plants.
(2) Explain the underground stems.
Answer :
Underground stems : Undergrounds stems are those type of stems who grows under the ground to store food and there stems are swell and thick. Underground stems are four types –
(a) Rhizome
(b) Corm
(c) Tuber
(d) Bulb
Rhizome : It’s a that type of underground stem whose stems are thick with nodes and internodes and there is scale leaves at the node and also it grows horizontally and also has an irregular shape. Example : Turmeric, Ginger
Corm : It’s a that type of underground stem whose stem is round in shape and also flat at the top and bottom. Example : Colocasia
Tuber : It’s a that type of underground stem who stores food and it is enlarged, spherical. It has many dormant buds on its surface known as ‘Eyes’ Example : Potato
Bulb : It’s that type of underground stem who have condensed stem and look like disc and also stores food in fleshy leaves. Bulb are two types –
(i) Fleshy leaves
(ii) Scaly leaves
Example : Onion, Garlic
(VIII) Higher Order Questions :
(1) Ginger is considered to be a stem, not a root. Why?
Answer :
As we know that Ginger is Rhizome which is type of underground stem which have thick stem with node and internode and also have scale leaves that’s why it considered to be stem not a root.
(2) What will happen if pollen grain of rose gets deposited on stigma of lily flower? Will pollen germination takes place? Why?
Answer :
As we know that the pollen of a flower are match only with the stigma of a flower of the same plants so the pollen grains of rose are useless if it gets deposited on stigma of lily flower.
(IX) Consider the following statements and choose the correct one :
(1) Assertion : Pollination and fertilization in flowers produce fruits and seeds.
Reason : After fertilization the ovary becomes fruit and ovule becomes seed.
(a) Assertion is incorrect, Reasoning is correct.
(b) Assertion is incorrect, Reasoning is incorrect.
(c) Assertion is correct, Reasoning is correct.
(d) Assertion is correct, Reasoning is incorrect.
Answer :
The answer is option – (a)
Assertion is correct, Reasoning is incorrect, is the correct answer of this question.
(2) Assertion : An example for conical root is carrot.
Reason : It is an adventitious root modification.
(a) Assertion is incorrect, Reasoning is correct.
(b) Assertion is incorrect, Reasoning is incorrect.
(c) Assertion is correct, Reasoning is correct.
(d) Assertion is correct, Reasoning is incorrect.
Answer :
The appropriate answer is option – (a)
Assertion is incorrect, Reasoning is correct, is the correct answer of this question.
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