Reproduction in Plants: Class 7 Science Q&A
23 free answers on Reproduction in Plants (Science) for Class 7 students, across CBSE, ICSE and State boards. Includes questions such as “Coconut is a large and heavy fruit. How is it adapted for dispersal by water?”, “Describe the various ways by which seeds are dispersed.”, “How does the process of fertilisation take place in flowers?”
Question & Answer
Questions
- ScienceClass 7CBSE
Write how the following seeds are dispersed. (a) Seeds with wings. (b) Small and light seeds. (c) Seeds with spines/hooks.
Soln: Seeds with wings are dispersed by wind Small and light seeds are dispersed by wind Seeds with spines/hooks are dispersed by animals.
- ScienceClass 7CBSE
Fill in the blanks with the correct terms. The male and female gametes fuse to form a _____(a)______ during the process of _____(b)______. This grows into an _____(c)______ which is enclosed within a seed. After fertilisation the ovules develop into _____(d)______ and the ovary develops into a _____(e)______ .
Soln: The male and female gametes fuse to form a (a) zygote during the process of (b) fertilization. This grows into an (c) embryo which is enclosed within a seed. After fertilisation, the ovules develop into (d) seed and the ovary develops into a (e) fruit.
- ScienceClass 7CBSE
Coconut is a large and heavy fruit. How is it adapted for dispersal by water?
Soln: Coconut fruit has spongy fibers on its surface which make it float in water.
- ScienceClass 7CBSE
When you keep food items like bread and fruits outside for a long time, especially during the rainy season, you will observe a cottony growth on them. (a) What is this growth called? (b) How does growth take place?
Soln: a) It is a bread mold which is a fungus b) Bread mold grows from the spores.
- ScienceClass 7CBSE
One morning, as Paheli strolled in her garden, she noticed many small plants which were not there a week ago. She wondered where they had come from as nobody had planted them there. Explain the reason for the growth of these plants.
Soln: The seeds from the tree may have fallen below and germinated into small plants. The seeds might have been brought to the garden by agents like the wind, which germinated and grew into small plants.
- ScienceClass 7CBSE
Boojho had the following parts of a rose plant – a leaf, roots, a branch, a flower, a bud and pollen grains. Which of them can be used to grow a new rose plant?
Soln: A branch can be used to grow a new rose plant
- ScienceClass 7CBSE
Pick the odd one out from the following on the basis of mode of reproduction and give a reason for it. Sugarcane, Potato, Rice, Rose
Soln: Rice does not reproduce by vegetative propagation whereas the other three plants do. Hence Rice is the odd one.
- ScienceClass 7CBSE
Fungus, moss and fern reproduce by a common method of asexual reproduction. Name the method.
Soln: Fungus, moss and fern reproduce by spore formation.
- ScienceClass 7CBSE
Pollination refers to the (a) transfer of pollen from the anther to the ovary. (b) transfer of male gametes from the anther to stigma. (c) transfer of pollen from the anther to stigma. (d) transfer of pollen from the anther to the ovule.
Soln: The answer is (c) transfer of pollen from the anther to stigma. Explanation: The transfer of pollen grains from the anther to the stigma is called pollination. Pollen grains are immobile, they cannot move by themselves to reach the stigma. An external agent such as wind and insects are required for this.
- ScienceClass 7CBSE
Which of the following statements is/are true for sexual reproduction in plants? (i) Plants are obtained from seeds. (ii) Two plants are always essential. (iii) Fertilisation can occur only after pollination. (iv) Only insects are agents of pollination. Choose from the options given below. (a) (i) and (iii) (b) (i) only (c) (ii) and (iii) (d) (i) and (iv)
Soln: Answer is (a) (i) and (iii) Explanation: For sexual reproduction in plants occurs within a plant hence option ii) is wrong. Pollination is carried by various agents such as wind, insects and animals hence option iv) is wrong.
- ScienceClass 7CBSE
The ovaries of different flowers may contain (a) only one ovule (b) many ovules (c) one to many ovules (d) only two ovules
Soln: The answer is (c) one to many ovules
- ScienceClass 7CBSE
The ‘eye’ of the potato plant is what (a) the root is to any plant. (b) the bud is to a flower. (c) the bud is to Bryophyllum leaf. (d) the anther is to stamen
Soln: The answer is (c) the bud is to Bryophyllum leaf. Explanation: Eye of the potato is the vegetative bud which arises from nodes of stem tuber. Just like potato, bryophyllum leaf has vegetative buds.
- ScienceClass 7CBSE
Seeds of drumstick and maple are carried to long distances by wind because they possess (a) winged seeds (b) large and hairy seeds (c) long and ridged fruits (d) spiny seeds
Soln: The answer is (a) winged seeds Explanation: Seeds of drumstick and maple have wings which help them to be easily carried away by the wind. Various seeds and fruits have some special feature due to which they are carried away in a particular way (by wind, water or animal).
- ScienceClass 7CBSE
Lila observed that a pond with clear water was covered up with green algae within a week. By which method of reproduction did the algae spread so rapidly? (a) Budding (b) Sexual reproduction (c) Fragmentation (d) Pollination
Soln: The answer is (c) Fragmentation Explanation: An alga breaks up into two or more fragments. These fragments or pieces grow into new individuals. This process continues and they cover a large area in a short period of time.
- ScienceClass 7CBSE
Which of the following parts of a plant take part in sexual reproduction? (i) Flower (ii) Seed (iii) Fruit (iv) Branch Choose the correct answer from below. (a) (i) and (ii) (b) (i), (ii) and (iii) (c) (iii) and (iv) (d) (ii), (iii) and (iv)
Soln: Answer is (b) (i), (ii) and (iii) Explanation: Functions of sexual reproduction are carried out by flowers. After fertilization, the ovaries grow into fruits and seeds develop from ovules.
- ScienceClass 7CBSE
Tick the correct answer: (a) The reproductive part of a plant is the (i) leaf (ii) stem (iii) root (iv) flower (b) The process of fusion of the male and the female gametes is called (i) fertilisation (ii) pollination (iii) reproduction (iv) seed formation (c) Mature ovary forms the (i) seed (ii) stamen (iii) pistil (iv) fruit (d) A spore-producing organism is (i) rose (ii) bread mould (iii) potato (iv) ginger (e) Bryophyllum can reproduce by its (i) stem (ii) leaves (iii) roots (iv) flower
Solution: a) (iv) flower b) (i) fertilization c) (iv) fruit d) (ii) bread mould e) (ii) leaves
- ScienceClass 7CBSE
Match items in Column I with those in Column II: Column I Column II Column-I Column-II (a) Bud (i) Maple (b) Eyes (ii) Spirogyra (c) Fragmentation (iii) Yeast (d) Wings (iv) Bread mould (e) Spores (v) Potato (vi) Rose
Solution: Column-I Column-II (a) Bud (iii) Yeast (b) Eyes (v) Potato (c) Fragmentation (ii) Spirogyra (d) Wings (i) Maple <p
- ScienceClass 7CBSE
Describe the various ways by which seeds are dispersed.
Seeds and fruits of plants are carried away by the wind, water and animals. Winged seeds such as those of drumstick and maple, light seeds of grasses or hairy seeds of aak (Madar) and hairy fruit of the sunflower get blown off with the wind to faraway places. Some seeds are dispersed by water. These fruits or seeds usually develop floating ability in the form of a spongy or fibrous outer coat as in coconut. Some seeds are dispersed by animals, especially spiny seeds with hooks which get attac
- ScienceClass 7CBSE
How does the process of fertilisation take place in flowers?
Solution: The process of fusion of male and female gametes (to form a zygote) is called fertilisation. The zygote develops into an embryo, and the embryo undergoes mitotic cell division to form seeds.
- ScienceClass 7CBSE
State the main difference between asexual and sexual reproduction.
Solution: Asexual reproduction Sexual reproduction It requires only one parent Requires a male and female parent Daughter cells formed are identical to parents and to each other. Newly formed offsprings show variations in comparison to the parents. </tr